release: freeze v0.3.12 — version bump, lockfiles, changelog (#1001)

19-issue GitHub sweep: 16 PRs merged since v0.3.11, most fixing reports
filed same-day or in the days prior. Highlights: MLX-Audio's 6 other
curated models are finally selectable (was silently stuck on Kokoro
regardless of what was downloaded), first-run no longer dead-ends behind
restricted networks or corporate TLS-inspecting proxies, dubbing/batch
TTS honor your active engine selection, and a run of sharp community
diagnoses (ROCm wheel index, Windows dictation focus-steal, a genuine
frontend crash regression) got fixed largely because reporters did the
hard diagnostic work themselves.

Full backend suite: 2390 passed, 0 failed. Full frontend suite: 918
passed, 0 failed. Version lockstep (tests/test_app_version.py): 6/6
passed. Docker frozen-lockfile parity (bun install --frozen-lockfile):
clean, no drift.

Co-authored-by: mergetest <test@local>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

.github/FUNDING.yml

@@ -2,6 +2,8 @@
 # GitHub Sponsors isn't set up for this account — fund via Ko-fi or PayPal.
 
 ko_fi: debpalash
-custom: ["https://paypal.me/palashCoder"]
+custom:
+  - "https://paypal.me/palashCoder"
+  - "https://github.com/debpalash/OmniVoice-Studio/blob/main/SPONSORS.md"
 # github: [debpalash]            # not available
 # open_collective: omnivoice-studio

.github/ISSUE_TEMPLATE/sponsor.yml

@@ -0,0 +1,78 @@
+name: 🤝 Sponsorship inquiry
+description: Support OmniVoice and (optionally) claim a logo slot. Not for bugs or feature requests.
+title: "Sponsorship inquiry: "
+labels: ["sponsor"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for considering sponsoring **OmniVoice Studio** 💛
+
+        OmniVoice is free, local-first, and AGPL-3.0 — sponsorship keeps development going.
+        See **[SPONSORS.md](https://github.com/debpalash/OmniVoice-Studio/blob/main/SPONSORS.md)** for tiers, placements, and logo guidelines.
+        Prefer to just donate? [Ko-fi](https://ko-fi.com/debpalash) (recurring) or [PayPal](https://paypal.me/palashCoder) (one-time) — you don't need this form for that.
+  - type: input
+    id: name
+    attributes:
+      label: Name or organization
+      description: How you'd like to be credited (person or company).
+    validations:
+      required: true
+  - type: input
+    id: website
+    attributes:
+      label: Website / link
+      description: The URL your name or logo should link to (homepage, product page, profile…).
+      placeholder: https://example.com
+  - type: input
+    id: logo
+    attributes:
+      label: Logo URL (optional)
+      description: Link to your logo (SVG preferred, else 2× PNG, transparent background). You can also attach it in the description below.
+      placeholder: https://example.com/logo.svg
+  - type: dropdown
+    id: tier
+    attributes:
+      label: Tier you're interested in
+      description: See SPONSORS.md for what each tier includes. Not sure? Pick "Not sure yet".
+      options:
+        - Backer
+        - Bronze
+        - Silver
+        - Gold
+        - Not sure yet — let's talk
+        - Custom / annual arrangement
+    validations:
+      required: true
+  - type: dropdown
+    id: method
+    attributes:
+      label: How you'd like to support
+      options:
+        - Ko-fi (recurring)
+        - Ko-fi (one-time)
+        - PayPal (one-time)
+        - Not sure yet — let's discuss
+    validations:
+      required: true
+  - type: input
+    id: contact
+    attributes:
+      label: How should we reach you?
+      description: Email or another contact. (GitHub will also notify you on this issue.)
+    validations:
+      required: true
+  - type: textarea
+    id: notes
+    attributes:
+      label: Anything else?
+      description: Questions, constraints, timeline, or context. Attach your logo here if you didn't link it above.
+  - type: checkboxes
+    id: ack
+    attributes:
+      label: Acknowledgements
+      options:
+        - label: I understand sponsorship is a thank-you, not a paywall — OmniVoice stays fully free and AGPL-3.0, and sponsors don't get gated features.
+          required: true
+        - label: If I provide a logo, I have the right to use it and grant OmniVoice permission to display it in the README, the app, and the project website.
+          required: false

.github/workflows/ci.yml

@@ -118,9 +118,12 @@ jobs:
         working-directory: frontend
         run: bun run format:check
 
+      # `bun run test` (frontend/package.json), not `bunx vitest` — bunx
+      # resolves by npm package name and can miss workspace-hoisted bins,
+      # then falls back to fetching from npm (#962 class).
       - name: Run Vitest (frontend)
         working-directory: frontend
-        run: bunx vitest run
+        run: bun run test
 
       # Legacy node:test runner for tests/frontend/*.test.mjs
       - name: Run frontend node:test (legacy)

.github/workflows/release.yml

@@ -190,6 +190,14 @@ jobs:
           # backlog that motivated the original drop is contained by
           # fail-fast:false — a slow Intel leg can delay the release run but
           # can't fail the other targets.
+          #
+          # #889 (2026-07): Intel macOS is now UNSUPPORTED for the local
+          # backend — torch ≥2.3 ships no macOS x86_64 wheels, so the venv
+          # bootstrap can never succeed on Intel. The shipped x64 artifact is
+          # effectively UI-only (usable with a remote backend); the app now
+          # pre-fails first-run bootstrap with an honest message on Intel.
+          # Whether to keep shipping this x64 leg (UI-only) or drop it is an
+          # OWNER CALL — deliberately not changed in the #889 PR.
           - os: macos-15-intel
             arch: x86_64-apple-darwin
             label: "macOS Intel"
@@ -516,7 +524,9 @@ jobs:
           # Every other invocation — crucially the `v*` tag-push stable release
           # — evaluates these expressions to exactly their prior values.
           tagName: ${{ (needs.preview-gate.outputs.is_preview == 'true') && 'preview' || github.ref_name }}
-          releaseName: ${{ (needs.preview-gate.outputs.is_preview == 'true') && 'OmniVoice Studio (Preview)' || format('OmniVoice Studio {0}', github.ref_name) }}
+          # Version-first so the tag is readable in GitHub's truncated
+          # release-list sidebar (which clips the title mid-string).
+          releaseName: ${{ (needs.preview-gate.outputs.is_preview == 'true') && 'Preview — OmniVoice Studio' || format('{0} — OmniVoice Studio', github.ref_name) }}
           releaseBody: ${{ steps.changelog.outputs.body }}
           releaseDraft: ${{ (needs.preview-gate.outputs.is_preview == 'true') && 'false' || (inputs.draft || 'true') }}
           prerelease: ${{ needs.preview-gate.outputs.is_preview == 'true' }}

CHANGELOG.md

@@ -8,44 +8,127 @@ The bundled TTS model package (`pyproject.toml`) is versioned independently.
 
 ## [Unreleased]
 
-### Changed
+## [0.3.12] — 2026-07-08
 
-- **The app now always opens maximized (not fullscreen).** Window size and
-  position are no longer carried over from the previous session — one manual
-  resize used to make every later launch reopen at that smaller size,
-  overriding the intended maximized default. Same behavior on macOS
-  (zoomed window, not a fullscreen Space), Windows, and Linux.
+A community-issue sweep — nineteen open reports triaged in one pass, most fixed same-day. The through-line: **your active engine selection is now honored everywhere** (dubbing, batch, and — new in this release — MLX-Audio's own curated models are finally selectable instead of always silently defaulting to Kokoro), **first-run stops dead-ending users on restricted networks or behind corporate TLS proxies**, and a run of sharp community diagnoses (a one-line ROCm index fix, a Windows-only focus-stealing bug, a genuine crash regression) got fixed largely because reporters did the hard diagnostic work themselves. Thank you.
+
+### Added
+
+- **MLX-Audio's other 6 curated models are finally selectable.** The engine multiplexes Kokoro, CSM, Qwen3-TTS, Dia, Chatterbox, MeloTTS, and OuteTTS, but there was no way anywhere in the UI or API to pick which one loads — downloading a model via Settings → Models did nothing, since the backend always defaulted to Kokoro regardless. Settings → Engines now shows a model picker on the mlx-audio row; switching takes effect immediately, no restart needed. (#981)
 
 ### Fixed
 
-- **Confucius4-TTS is now validated end-to-end — and actually loads.** The
-  opt-in engine's first live run (Apple Silicon, CPU) caught three
-  scaffold-era faults: the sidecar could never import `confuciustts` (upstream
-  ships no packaging, so the documented `pip install -e` fails — the sidecar
-  and bootstrap probe now put the clone on `sys.path`, like upstream's own
-  example), the assumed 24 kHz sample rate was wrong (confirmed **22 050 Hz**,
-  now regression-tested), and the docs demanded an Amphion/MaskGCT install
-  that doesn't exist (all weights auto-download from HuggingFace). CPU is
-  ~17× realtime, so CUDA stays the recommended path; `gpu_compat` now
-  advertises `("cuda", "cpu")`. (#590)
+- **First-run no longer dead-ends behind restricted networks (e.g. China).** The system check probed hardcoded huggingface.co, and any failure locked the Continue button — users behind the Great Firewall were stuck on the very first screen, even when they had already configured a working mirror. The check now probes the Hugging Face endpoint actually in effect, an unreachable endpoint is a warning instead of a blocker (models already on disk keep working offline), and when huggingface.co is blocked but the hf-mirror.com community mirror answers, the wizard says so and offers a one-click mirror switch right on the check screen — no restart needed. (#984)
+- **Installs behind a corporate or antivirus TLS-inspecting proxy no longer fail with a raw SSL error.** `SSLV3_ALERT_HANDSHAKE_FAILURE` happens when a proxy re-signs HTTPS traffic with a root CA your OS trusts but Python's bundled certificate list doesn't — a different failure mode from the network-blocking case above. OmniVoice now trusts your OS's certificate store directly, which should resolve the handshake outright rather than just explain it better. (#976)
+- **The loaded-models panel now says when a resident model is not your active engine.** Switching TTS engines keeps the previous model in VRAM (so switching back is instant) — but the panel showed it with no context, so "OmniVoice TTS — 1.9 GB" after selecting VoxCPM2 looked like the selection was ignored. A field report confirmed the confusion. Resident-but-inactive models are now tagged "not active — safe to unload", and the API self-describes each entry's engine. (#985)
+- **Voices no longer ship with a hidden echo.** Every non-raw synthesis was getting a small room reverb baked in by the mastering pre-stage — on top of whatever effect preset you chose, so even "Podcast" (which promises *no reverb*) had some, and Cinematic/Warm got it twice. A field report ("a lot of echo/reverb on some of the voices") led straight to it. The mastering stage is now highpass + compressor only; reverb happens only when a preset explicitly declares it. Also documented: cloned voices reproduce the reference clip's room acoustics — dry, close-mic references clone cleanest. (#986)
+- **Your engine selection now actually applies to Dubbing and Batch TTS.** Both hardcoded OmniVoice regardless of what was picked in Settings → Engines — pick VoxCPM2, dub anyway with OmniVoice, no error. Both now resolve the active engine up front; an engine that can't clone from reference audio (KittenTTS, Sherpa-ONNX, Supertonic 3 — fixed preset voices only) fails the job immediately with a clear message naming which engines do support it, instead of silently substituting OmniVoice or mis-cloning every speaker into one voice. Batch only requires cloning when a specific voice is pinned — an unpinned batch job runs on any engine. (#987)
+- **AMD ROCm torch install no longer silently falls back to CPU.** A community member (Kaihui-AMD) diagnosed it precisely: the ROCm wheel index we pointed at tops out at PyTorch 2.5.1, but the app pins `torch==2.8.0` — the reinstall was unsatisfiable and silently kept the default CUDA build, which runs on CPU on an AMD GPU. Bumped the default index to one that actually carries the pinned version. (#972)
+- **mlx-audio no longer crashes on unsupported languages.** Selecting a language like Dutch, Spanish, or Portuguese with mlx-audio's Kokoro model crashed with a raw, unreadable internal-details dump instead of a real error — the code was guessing an ISO language code by truncating the language name, which only worked by coincidence for a few languages. Unsupported languages now fail cleanly with a message naming what's actually supported, and no engine can leak a raw crash-internals dump into an error message again. (#977)
+- **The voice-design panel no longer crashes on certain saved voice profiles.** A genuine regression: an earlier translation fix accidentally introduced a crash when a saved design profile's data was incomplete (possible from an older app version or a partial save). Fixed at every layer — the render no longer crashes, both places that restore saved data complete it first, and profiles can no longer be *saved* with incomplete data in the first place. (#983)
+- **Windows: the dictation pill no longer steals focus.** Pressing the dictation shortcut activated the pill window, which meant the auto-paste landed back in OmniVoice instead of whatever app you were dictating into, and the pill would get stuck on screen. Precisely diagnosed by a community reporter; fixed to match how this already worked on macOS. (#982)
+- **The nemo-parakeet ASR engine's install hint no longer breaks your backend.** Following the in-app "pip install nemo_toolkit[asr]" instruction silently downgraded core packages your backend needs to start — the install reported success, and the breakage only showed up on the next restart. The hint now says plainly that this isn't safe to install into the shared environment. (#974)
+- **A stuck generate now tells you the actual fix.** When a job times out from GPU/VRAM contention, the error explained why but never mentioned Flush/Unload — the one action that actually resolves it, and one the sibling ASR-timeout error already recommended. (#939)
 
-- **Parakeet TDT transcription now works without an NVIDIA GPU.** The
-  `nemo-parakeet` ASR engine (parakeet-tdt-0.6b-v3, 25 languages, word
-  timestamps) was hard-gated behind CUDA — but a live measurement on an Apple
-  Silicon M2 shows it transcribing at ~10× realtime *on CPU*, roughly 20×
-  faster than the default whisper-large-v3 on the same machine at equal
-  accuracy. The false GPU gate is removed, so Mac and CPU-only users can now
-  pick the dramatically faster engine in Settings → Engines.
+### Changed
 
-- **8 GB GPUs: voice-clone/dub transcription no longer kills the backend.**
-  On cards where the TTS model already held most of the VRAM (e.g. RTX
-  4060 Ti 8 GB), loading whisper `large-v3` in float16 for a reference-clip
-  or dub transcription died as a *native* CUDA out-of-memory abort — the
-  whole backend process vanished with no error logged, and the app showed
-  "Can't reach the local OmniVoice backend." A new VRAM preflight re-checks
-  free GPU memory right before the ASR load and steps down float16 →
-  int8 → CPU instead of attempting a load that can't fit (opt-out:
-  `OMNIVOICE_ASR_VRAM_PREFLIGHT=0`). (#723)
+- **README and Linux docs no longer advertise a `.deb` package that isn't published.** `.deb` bundling is disabled in the release pipeline pending a tauri-cli fix; the docs now say so honestly instead of pointing at a file that was never in any release. (#961 investigation, #990)
+- **Linux install docs mention `yt-dlp` as an optional prerequisite** — previously only surfaced via an in-app warning after the fact. (#973)
+- **A benign Tauri startup warning no longer looks like an app problem.** On some Windows configurations, Tauri's own internal IPC fallback logs a warning that's fully harmless (it silently and successfully falls back to another transport) — it was spuriously flipping the Settings → Logs footer to show "1 warning" on every launch. Filtered out of the diagnostic capture. (#975)
+
+## [0.3.11] — 2026-07-05
+
+The multi-language release — dubbing into several languages at once is finally a mature, honest workflow: **"Generate N dubs" now translates each language before rendering it** (with visible per-language progress), **switching languages never destroys your work** (every track keeps its own text, subtitles, and audio cache), completed tracks always show their tabs, and dialogue stops starting seconds early because of footsteps — a community reporter's theory, confirmed exactly. Around it, a reliability sweep driven by same-day field reports: your LLM provider finally survives a restart, SOCKS-proxy users can synthesize again (installed models now load without touching the network at all), timeline boxes are visible on every WebView2 runtime, running from source works again — and when the backend crashes, **it now tells you the exit code and attaches the evidence to your bug report automatically**.
+
+### Added
+
+- **Backend crashes are now self-documenting.** When the local backend process dies (a native GPU abort, an out-of-memory kill), the app used to show only "Can't reach the backend" — undiagnosable without logs nobody sends. The launcher now records every unexpected backend death (exit code, how long it ran, the last 40 log lines), tells you honestly that it *crashed* and is restarting, offers a "View crash details" panel, attaches the evidence to in-app bug reports automatically (paths scrubbed), and stops silent crash-loops after 3 deaths in 10 minutes with the details on screen. Intentional shutdowns, restarts, and app quits are never misreported as crashes. (#969)
+- **"Generate N dubs" now actually translates each language first.** Multi-language generation used to synthesize every track from whatever text was in the editor — so at most one of your N dubs was really in its language. The batch now runs translate → generate per language with a visible "Translating → Bengali (2/3)…" phase, skips (and reports) any language whose translation fails instead of rendering a wrong-language track, and your multi-language picks and export-track selection are saved with the project instead of vanishing on tab switch. (#957)
+- **Switching dub languages no longer destroys your work — every track keeps its own text and audio.** Translations are now stored per language (switching the target swaps the editor text non-destructively; manual edits stay with their language), subtitles export each track's own text instead of N identical files, burned-in subs match their track, and the per-segment audio cache is keyed by language — "Regen changed" can no longer splice another language's audio into the track you're rebuilding, and staleness is tracked per track. Fully backward-compatible: existing projects and caches keep working; a pre-upgrade project's first "Regen changed" simply regenerates cleanly once. (#958)
+
+### Fixed
+
+- **Timeline segment boxes are visible on every WebView2 runtime.** The v0.3.10 flicker fix switched box colors to a newer CSS feature (`color-mix`) applied as an inline style — on WebView2 runtimes older than ~March 2023 (pinned enterprise/offline installs) that renders as *fully transparent*, turning "flickering boxes" into "no boxes at all" while looking perfect on up-to-date machines. Colors are now pre-blended in plain JavaScript to universally-supported `rgb()` values — pixel-identical on modern runtimes, theme-aware, and guarded by a test that fails if an engine-dependent color ever reaches the timeline again. (#968)
+- **Dubbed dialogue stops starting seconds early because of footsteps.** Dialogue starts are snapped to the first detected sound — and a single 20 ms burst (footsteps, a door, a sigh) counted as "speech", with no limit on how far a start could jump, and the snap even ran on the raw mix when vocal separation had failed. Onsets now require sustained speech-like energy, long jumps are only allowed across genuinely silent spans (so the original fix for whisper's stretched starts keeps working), and snapping turns off entirely when vocals weren't separated. Credit to the community reporter whose "footsteps theory" was exactly right. (#967)
+- **Completed dub tracks always show their video tabs.** Opening a project with a finished dubbed track hid the Original/track switcher until you re-selected the language — visibility was keyed to the language dropdown instead of the project's tracks, and restored projects couldn't set the language because the history database froze it at empty forever. Tabs now render from the tracks themselves, history keeps its language (existing projects heal without migration), restoring a project can no longer 404 the video preview, and track pills gained duration/timing tooltips plus an accurate now-playing indicator. (#956)
+- **Running from source works again, and the install docs stop lying.** `bun run desktop-prod` broke when the frontend became a workspace (`bunx` could fetch the wrong "tauri" package from npm — fixed everywhere including CI); the Linux white-screen guidance now leads with the variable that actually fixes modern Ubuntu (`WEBKIT_DISABLE_DMABUF_RENDERER=1`, with the exact `EGL_BAD_PARAMETER` error quoted); Windows docs now state plainly that GPU acceleration is NVIDIA-only there; the Linux docs document the ROCm support that already shipped (the "planned follow-up" note was stale); and prerequisites are split installer-vs-source with git and curl included. (#964)
+- **Your LLM provider now survives a restart.** Setting up Ollama (or any provider), testing it, and saving looked like it worked — then a restart forgot the selection: only the separate "Save & use for translation" button ever persisted it, and a leftover setting from the retired (≤0.3.7) translation panel could silently steal the choice back to "Custom" on every launch. An explicit save now activates the provider when none was chosen yet, the leftover legacy settings are migrated into the Custom provider once and removed, and the panel says "Saved — not yet used for translation" instead of staying silent when your edit isn't the active provider. (#965)
+- **SOCKS-proxy users can synthesize again — and an installed model can never again be blocked by a broken network stack.** With a system-wide SOCKS proxy set, clicking Synthesize 500'd with a raw "socksio not installed" error: loading an already-downloaded model still constructed a network session first, which failed at creation. The app now ships SOCKS support (including in the packaged installers), resolves installed models **cache-first** (no network session when the files are already on disk — the local-first guarantee at the loader level), warms up at startup even when the online check fails, degrades LLM extras instead of crashing on proxy errors, and classifies the error with an actionable hint if it ever does surface. (#966)
+
+## [0.3.10] — 2026-07-05
+
+The listening release — nine fixes in twenty-four hours, almost all driven by your v0.3.9 field reports (several with same-day turnaround). The dubbing pipeline stops lying: **Cinematic and Autofit can no longer invent dialogue**, the **speaker count you set is honored on every path** (and auto-cloning stops fabricating voices from guessed labels), and the timeline stops flashing invisible on Windows. Audiobook chapters with pauses render again. And one fix everyone should want: **updating can no longer leave you secretly running the old version** — a leftover backend from a previous install holding the port is now detected and replaced at launch. Plus: the Dub tab's LLM engine finally runs on the provider you configured in Settings, history timestamps stop reading "20617d ago", and the Engines page can't crash under concurrent load.
+
+### Fixed
+
+- **Audiobook/Stories chapters with a `[pause]` no longer fail to render.** Pause spans were built as 1-D silence while every TTS engine returns 2-D audio, so the chapter concatenation crashed with `Tensors must have same number of dimensions` — any chapter containing a pause failed on every attempt (reported with a precise trace in #897). Silence now matches the rendered audio's shape at the source, and the chunk concatenator defensively normalizes mixed ranks (including honest mono→stereo broadcast) so no engine can re-trigger the class. (#953)
+- **Cinematic and Autofit dubbing can no longer invent dialogue.** The refine and slot-fit passes accepted any non-empty LLM reply for Latin-script languages — hallucinated lines, refusals, or the critique itself could ship as the dub. Every reply is now checked against the original line (length window, target script, critique echo — tunable via `OMNIVOICE_REFINE_RATIO_MIN/MAX`), rejected output falls back to the literal translation with an `adapt-diverged`/`fit-diverged` marker, lines too short to honestly fill their slot skip LLM expansion entirely, and both passes pin `temperature=0.2` like the Fast path. (#950)
+- **Dub timeline boxes can no longer flash invisible during playback.** On some Windows GPU/WebView2 driver combos the segment boxes under the video vanished and reappeared while playing (first reported in #373; the earlier fix was incomplete) — the timeline lane still animated a CSS transform every playback tick, keeping the translucent boxes on a composited layer that the driver mis-painted. Boxes are now positioned in pure layout with fully opaque theme-aware fills (pixel-identical colors), removing the glitch class on every platform. (#951)
+- **The dub "Speakers" count now actually does something — on every path.** The hint only reached pyannote; the common fallbacks silently ignored it (the no-diarization heuristic was hardcoded to alternate two speakers, and the FunASR shortcut never consulted it). The heuristic now cycles the requested count, an explicit count routes through pyannote when available, every path that can only approximate (or must ignore) the setting says so in a visible warning, and the legacy endpoint + a new CLI `--speakers` flag accept it too. Auto voice-cloning also stops fabricating voices from guessed labels: reference slices under 1.5s are rejected, slices bordering another speaker's turn are avoided, and cloning is skipped with an honest warning when speaker labels came from the gap heuristic instead of real diarization. (#952)
+- **Settings → Engines can no longer 500 under concurrent loads.** The lazy TTS/ASR engine registries held a *live* dictionary iterator open across each engine's `is_available()` probe while `list_backends()` ran in a FastAPI threadpool — so a second concurrent `/engines` request materializing a lazy engine entry (`self[key] = cls`) mutated the dict mid-iteration and crashed the request with `RuntimeError: dictionary changed size during iteration`. Both registries now snapshot their keys before iterating (atomic under the GIL), immune to a concurrent insert; regression-tested for TTS and ASR. (#940)
+- **The Dub tab's LLM translation engine now runs on your configured LLM provider.** Picking "LLM (OpenAI-compatible)" silently required three hand-set environment variables even when a provider was already configured and tested in Settings → LLM Providers; it now resolves through a new "Dub translation" LLM skill (route it to any provider — remote or local — in Settings → LLM Skills, independently of Cinematic refinement), keeps the `TRANSLATE_*` env vars as a power-user override, bounds every call with the LLM timeout instead of the SDK's 600-second default, tells the Engine dropdown whether the engine is actually ready (and via which provider), and — when nothing is configured — returns a clear pointer to Settings → LLM Providers instead of a raw 401 per segment. (#944)
+- **Timestamps no longer show "20617d ago" in OmniDrive/Projects.** The backend stores record times in Unix seconds while some views assumed milliseconds, so generation-history cards rendered as ~1970 ("20617d ago") and sorted last; every relative-time label (OmniDrive, sidebar history, dub projects, batch queue, transcriptions) now goes through one unit-tolerant formatter, and records missing a timestamp show "—" instead of an epoch age.
+- **Updating can no longer leave you secretly running the old version.** If a backend from a previous version was still holding the port (an orphan that survived an update), the new app "attached" to it because it answered health checks — so every fix in the update appeared to change nothing (the reported "bound port blocked the newer version"). The launcher now compares the running backend's version against the app before attaching: same version attaches as before, a stale one is killed and the bundled backend is started in its place — on macOS, Windows, and Linux. (#947)
+
+## [0.3.9] — 2026-07-04
+
+The dictation release — and a deep reliability pass driven by live-testing the entire app. **Dictation is rebuilt end-to-end**: instant feedback with a live waveform, words that commit about half a second after you stop speaking, clean punctuation, and text insertion that never lies about success. **LLM providers get one-click connection testing** with real diagnostics and model discovery, in all 21 languages. The app now **always opens maximized**, bottom buttons **can't hide under the footer** at small window sizes, and a wave of "out of memory / can't reach the backend / stuck at preparing" reports were traced to their real causes and fixed — including the silent VRAM crash on 8 GB cards, dead-IPC startup hangs after a Windows BSOD, and misleading error labels. Intel-Mac support status is now stated honestly, Confucius4-TTS is validated end-to-end, and Parakeet — roughly 20× faster than the default transcriber on CPU — is unlocked for every machine.
+
+### Added
+
+- **Sponsor OmniVoice.** A new `SPONSORS.md` (tiers, logo guidelines, how to sponsor), a README Sponsors section, and an in-app Sponsors area (Support page + a footer link) let people back the project — with a one-click "Become a sponsor" that opens a structured GitHub issue form, no account or token needed. Sponsorship is a thank-you, not a paywall: OmniVoice stays free and AGPL-3.0. (#923, #924)
+- **OpenAPI reference in Settings.** A new Settings → OpenAPI page embeds an interactive Scalar reference for OmniVoice's local backend API, with a one-click footer button. Fully local — Scalar is bundled, not loaded from a CDN, and phones home to nothing. (#928)
+- **Engine Self-test.** The Engines matrix gains a "Self-test" button for in-process TTS engines that runs a tiny real synthesis and reports duration + sample rate — proving an engine actually makes audio, not just imports — plus a copy-paste `export OMNIVOICE_*_DIR=…` setup line for opt-in engines right in the "Why unavailable?" panel. (#930)
+- **One canonical HuggingFace-token store + incomplete-download visibility.** The Model Store token field now saves to and is cleared from the same encrypted store as Settings → Credentials (no more two-stores split), and a truncated model cache shows an "incomplete · N MB" state with one-click Repair and Delete instead of masquerading as "not installed". (#927)
+- **Launchpad, reimagined as a deck of cards.** The seven feature cards now fan out with animated waveform faces in each card's accent color; hover or keyboard-focus any card and it comes forward while the rest tuck underneath, and the layout stays usable down to the minimum window size. (#904)
+- **See exactly what OmniVoice keeps on disk — and get warned before space runs out.** Settings → Storage shows real usage for the model cache (with your largest models), app data, engine environments and temp files, plus a free-space gauge and low-disk / near-full-volume warnings with one-click paths to open folders or reclaim space. (#906)
+- **A "What's new" changelog reader in Settings → Updates.** The available update's real release notes now render in-app, alongside an offline changelog viewer and a one-time "what's new" note after each update. (#909)
+- **Route each AI feature to its own LLM — or switch it off.** A new Settings → LLM Skills panel lists every LLM-powered capability (Cinematic/Autofit translation, slot fitting, glossary auto-extract, direction parsing, dictation cleanup) with a per-skill toggle and provider picker, so sensitive work can stay on a local model while heavier jobs use a remote one. Disabled skills fall back to the exact non-LLM behavior. (#912)
+- **A small thank-you moment, done right.** After a successful export, dub, audiobook, or batch run, OmniVoice may — rarely — show a friendly, dismissible note by the footer heart about supporting development: never more than once a session, at most every 7 days, never for brand-new users, with a permanent "don't ask again". The logs bar also gained an icon and the footer icons now share one size. (#898)
+
+- **Dictation, rebuilt.** The dictation pill now shows a live waveform the moment the mic opens, streams words as you speak with real download/loading progress on first use, and finishes what you say in about half a second of silence instead of two-and-a-half. Transcripts come out properly capitalized and punctuated. Text insertion is now honest and safe: your clipboard is preserved and restored, failures show what to do (including a one-click jump to macOS Accessibility settings when permission is missing) instead of a false "Pasted", and Esc cancels cleanly at any point. The dictation model also pre-warms in the background after launch, so the first press of the hotkey no longer sits on a cold model load.
+
+- **LLM Providers: one-click connection testing with real diagnostics.** The Test button in Settings → LLM Providers now measures round-trip latency and turns failures into plain-language guidance — bad key (401/403), wrong model or URL (404), rate-limited (429), or unreachable server — instead of a raw exception dump. A new "Fetch models" button lists every model your key can access so you pick from real names instead of guessing. The whole panel is now translated into all 21 languages, provider error messages never echo your API key, and the settings API gained full test coverage.
+
+### Changed
+
+- **A "Get in touch" page that actually guides you.** The Contact page is now clearly-labelled cards (report a bug, request a feature, get community help, support the project, report a security issue) with a sentence each on when to use them, instead of a flat link list. (#925)
+- **Release titles are version-first.** GitHub's release-list sidebar truncates the title, so "OmniVoice Studio v0.3.8" hid the version; releases are now named "vX.Y.Z — OmniVoice Studio" so the version is always visible. (#922)
+- **Launchpad feature cards now fill the window.** The seven cards (Voice Clone, Voice Design, Video Dubbing, Stories, Audiobook, Voice Gallery, Transcripts) span the full content width on a maximized display instead of a fixed ~780px fan, and reflow responsively (7→3→1 columns) down to the 900×600 minimum — driven by the shell's own width, keeping the animated card faces, hover/keyboard-focus raise, and reduced-motion fallback. (#915)
+- **LLM Providers settings, de-confused.** The old inline "LLM endpoint" box in Translation is gone — LLM Providers is now the one place that owns it. Fields pinned by an environment variable are shown disabled with an explainer instead of silently reverting, the make-active button explains when a provider is env-pinned, and the Cloudflare Account ID is remembered and editable. (#907)
+- **Intel Macs: honestly unsupported for the local backend.** PyTorch no longer ships Intel-Mac builds, so the backend cannot run there; instead of a cryptic dependency error, Intel users now get a clear explanation up front (with the remote-backend option), and the README/docs say so plainly. (#889, #891)
+
+- **The app now always opens maximized (not fullscreen).** Window size and position are no longer carried over from the previous session — one manual resize used to make every later launch reopen at that smaller size, overriding the intended maximized default. Same behavior on macOS (zoomed window, not a fullscreen Space), Windows, and Linux.
+
+### Fixed
+
+- **Sherpa-ONNX "model not set" now reads as a setup problem, not out-of-memory.** Selecting the sherpa-onnx engine without `OMNIVOICE_SHERPA_MODEL` configured used to fail with a misleading "ran out of memory — press Flush" 500; it now names the exact variable, points at Settings → Engines, and the engine is marked unavailable-with-a-reason in the picker (with a copy-paste setup line) instead of selectable-but-broken. Generalized so any env-gated engine surfaces actionable setup guidance. (#919)
+- **Cinematic & Autofit now actually run on every translation engine.** Picking Cinematic or Autofit on the default Argos engine (or NLLB) used to silently fall back to Fast with a success toast; it now runs the full LLM refine + fit pass, the Autofit fit pass is bounded by the same wall-clock budget as Cinematic, and provider errors are scrubbed of keys/user-ids. (#910)
+- **Dictation no longer freezes on a slow or dead LLM.** Transcript refinement is now hard-bounded (default 4s): a placeholder key or unreachable endpoint falls back to clean unrefined text instead of stalling the paste ~51 seconds. The dictation model is genuinely pre-warmed and reused across sessions, REST transcription is polished like live dictation, and Settings flags a configured-but-failing LLM. (#911)
+- **Model installs fail loudly, not silently.** Failed downloads keep their mirror-aware reason on the row with Retry/Dismiss instead of vanishing after a moment; installs check free disk space up front before overrunning it; in-progress installs get a Cancel button; and the HF-mirror setting only asks for a restart when it actually changed. (#908)
+- **Engines settings, sharper and honest.** The Supertonic license "Accept" button works again (it was inert since it shipped), the engine matrix refreshes the instant you pick an engine, picking a GPU engine that lands on CPU now warns you with the reason, CPU-only engines stop being mislabelled "CPU fallback", and an in-process "Test engine" pass reads as a dependency check instead of a fake "0 ms" latency. (#905)
+- **Updates can no longer cost you data.** Before any database migration runs on first launch of a new version, the database is snapshotted next to itself (newest three kept), and a failed migration stops with the backup path named instead of silently running on a half-upgraded database; the environment self-heal now verifies it's actually broken before rebuilding. (#909)
+- **CUDA transcription now works on packaged NVIDIA installs — the cuDNN 8 compat libraries install automatically at launch.** The install step only existed in the dev-loop `scripts/setup.py`, which isn't bundled into the packaged app, so real installs never got the libs and WhisperX / faster-whisper failed with `Could not locate cudnn_ops_infer64_8.dll`. The Rust bootstrap now side-loads them on CUDA machines; CPU/AMD/ROCm boxes skip the download and cache the result so their launches stay instant. (#827, #869)
+- **`scripts/setup.py` no longer fails with `No module named pip` when installing the cuDNN 8 libs in the dev loop.** `uv venv` doesn't seed pip into the venv, so `python -m pip install` always broke; the script now uses `uv pip install --python` instead. (#869)
+- **Generation timeouts now give device-honest advice.** A CPU-only machine is no longer told the GPU is "VRAM-starved" or to "set the engine to CPU" — CPU hosts get compute-bound guidance (shorter text, the CPU-tuned GGUF/Supertonic-3 engines, the OMNIVOICE_GENERATE_TIMEOUT_S knob) while GPU hosts keep the VRAM-contention explanation. (#896)
+- **Model-download failures now name the mirror that failed.** When a Hugging Face mirror is configured and unreachable, every affected surface (generate, dub, Model Store installs) names the mirror and points at the exact setting instead of leaking a raw network error; auto-repair failures now say *why* the repair failed. (#874, #890)
+- **No more infinite "preparing" after an unclean shutdown.** If Windows corrupts the WebView cache (e.g. after a BSOD), the splash detects the dead IPC channel, proceeds via a direct backend health check, and — if truly stuck — offers a one-click "Repair and restart". (#879, #892)
+- **"Out of memory" is no longer the default excuse.** A failed model download mid-generation was mislabeled as OOM with useless "flush VRAM" advice; network failures are now classified honestly, only real OOM signatures get the OOM treatment, and first-use engine downloads retry once with a fresh connection. (#880, #893)
+- **Hung transcriptions recover the same way everywhere.** Chunked dub transcription now shares the same guarded-timeout + GPU-pool reset as the rest of the app, and repeated timeouts recommend the crash-isolated ASR engine — now properly selectable in Settings. (#730, #895)
+- **A raw `[Errno 22]` transcribe error now tells you what to fix.** When the OS rejects the temporary WAV write during dub transcription (a missing, read-only, or full temp directory, or antivirus interference), the stream used to dead-end as *"Transcription produced no segments. [Errno 22] Invalid argument"* with no next step; it now classifies the EINVAL and appends an actionable temp-dir/disk/AV hint — the same treatment the ffmpeg and compute-type failure classes already get. (#763)
+
+- **Buttons can no longer hide under the logs footer on small windows.** The bottom status/logs bar was a fixed overlay that pages had to compensate for with padding — any view that missed it (voice-card grids in Gallery and Community, bottom action rows) clipped under the bar at small window sizes, a class previously patched one page at a time (#476, #504). The footer is now a real row of the app shell, so content physically ends at its top edge at every window size, collapsed or expanded — guarded by a new layout test plus a 900×600 Playwright check at the app's minimum window size.
+
+- **Confucius4-TTS is now validated end-to-end — and actually loads.** The opt-in engine's first live run (Apple Silicon, CPU) caught three scaffold-era faults: the sidecar could never import `confuciustts` (upstream ships no packaging, so the documented `pip install -e` fails — the sidecar and bootstrap probe now put the clone on `sys.path`, like upstream's own example), the assumed 24 kHz sample rate was wrong (confirmed **22 050 Hz**, now regression-tested), and the docs demanded an Amphion/MaskGCT install that doesn't exist (all weights auto-download from HuggingFace). CPU is ~17× realtime, so CUDA stays the recommended path; `gpu_compat` now advertises `("cuda", "cpu")`. (#590)
+
+- **Parakeet TDT transcription now works without an NVIDIA GPU.** The `nemo-parakeet` ASR engine (parakeet-tdt-0.6b-v3, 25 languages, word timestamps) was hard-gated behind CUDA — but a live measurement on an Apple Silicon M2 shows it transcribing at ~10× realtime *on CPU*, roughly 20× faster than the default whisper-large-v3 on the same machine at equal accuracy. The false GPU gate is removed, so Mac and CPU-only users can now pick the dramatically faster engine in Settings → Engines.
+
+- **8 GB GPUs: voice-clone/dub transcription no longer kills the backend.** On cards where the TTS model already held most of the VRAM (e.g. RTX 4060 Ti 8 GB), loading whisper `large-v3` in float16 for a reference-clip or dub transcription died as a *native* CUDA out-of-memory abort — the whole backend process vanished with no error logged, and the app showed "Can't reach the local OmniVoice backend." A new VRAM preflight re-checks free GPU memory right before the ASR load and steps down float16 → int8 → CPU instead of attempting a load that can't fit (opt-out: `OMNIVOICE_ASR_VRAM_PREFLIGHT=0`). (#723)
+
+### CI
+
+- **A migration can no longer silence the app's logs.** Alembic's startup config was disabling every existing logger process-wide (a latent bug the new pre-migration backup logging exposed); fixed, and the migration-safety tests are now immune to full-suite ordering. (#909, #917)
+- **Deterministically green tests + real install proof.** Tests can no longer read the developer's real `.env` or app data (the order-dependent flake class, #878, #894), and a new cross-platform install-test workflow builds all four installers and proves a real first run — model download plus verified synthesis — on macOS, Windows, and Linux runners.
 
 ## [0.3.8] — 2026-07-01
 

CONTRIBUTING.md

@@ -18,6 +18,7 @@ Thanks for your interest in improving OmniVoice Studio! This guide covers everyt
 ### Prerequisites
 
 - [Git](https://git-scm.com/)
+- `curl` (used by the Bun / uv / rustup install one-liners on macOS and Linux)
 - [Bun](https://bun.sh/) (frontend package manager)
 - [uv](https://docs.astral.sh/uv/) (Python environment manager)
 - [ffmpeg](https://ffmpeg.org/) (audio/video processing)

README.md

@@ -10,6 +10,8 @@
     <a href="#why-ovs">Why OVS</a> ·
     <a href="#tts-engines">TTS Engines</a> ·
     <a href="#asr-engines">ASR Engines</a> ·
+    <a href="#openai-api">API</a> ·
+    <a href="#sponsors">Sponsors</a> ·
     <a href="#sponsor--donate">Donate</a> ·
     <a href="#contributing">Contributing</a> ·
     <a href="https://discord.gg/bzQavDfVV9">Discord</a> ·
@@ -30,11 +32,21 @@
 <br/>
 
 <div align="center">
-  <img src=".github/assets/social-preview.png" alt="OmniVoice Studio — The open-source ElevenLabs alternative" width="100%"/>
+  <img src="docs/screenshot-launchpad.png" alt="OmniVoice Studio — Launchpad" width="100%"/>
+</div>
+
+> **Your voice is the most personal data you have. So why rent it back from a cloud?** Every mainstream voice tool ships your audio to someone else's server and bills you monthly for the privilege. OmniVoice Studio flips that: clone, design, dub, and dictate on your own hardware — 646 languages, no meter running, nothing leaving your machine.
+
+<div align="center">
+
+| 🔑 No API keys | 🙅 No accounts | ☁️ No cloud | 💳 No subscription |
+|:---:|:---:|:---:|:---:|
+| nothing to paste in | nothing to sign up for | your audio stays home | it's your computer |
+
 </div>
 
 > [!WARNING]
-> **OmniVoice Studio is in active beta.** Things may break between releases. For the latest features and fixes, clone the repo and run from source rather than using pre-built installers. Bug reports and PRs are very welcome — [open an issue](https://github.com/debpalash/OmniVoice-Studio/issues) or [join Discord](https://discord.gg/bzQavDfVV9).
+> **OmniVoice Studio is in active beta.** Things may break between releases — for the latest features and fixes, clone the repo and run from source rather than the pre-built installers. Bug reports and PRs are very welcome: [open an issue](https://github.com/debpalash/OmniVoice-Studio/issues) or [join Discord](https://discord.gg/bzQavDfVV9).
 
 <div align="center">
   <br/>
@@ -46,7 +58,68 @@
 
 <br/>
 
-## Features
+<a id="screenshots"></a>
+
+## 📸 See it in action
+
+<table>
+  <tr>
+    <td align="center" width="50%">
+      <img src="docs/screenshot-studio.png" alt="Studio" width="100%"/>
+      <br/><b>Studio</b><br/>
+      <sub>Generate &amp; clone in one workspace — a 3-second clip mirrors any voice, 646 languages, zero-shot.</sub>
+    </td>
+    <td align="center" width="50%">
+      <img src="docs/screenshot-design.png" alt="Voice Design" width="100%"/>
+      <br/><b>Voice Design</b><br/>
+      <sub>Build new voices from scratch — gender, age, accent, pitch, emotion, dialect.</sub>
+    </td>
+  </tr>
+  <tr>
+    <td align="center">
+      <img src="docs/screenshot-gallery.png" alt="Voice Gallery" width="100%"/>
+      <br/><b>Voice Gallery</b><br/>
+      <sub>Browse ready-made archetype voices with language filters — or build your own library.</sub>
+    </td>
+    <td align="center">
+      <img src="docs/screenshot-dub.png" alt="Video Dubbing" width="100%"/>
+      <br/><b>Video Dubbing</b><br/>
+      <sub>A real dub, end to end: 37 segments transcribed, translated to Bengali, re-voiced, and timed — ready to export as MP4.</sub>
+    </td>
+  </tr>
+  <tr>
+    <td align="center">
+      <img src="docs/screenshot-engines.png" alt="Settings — Engines" width="100%"/>
+      <br/><b>Settings → Engines</b><br/>
+      <sub>The engine compatibility matrix — 14 TTS engines with per-engine GPU preflight, no silent CPU fallback.</sub>
+    </td>
+    <td align="center">
+      <img src="docs/screenshot-settings.png" alt="Settings — Models" width="100%"/>
+      <br/><b>Settings → Models</b><br/>
+      <sub>One-click model store — auto-detects your platform (CUDA / MPS / CPU) and recommends the right models.</sub>
+    </td>
+  </tr>
+  <tr>
+    <td align="center">
+      <img src="docs/screenshot-openapi.png" alt="Settings — API Reference" width="100%"/>
+      <br/><b>API Reference</b><br/>
+      <sub>The full local REST API, embedded — every endpoint documented with copy-paste client snippets.</sub>
+    </td>
+    <td align="center">
+      <img src="docs/screenshot-updates.png" alt="Settings — What's New" width="100%"/>
+      <br/><b>What's New</b><br/>
+      <sub>In-app changelog reader — see exactly what shipped in each release without leaving the app.</sub>
+    </td>
+  </tr>
+</table>
+
+---
+
+<a id="features"></a>
+
+## ✨ Features
+
+The eight headliners — and twelve more waiting under the fold.
 
 <table>
 <tr>
@@ -74,94 +147,68 @@
   </td>
   <td align="center" valign="top">
     <h3>⌨️ Dictation Widget</h3>
-    <p><code>⌘+⇧+Space</code> from <b>any app</b>.<br/>Transcribes, auto-pastes, disappears.</p>
+    <p><kbd>⌘</kbd>+<kbd>⇧</kbd>+<kbd>Space</kbd> from <b>any app</b>.<br/>Transcribes, auto-pastes, disappears.</p>
   </td>
-  <td align="center" valign="top">
-    <h3>🔊 Vocal Isolation</h3>
-    <p>Demucs-powered. Splits speech<br/>from music, <b>keeps the background</b>.</p>
-  </td>
-  <td align="center" valign="top">
-    <h3>👥 Speaker Diarization</h3>
-    <p>Pyannote + WhisperX.<br/><b>Auto-identifies</b> who said what.</p>
-  </td>
-</tr>
-<tr>
-  <td align="center" valign="top">
-    <h3>📦 Batch Queue</h3>
-    <p>Drop <b>50 videos</b>, walk away.<br/>Progress bars per job.</p>
-  </td>
-  <td align="center" valign="top">
-    <h3>🤖 MCP Server</h3>
-    <p>Use OmniVoice from <b>Claude</b>,<br/>Cursor, or any MCP client.</p>
-  </td>
-  <td align="center" valign="top">
-    <h3>🛡️ AI Watermark</h3>
-    <p>AudioSeal (Meta). <b>Invisible</b>,<br/>survives compression.</p>
-  </td>
-  <td align="center" valign="top">
-    <h3>🔬 Diagnostics</h3>
-    <p>Self-check, error journal,<br/>scrubbed <b>diagnostic bundle</b>.</p>
-  </td>
-</tr>
-<tr>
   <td align="center" valign="top">
     <h3>🔐 100% Local</h3>
     <p>No keys, no cloud, no accounts.<br/><b>Your machine only</b>.</p>
   </td>
   <td align="center" valign="top">
-    <h3>⚡ GPU Auto-Detect</h3>
-    <p>CUDA · MPS · ROCm · CPU.<br/>≤8 GB? <b>Auto-offloads</b>.</p>
-  </td>
-  <td align="center" valign="top">
-    <h3>🧩 Extensible</h3>
-    <p>Subclass <code>TTSbackend</code>,<br/>add any engine in <b>~50 lines</b>.</p>
-  </td>
-  <td align="center" valign="top">
-    <h3>🧭 Engine Routing</h3>
-    <p>Preflight GPU check per engine.<br/><b>No silent CPU fallback</b>.</p>
-  </td>
-</tr>
-<tr>
-  <td align="center" valign="top">
-    <h3>🎒 Portable Personas</h3>
-    <p>Export voices as <code>.ovsvoice</code><br/>bundles — identity + <b>watermark</b>.</p>
-  </td>
-  <td align="center" valign="top">
-    <h3>♾️ Unlimited TTS</h3>
-    <p>Sentence-chunked generation.<br/><b>No length cap</b>. Streaming via WS.</p>
-  </td>
-  <td align="center" valign="top">
-    <h3>🌐 Remote Backend</h3>
-    <p>Point UI at a remote server.<br/>Tailscale-friendly. <b>Bearer auth</b>.</p>
-  </td>
-  <td align="center" valign="top">
-    <h3>🧠 Dictation + LLM</h3>
-    <p>Local LLM cleanup of transcripts.<br/>Optional echo <b>cancellation</b>.</p>
+    <h3>🤖 MCP Server</h3>
+    <p>Use OmniVoice from <b>Claude</b>,<br/>Cursor, or any MCP client.</p>
   </td>
 </tr>
 </table>
 
+<details>
+<summary><b>…and 12 more</b> — isolation, diarization, batch, watermarking, diagnostics, and friends</summary>
+
+<br/>
+
+- 🔊 **Vocal Isolation** — Demucs-powered: splits speech from music and keeps the background bed.
+- 👥 **Speaker Diarization** — Pyannote + WhisperX auto-identify who said what.
+- 📦 **Batch Queue** — drop 50 videos, walk away; per-job progress bars.
+- 🛡️ **AI Watermark** — AudioSeal (Meta): invisible, survives compression.
+- 🔬 **Diagnostics** — self-check suite, error journal, scrubbed diagnostic bundles.
+- ⚡ **GPU Auto-Detect** — CUDA · MPS · ROCm (Linux, opt-in) · CPU; ≤8 GB VRAM auto-offloads.
+- 🧭 **Engine routing** — preflight GPU check per engine; no silent CPU fallback.
+- 🧩 **Extensible** — subclass `TTSBackend`, add any engine in ~50 lines.
+- 🎒 **Portable personas** — export voices as `.ovsvoice` bundles: identity + watermark.
+- ♾️ **Unlimited TTS** — sentence-chunked generation, no length cap, streaming via WebSocket.
+- 🌐 **Remote backend** — point the UI at a remote server; Tailscale-friendly, bearer auth.
+- 🧠 **Dictation + LLM** — local-LLM cleanup of transcripts, optional echo cancellation.
+
+</details>
+
 ---
 
-## Quickstart
+<a id="quickstart"></a>
+
+## ⚡ Quickstart
 
 <div align="center">
   <a href="https://github.com/debpalash/OmniVoice-Studio/releases/latest"><img src="https://img.shields.io/badge/macOS-DMG_(Apple_Silicon)-000?style=for-the-badge&logo=apple&logoColor=white" alt="Download macOS DMG" /></a>
   <a href="https://github.com/debpalash/OmniVoice-Studio/releases/latest"><img src="https://img.shields.io/badge/Windows-MSI_(x64)-0078D4?style=for-the-badge&logo=windows&logoColor=white" alt="Download Windows MSI" /></a>
   <a href="https://github.com/debpalash/OmniVoice-Studio/releases/latest"><img src="https://img.shields.io/badge/Linux-AppImage_(x64)-FCC624?style=for-the-badge&logo=linux&logoColor=black" alt="Download Linux AppImage" /></a>
-  <a href="https://github.com/debpalash/OmniVoice-Studio/releases/latest"><img src="https://img.shields.io/badge/Debian-.deb-A81D33?style=for-the-badge&logo=debian&logoColor=white" alt="Download Debian .deb" /></a>
   <br/>
   <sub><b>macOS:</b> first launch needs a one-time approval — right-click → <b>Open</b> (or System Settings → Privacy &amp; Security → <b>"Open Anyway"</b> on macOS 15). No Terminal needed. <a href="docs/install/macos.md#gatekeeper-quarantine">Why?</a></sub>
+  <br/>
+  <sub><b>Intel Macs are not supported for the local backend:</b> the app UI installs, but the Python backend cannot run because PyTorch no longer ships Intel-Mac (x86_64) wheels (<a href="https://github.com/debpalash/OmniVoice-Studio/issues/889">#889</a>) — see <a href="docs/install/macos.md">docs/install/macos.md</a>.</sub>
 </div>
 
-Per-OS install guides — pick yours and follow it end-to-end:
+Pick your OS and follow the guide end-to-end:
 
-- **macOS** — [docs/install/macos.md](docs/install/macos.md)
-- **Windows** — [docs/install/windows.md](docs/install/windows.md)
-- **Linux** — [docs/install/linux.md](docs/install/linux.md)
-- **Docker** — [docs/install/docker.md](docs/install/docker.md) · [Docker Hub: `palashdeb/omnivoice-studio`](https://hub.docker.com/r/palashdeb/omnivoice-studio)
+- 🍎 **macOS** — [docs/install/macos.md](docs/install/macos.md)
+- 🪟 **Windows** — [docs/install/windows.md](docs/install/windows.md)
+- 🐧 **Linux** — [docs/install/linux.md](docs/install/linux.md)
+- 🐳 **Docker** — [docs/install/docker.md](docs/install/docker.md) · [Docker Hub: `palashdeb/omnivoice-studio`](https://hub.docker.com/r/palashdeb/omnivoice-studio)
 
-Stuck? Run the built-in self-check first — **Settings → About → "Run
+<details>
+<summary><b>🧰 Stuck? Self-checks, tokens &amp; restricted networks</b></summary>
+
+<br/>
+
+Run the built-in self-check first — **Settings → About → "Run
 self-check"** in the app, or `uv run python backend/main.py --diagnose` from
 a checkout (`--deep` also test-loads the active engine). Then see
 [docs/install/troubleshooting.md](docs/install/troubleshooting.md) for the
@@ -176,57 +223,13 @@ diarization-specific gating, see
 speed, the ⚡ fast-download (Xet) status, and restricted-network / mirror
 options, see [docs/downloading-models.md](docs/downloading-models.md).
 
-## Screenshots
-
-<table>
-  <tr>
-    <td align="center" width="50%">
-      <img src="docs/screenshot-clone.png" alt="Voice Clone" width="100%"/>
-      <br/><b>Voice Clone</b><br/>
-      <sub>Drop a 3-second clip → mirror any voice. 646 languages, zero-shot.</sub>
-    </td>
-    <td align="center" width="50%">
-      <img src="docs/screenshot-design.png" alt="Voice Design" width="100%"/>
-      <br/><b>Voice Design</b><br/>
-      <sub>Build new voices from scratch — gender, age, accent, pitch, style.</sub>
-    </td>
-  </tr>
-  <tr>
-    <td align="center">
-      <img src="docs/screenshot-dub.png" alt="Video Dubbing" width="100%"/>
-      <br/><b>Video Dubbing</b><br/>
-      <sub>Upload or paste a YouTube URL. Transcribe, translate, re-voice, export.</sub>
-    </td>
-    <td align="center">
-      <img src="docs/screenshot-gallery.png" alt="Voice Gallery" width="100%"/>
-      <br/><b>Voice Gallery</b><br/>
-      <sub>Search YouTube, browse categories, download clips, build your library.</sub>
-    </td>
-  </tr>
-  <tr>
-    <td align="center">
-      <img src="docs/screenshot-settings.png" alt="Settings — Models" width="100%"/>
-      <br/><b>Settings → Models</b><br/>
-      <sub>15 models. One-click install. Auto-detects your platform (CUDA / MPS / CPU).</sub>
-    </td>
-    <td align="center">
-      <img src="docs/screenshot-libraryprojects.png" alt="Projects" width="100%"/>
-      <br/><b>Projects</b><br/>
-      <sub>Dub projects, voice profiles, generation history, exports — all searchable.</sub>
-    </td>
-  </tr>
-  <tr>
-    <td align="center" colspan="2">
-      <img src="docs/screenshot-logs.png" alt="Settings — Logs" width="100%"/>
-      <br/><b>Settings → Logs</b><br/>
-      <sub>Live backend, frontend, and Tauri runtime logs. Filter, refresh, clear.</sub>
-    </td>
-  </tr>
-</table>
+</details>
 
 ---
 
-## Why OVS?
+<a id="why-ovs"></a>
+
+## 💡 Why OmniVoice?
 
 ElevenLabs charges **$5–$330/mo** and processes your audio on their servers. OmniVoice Studio runs **on your hardware, with no usage limits.**
 
@@ -240,15 +243,15 @@ ElevenLabs charges **$5–$330/mo** and processes your audio on their servers. O
 | **Video Dubbing** | ✅ Cloud-only | ✅ Fully local |
 | **Data Privacy** | Audio sent to cloud | **Nothing leaves your machine** |
 | **API Keys** | Required | Not needed |
-| **GPU Support** | N/A (cloud) | CUDA · Apple Silicon · ROCm · CPU |
+| **GPU Support** | N/A (cloud) | CUDA · Apple Silicon · ROCm (Linux) · CPU |
 | **Desktop App** | ❌ | ✅ macOS · Windows · Linux |
-| **TTS Engines** | 1 | **11** (OmniVoice, CosyVoice 3, GPT-SoVITS, VoxCPM2, MOSS-TTS-Nano, KittenTTS, MLX-Audio, Sherpa-ONNX, IndexTTS 2, OmniVoice GGUF, Supertonic 3) |
+| **TTS Engines** | 1 | **14** (OmniVoice, CosyVoice 3, GPT-SoVITS, VoxCPM2, MOSS-TTS-Nano, KittenTTS, MLX-Audio, Sherpa-ONNX, IndexTTS 2, OmniVoice GGUF, Supertonic 3, MOSS-TTS-v1.5, dots.tts, Confucius4-TTS) |
 | **ASR Engines** | 1 | **9** (WhisperX, Faster-Whisper, MLX Whisper, PyTorch Whisper, Parakeet, Moonshine, FunASR, isolated Faster-Whisper, sherpa-onnx live dictation) |
 | **MCP Server** | ❌ | ✅ Use from Claude, Cursor, any MCP client |
 | **Self-check** | ❌ | ✅ Diagnostics suite, error journal, scrubbed debug bundles |
 | **Customizable** | ❌ Closed | ✅ Fork it, extend it, ship it |
 
-OmniVoice Studio gives you professional-grade AI tools without the subscription or the cloud.
+Professional-grade voice AI, minus the subscription and the cloud.
 
 <div align="center">
   <br/>
@@ -259,23 +262,36 @@ OmniVoice Studio gives you professional-grade AI tools without the subscription
 
 ---
 
-## System Requirements
+## 🖥️ System Requirements
 
 | | **Minimum** | **Recommended** |
 |---|---|---|
-| **OS** | Windows 10, macOS 12+, Ubuntu 20.04+ | Any modern 64-bit OS |
+| **OS** | Windows 10, macOS 12+ (Apple Silicon), Ubuntu 20.04+ | Any modern 64-bit OS |
 | **RAM** | 8 GB | 16 GB+ |
 | **VRAM (GPU)** | 4 GB (auto-offloads TTS to CPU) | 8 GB+ (NVIDIA RTX 3060+) |
 | **Disk** | 10 GB free (models + cache) | 20 GB+ SSD |
 | **Python** | 3.10+ (managed by `uv`) | 3.11–3.12 |
-| **GPU** | Optional — CPU works | NVIDIA CUDA · Apple Silicon MPS · AMD ROCm |
+| **GPU** | Optional — CPU works | NVIDIA CUDA · Apple Silicon MPS · AMD ROCm (Linux only) |
 
 > [!TIP]
 > On GPUs with **≤8 GB VRAM**, OmniVoice automatically offloads TTS to CPU during transcription — no config needed. A dedicated GPU is not required; the entire pipeline runs on CPU (just slower).
 
-### TTS Engines
+> [!NOTE]
+> **AMD GPUs:** ROCm acceleration is **Linux-only and opt-in** — pick **"AMD GPU (ROCm)"** on the first-run setup screen or set `OMNIVOICE_TORCH_VARIANT=rocm` ([docs/install/linux.md](docs/install/linux.md#amd-gpu-rocm)). **On Windows, AMD GPUs (incl. Ryzen AI iGPUs) run CPU-only**: PyTorch has no Windows ROCm wheels, so Windows GPU acceleration is NVIDIA/CUDA-only ([docs/install/windows.md](docs/install/windows.md#gpu-support)).
 
-OmniVoice ships a multi-engine TTS backend. The default engine (OmniVoice) is always available; additional engines are opt-in and auto-detected. Switch engines in **Settings → TTS Engine** or via the `OMNIVOICE_TTS_BACKEND` env var.
+> [!IMPORTANT]
+> **macOS Intel (x86_64) is unsupported for the local backend:** the app UI installs, but the Python backend cannot run because PyTorch no longer ships Intel-Mac wheels ([#889](https://github.com/debpalash/OmniVoice-Studio/issues/889)). Intel-Mac users can still point the UI at a remote backend on another machine — see [docs/install/macos.md](docs/install/macos.md).
+
+<a id="tts-engines"></a>
+
+### 🗣️ TTS Engines
+
+**14 engines, one picker.** OmniVoice (default, 600+ languages) is always available; CosyVoice 3, GPT-SoVITS, VoxCPM2, MOSS-TTS-Nano, KittenTTS, MLX-Audio, and Sherpa-ONNX are opt-in and auto-detected — plus six lazy-installed heavyweights (IndexTTS 2, OmniVoice GGUF, Supertonic 3, MOSS-TTS-v1.5, dots.tts, Confucius4-TTS). Switch in **Settings → TTS Engine** or via the `OMNIVOICE_TTS_BACKEND` env var — the selection applies everywhere synthesis happens: single-clip generation, Voice Cloning, Video Dubbing, and Batch TTS.
+
+<details>
+<summary><b>📊 The full matrix</b> — 14 engines × platform × clone/instruct × license</summary>
+
+<br/>
 
 | Engine | Languages | Clone | Instruct | Linux | macOS ARM | Windows | License |
 |--------|:---------:|:-----:|:--------:|:-----:|:---------:|:-------:|:-------:|
@@ -296,11 +312,22 @@ OmniVoice ships a multi-engine TTS backend. The default engine (OmniVoice) is al
 
 > **CUDA** = GPU-accelerated · **MPS** = Apple Silicon Metal · **CPU** = runs everywhere, slower for large models · KittenTTS and MOSS-TTS-Nano run realtime on CPU · MLX-Audio is Apple Silicon only · ⚡ = lazy-registered (installed on first use)
 >
+> **Clone** matters beyond single-clip generation: Video Dubbing (and any Batch job with a pinned voice) needs reference-audio cloning to preserve speaker identity, so picking a Clone-less engine (KittenTTS, Sherpa-ONNX, Supertonic 3) as the active engine fails those jobs up front with an actionable message instead of silently falling back to OmniVoice.
+>
 > **MOSS-TTS-v1.5** (8B, ~16 GB weights) and **dots.tts** (2B, ~9 GB weights) are heavyweight opt-in engines that run in their own isolated venv from a local clone — see [MOSS-TTS-v1.5](docs/engines/moss-tts-v15.md) and [dots.tts](docs/engines/dots-tts.md). Neither claims Apple-Silicon **MPS** (upstream is CUDA/CPU only; on a Mac they run on CPU). dots.tts upstream is Linux/macOS only — no Windows path. **Confucius4-TTS** (14-language cross-lingual zero-shot cloning) is similar — its own Python 3.10 venv from a clone; CUDA recommended, CPU validated end-to-end (slow, ~17× realtime; no MPS — tested slower than CPU); see [Confucius4-TTS](docs/engines/confucius4-tts.md).
 
-### ASR Engines
+</details>
 
-OmniVoice ships a multi-engine ASR (speech-to-text) backend that powers dictation, video dubbing, and subtitle generation — all fully local. **WhisperX** is the cross-platform default; the rest are opt-in and auto-detected. Switch in **Settings → ASR Engine** or via the `OMNIVOICE_ASR_BACKEND` env var.
+<a id="asr-engines"></a>
+
+### 🎧 ASR Engines
+
+**9 engines, all fully local** — they power dictation, video dubbing, and subtitles. **WhisperX** is the cross-platform default (~100 languages, word-level timing); the rest are opt-in and auto-detected. Switch in **Settings → ASR Engine** or via the `OMNIVOICE_ASR_BACKEND` env var.
+
+<details>
+<summary><b>📊 The full lineup</b> — 9 engines, what each is best at, and compute-type notes</summary>
+
+<br/>
 
 | Engine | `OMNIVOICE_ASR_BACKEND` | Languages | Best for |
 |--------|-------------------------|:---------:|----------|
@@ -318,9 +345,11 @@ OmniVoice ships a multi-engine ASR (speech-to-text) backend that powers dictatio
 
 > **GPU without efficient float16?** On older NVIDIA GPUs (Maxwell/Pascal, GTX 16xx) or after a CTranslate2/cuDNN mismatch, the CTranslate2 ASR engines (WhisperX, Faster-Whisper) can't run `float16` and OmniVoice automatically retries on `int8` — no config needed. If transcription still fails, pin the compute type with the `ASR_COMPUTE_TYPE` env var (escape hatch): `ASR_COMPUTE_TYPE=int8` (or `float32` for CPU). Set it to `int8` and restart the backend.
 
+</details>
+
 ---
 
-## Architecture
+## 🏗️ Architecture
 
 ```
 ┌─────────────────────────────────────────────────────────────┐
@@ -338,11 +367,50 @@ OmniVoice ships a multi-engine ASR (speech-to-text) backend that powers dictatio
          CUDA / MPS / ROCm / CPU (auto-detected + routed)
 ```
 
+<a id="openai-api"></a>
+
+## 🔌 OpenAI-compatible API
+
+Already have a script, agent, or tool that speaks OpenAI's audio API? Point it at `http://localhost:3900/v1` — no key needed, no code changes. The backend ships a drop-in surface for the audio endpoints, wired to whichever TTS/ASR engine you have active (and yes, `voice` accepts your cloned voice-profile IDs).
+
+| Endpoint | What it does |
+|---|---|
+| `POST /v1/audio/speech` | TTS — text in; `mp3` / `wav` / `flac` / `opus` / `pcm` out. `tts-1` / `tts-1-hd` map to your active engine; OpenAI voice names (`alloy`, …) are accepted. |
+| `POST /v1/audio/transcriptions` | STT — audio file in; `json`, `text`, `verbose_json`, `srt`, or `vtt` out. `whisper-1` maps to your active ASR engine. |
+| `GET /v1/audio/voices` | OmniVoice extension — lists every voice profile and engine, so clients can discover your clones. |
+
+```sh
+curl http://localhost:3900/v1/audio/speech \
+  -H "Content-Type: application/json" \
+  -d '{"model": "tts-1", "voice": "alloy", "input": "Generated on my own hardware.", "response_format": "wav"}' \
+  --output speech.wav
+```
+
+```python
+from openai import OpenAI
+client = OpenAI(base_url="http://localhost:3900/v1", api_key="none")  # any string works — nothing checks it
+
+result = client.audio.transcriptions.create(model="whisper-1", file=open("clip.wav", "rb"))
+print(result.text)
+```
+
+Want the whole surface (100+ endpoints)? The full REST API reference is embedded in the app — **Settings → OpenAPI Reference** (Scalar-powered), or the `{}` button in the footer.
+
 ---
 
-## Roadmap
+## 🗺️ Roadmap
 
-### ✅ Shipped
+### 🔜 Up Next
+
+- 🎬 **Lip-sync v2** — visual speech timing with wav2lip
+- 🌐 **Hosted Demo** — try OmniVoice without installing anything
+- 🔌 **Plugin Marketplace** — community-contributed TTS engines and effects
+- 🎵 **Real-time Voice Changer** — live microphone transformation during calls
+
+<details>
+<summary><b>✅ Everything shipped so far</b> — the receipts, by category</summary>
+
+<br/>
 
 | Category | Features |
 |----------|----------|
@@ -353,29 +421,26 @@ OmniVoice ships a multi-engine ASR (speech-to-text) backend that powers dictatio
 | **Multi-Lang** | Multi-language batch picker, batch dubbing queue with sequential GPU execution |
 | **Diarization** | Pyannote ML diarization, auto speaker clone extraction, per-speaker voice assignment |
 | **ASR** | 9 engines (WhisperX, Faster-Whisper, isolated Faster-Whisper, MLX Whisper, PyTorch Whisper, Parakeet TDT, Moonshine, FunASR/SenseVoice, sherpa-onnx live dictation), crash-isolated subprocess backend |
-| **TTS** | 11 engines (OmniVoice, CosyVoice 3, GPT-SoVITS, VoxCPM2, MOSS-TTS-Nano, KittenTTS, MLX-Audio, Sherpa-ONNX, + lazy: IndexTTS 2, OmniVoice GGUF, Supertonic 3), engine routing with GPU preflight |
+| **TTS** | 14 engines (OmniVoice, CosyVoice 3, GPT-SoVITS, VoxCPM2, MOSS-TTS-Nano, KittenTTS, MLX-Audio, Sherpa-ONNX, + lazy: IndexTTS 2, OmniVoice GGUF, Supertonic 3, MOSS-TTS-v1.5, dots.tts, Confucius4-TTS), engine routing with GPU preflight |
 | **Infra** | Docker deployment, CUDA/MPS/ROCm auto-detect, cuDNN 8 compat, VRAM-aware model offloading, engine routing (no silent CPU fallback), diagnostics suite & error journal, restricted-network mirror support |
 | **AI Provenance** | AudioSeal invisible watermarking (SynthID-like), video logo overlay, watermark detection API |
 | **UX** | Undo/redo, keyboard shortcuts, drag-and-drop, session persistence, glassmorphism design system, UI scale fix for Linux/WebKitGTK |
 | **Real-time Events** | WebSocket event bus — instant sidebar refresh on data mutations, exponential backoff reconnect |
 | **State Management** | Zustand store migration — `uiSlice`, `pillSlice`, `dubSlice`, `generateSlice`, `prefsSlice`, `glossarySlice` |
-| **Desktop** | Cross-platform Tauri installers (macOS DMG/Intel, Windows MSI, Linux deb/AppImage), auto-update infrastructure, single-instance enforcement, close-to-tray, macOS Gatekeeper fix |
+| **Desktop** | Cross-platform Tauri installers (macOS DMG — Apple Silicon; Intel unsupported for the local backend, #889 — Windows MSI, Linux deb/AppImage), auto-update infrastructure, single-instance enforcement, close-to-tray, macOS Gatekeeper fix |
 | **Dictation** | Global system-wide hotkey (`⌘+⇧+Space`), frameless floating widget, streaming ASR via WebSocket, auto-paste, customizable hotkey, local-LLM transcript refinement |
 | **Batch Pipeline** | Full batch TTS: extract → transcribe → translate → generate → mix → export, with live progress tracking |
 | **MCP Server** | OmniVoice as a local TTS/STT provider for Claude, Cursor, and any MCP client |
 | **Remote Backend** | Point the desktop UI at a remote backend URL with bearer auth (Tailscale-documented) |
 | **Reliability** | Stall watchdog on bootstrap splash, per-engine GPU compatibility matrix, actionable errors for non-executable engine binaries, setuptools auto-repair |
 
-### 🔜 Up Next
-
-- 🎬 **Lip-sync v2** — visual speech timing with wav2lip
-- 🌐 **Hosted Demo** — try OmniVoice without installing anything
-- 🔌 **Plugin Marketplace** — community-contributed TTS engines and effects
-- 🎵 **Real-time Voice Changer** — live microphone transformation during calls
+</details>
 
 ---
 
-## Sponsor / Donate
+<a id="sponsor--donate"></a>
+
+## 💜 Sponsor / Donate
 
 OmniVoice Studio is built by one developer using Claude Code and AI agents — and the agent bills are real. Over the last three months I've spent thousands of dollars on Claude subscriptions to keep the features shipping, the bugs fixed, and your issues answered. If OmniVoice has created value for you, helping cover those bills means I can keep developing full-time.
 
@@ -396,31 +461,57 @@ OmniVoice Studio is built by one developer using Claude Code and AI agents — a
 
 </div>
 
+<a id="sponsors"></a>
+
+### 🌟 Sponsors
+
+OmniVoice is **free** and **AGPL-3.0** — no paid tier, no SaaS revenue. Sponsors keep development going, and in return get a logo slot here, in the app, and (for top tiers) on the project website. It's a thank-you, never a paywall. **[See tiers & become a sponsor →](SPONSORS.md)**
+
+<div align="center">
+
+<!-- SPONSORS:START — logo slots are filled here as sponsors come aboard; see SPONSORS.md -->
+
+**Your logo here** — [become a sponsor](SPONSORS.md)
+
+<!-- SPONSORS:END -->
+
+</div>
+
+<sub>💡 GitHub also shows a **Sponsor** button at the top of this repo, wired to the same links via <a href=".github/FUNDING.yml"><code>.github/FUNDING.yml</code></a>.</sub>
+
 ---
 
-## Community
+## 💬 Community
 
 <div align="center">
   <a href="https://discord.gg/bzQavDfVV9"><img src="https://img.shields.io/badge/💬_Discord-Join_Community-5865F2?style=for-the-badge&logo=discord&logoColor=white" alt="Join Discord" /></a>
+  <br/>
+  <sub>We respond to setup questions within hours, not days.</sub>
 </div>
 
+<details>
+<summary><b>What happens in there</b></summary>
+
 <br/>
 
 | Channel | What happens there |
 |---------|--------------------|
-| `#showcase` | Members share their dubs, clones, and voice designs |
-| `#help` | Setup issues, GPU troubleshooting, model questions |
-| `#feature-requests` | Vote on what gets built next |
-| `#dev` | Architecture discussions, PR reviews, engine integrations |
-| `#announcements` | Release notes, breaking changes, early access |
+| `#announcements` | Release news and the big moments — new versions land here first |
+| `#releases` + `#changelog` | Every build and exactly what's inside it |
+| `#issues` | Bug reports as forum posts — triaged straight into GitHub issues |
+| `#ideas` | Feature requests, discussed and voted on |
+| `#discuss-ideas` | Design talk before things get built |
+| `#general` | Setup help, GPU troubleshooting, and showing off your dubs |
 
-**[→ Join the Discord](https://discord.gg/bzQavDfVV9)** — we respond to setup questions within hours, not days.
+</details>
 
 ---
 
-## Contributing
+<a id="contributing"></a>
 
-We welcome contributions of all kinds — bug fixes, new TTS engine adapters, UI improvements, docs, and translations.
+## 🤝 Contributing
+
+Yes please — bug fixes, new TTS engine adapters, UI improvements, docs, translations. All of it.
 
 - 📖 Read the **[Contributing Guide](CONTRIBUTING.md)** for setup, code style, and PR workflow
 - 🐛 Browse [good first issues](https://github.com/debpalash/OmniVoice-Studio/labels/good%20first%20issue)
@@ -428,7 +519,7 @@ We welcome contributions of all kinds — bug fixes, new TTS engine adapters, UI
 
 ---
 
-## FAQ
+## ❓ FAQ
 
 <details>
 <summary><b>Is this really as good as ElevenLabs?</b></summary>
@@ -439,7 +530,7 @@ For voice cloning and dubbing, yes — OmniVoice uses a state-of-the-art diffusi
 <details>
 <summary><b>Does it work on Apple Silicon (M1/M2/M3/M4)?</b></summary>
 <br/>
-Yes. MPS acceleration is auto-detected. MLX-optimized Whisper models are available for faster transcription on Apple hardware.
+Yes. MPS acceleration is auto-detected. MLX-optimized Whisper models are available for faster transcription on Apple hardware. <b>Intel Macs are not supported</b>: the app UI installs, but the local Python backend cannot run because PyTorch no longer ships Intel-Mac wheels (<a href="https://github.com/debpalash/OmniVoice-Studio/issues/889">#889</a>) — an Intel Mac can only be used with a remote backend.
 </details>
 
 <details>
@@ -463,12 +554,14 @@ Yes. MPS acceleration is auto-detected. MLX-optimized Whisper models are availab
 <details>
 <summary><b>Can I add my own TTS engine?</b></summary>
 <br/>
-Yes. OmniVoice uses a <b>built-in backend registry</b>. To add an engine in ~50 lines, subclass <code>TTSBackend</code> in <code>backend/services/tts_backend.py</code> and add it to the <code>_REGISTRY</code> dictionary. Eleven engines are built in: OmniVoice, CosyVoice 3, GPT-SoVITS, MLX-Audio (14+ sub-engines), VoxCPM2, MOSS-TTS-Nano, KittenTTS, Sherpa-ONNX, plus lazy-registered IndexTTS 2, OmniVoice GGUF, and Supertonic 3. See the <a href="#tts-engines">TTS Engines</a> section for details.
+Yes. OmniVoice uses a <b>built-in backend registry</b>. To add an engine in ~50 lines, subclass <code>TTSBackend</code> in <code>backend/services/tts_backend.py</code> and add it to the <code>_REGISTRY</code> dictionary. Fourteen engines are built in: OmniVoice, CosyVoice 3, GPT-SoVITS, MLX-Audio (14+ sub-engines), VoxCPM2, MOSS-TTS-Nano, KittenTTS, Sherpa-ONNX, plus lazy-registered IndexTTS 2, OmniVoice GGUF, Supertonic 3, MOSS-TTS-v1.5, dots.tts, and Confucius4-TTS. See the <a href="#tts-engines">TTS Engines</a> section for details.
 </details>
 
 ---
 
-## License
+<a id="license"></a>
+
+## 📜 License
 
 OmniVoice Studio is free and open-source software under the [**GNU Affero General Public License v3.0 (AGPL-3.0)**](https://www.gnu.org/licenses/agpl-3.0.html).
 
@@ -480,7 +573,7 @@ The bundled `omnivoice/` TTS model by Han Zhu remains Apache-2.0 upstream. See [
 
 ---
 
-## Acknowledgments
+## 🙏 Acknowledgments
 
 OmniVoice Studio is built on the shoulders of exceptional open-source work:
 
@@ -499,6 +592,17 @@ OmniVoice Studio is built on the shoulders of exceptional open-source work:
 
 ---
 
+## 🧰 More local open-source from the maker
+
+Like the local-first philosophy? It runs in the family:
+
+| Project | What it is |
+|---------|------------|
+| [**Opal**](https://github.com/debpalash/Opal) 💠 | **Play everything.** The evolved media player for the next decades of entertainment — video, anime, comics, torrents, Jellyfin/Plex, with local AI built in. |
+| [**memxt**](https://github.com/debpalash/memxt) 🧠 | **The fastest benchmarked open-source AI memory system.** 100% local memory for AI agents, with MCP support. |
+
+---
+
 <div align="center">
 
 <br/>

SPONSORS.md

@@ -0,0 +1,119 @@
+<div align="center">
+  <img src="docs/logo.png" alt="OmniVoice Logo" width="96" />
+  <h1>Sponsor OmniVoice Studio</h1>
+  <p><b>Keep the open-source ElevenLabs alternative free, local, and shipping.</b></p>
+</div>
+
+---
+
+## Why sponsor?
+
+OmniVoice Studio is built by one developer, in the open, using Claude Code and AI agents — and the agent bills are real. Over the last few months I've spent thousands of dollars on Claude subscriptions to keep features shipping, bugs fixed, and your issues answered.
+
+OmniVoice is **free**, **fully local**, and **AGPL-3.0**. There's no paid tier, no accounts, no cloud, and no SaaS revenue — nothing runs on a server we bill you for, because nothing runs on a server at all. That's the whole point, and it's also why there's no recurring revenue to fund development. Sponsorship is what makes continued full-time work possible.
+
+If OmniVoice has created value for you or your company, sponsoring means the next release keeps coming — and you get a thank-you (and, at most tiers, a logo slot) in return.
+
+### Where your money goes
+
+Every dollar goes to the cost of building OmniVoice — chiefly the **AI agent bills that keep it shipping** (Claude subscriptions and API usage), plus the occasional signing certificate, test hardware, and model-hosting costs. It is not a salary top-up; it's what keeps the lights on for continuous development.
+
+---
+
+## Sponsorship tiers
+
+Tiers are about **visibility and gratitude** — what you get is placement, not gated features (see [Not a paywall](#not-a-paywall)). Higher tiers include everything in the tiers below them.
+
+| Tier | Suggested monthly | What you get |
+|------|-------------------|--------------|
+| **🥉 Backer** | _set by owner_ <!-- OWNER: set amounts --> | Your name or handle listed in the **Backers** section of this file, with a link of your choice. |
+| **🟫 Bronze** | _set by owner_ <!-- OWNER: set amounts --> | Everything above, **plus** a small logo in `SPONSORS.md` **and** in the README [Sponsors section](README.md#sponsors). |
+| **🥈 Silver** | _set by owner_ <!-- OWNER: set amounts --> | Everything above, **plus** your logo in the **README** and in the app's **in-app Sponsors page footer** (as that page ships). |
+| **🥇 Gold** | _set by owner_ <!-- OWNER: set amounts --> | Everything above, **plus** a **prominent logo slot** and link on the project **website / landing page**. |
+
+> **Amounts are set by the maintainer** — look for the `<!-- OWNER: set amounts -->` markers in this file's source. If you don't see a price that fits, say so in your inquiry; custom and annual arrangements are welcome.
+
+Placements marked "as that page ships" (the in-app Sponsors page and the project website) are on the near-term roadmap. Until they exist, Silver/Gold logos live in `SPONSORS.md` and the README, and are added to the app and site the moment those land — no re-application needed.
+
+---
+
+## How to become a sponsor
+
+**1. Open a sponsorship inquiry (recommended).** This opens a short GitHub form (name/org, logo, tier, contact) so we can get you set up:
+
+> **[→ Open a sponsorship inquiry](https://github.com/debpalash/OmniVoice-Studio/issues/new?template=sponsor.yml)**
+
+**2. Or start recurring support directly:**
+
+- **Ko-fi (recurring or one-time):** [ko-fi.com/debpalash](https://ko-fi.com/debpalash)
+- **PayPal (one-time):** [paypal.me/palashCoder](https://paypal.me/palashCoder)
+
+If you sponsor via Ko-fi/PayPal and want a logo slot, still open an inquiry (or drop a note there) so we know who to credit and where to link.
+
+**3. Prefer to talk first?** Reach out directly:
+
+- Email: <!-- OWNER: add your sponsor contact email here if you want one public -->
+- Or ask in the `#dev` / `#announcements` channels on [Discord](https://discord.gg/bzQavDfVV9).
+
+---
+
+## Logo & asset guidelines
+
+To make your logo look sharp everywhere (README on GitHub, the in-app page, the website), please send:
+
+- **Format:** **SVG preferred** (scales cleanly); otherwise **PNG at 2× resolution**.
+- **Background:** **transparent** — no baked-in white/black box.
+- **Contrast:** send a variant that stays legible on **both light and dark** backgrounds, or one light-mode and one dark-mode file (GitHub and the app both render in either theme).
+- **Dimensions:** legible at **~40px tall**; keep the wordmark within roughly **480px wide**. Landscape/wordmark shapes work best in the README row.
+- **File size:** keep SVGs under ~50 KB and PNGs under ~100 KB.
+- **Link target:** the destination URL you want the logo to point to (usually your homepage).
+
+**How your logo gets added:**
+
+- **Easiest:** attach the asset and link in your [sponsorship inquiry](https://github.com/debpalash/OmniVoice-Studio/issues/new?template=sponsor.yml) — the maintainer places it.
+- **Or open a PR:** add your asset under `docs/sponsors/` and an entry to the tables in this file. Silver/Gold logos are also wired into the app's in-app Sponsors page (via the `sponsors.js` manifest) and the project website as those surfaces ship.
+
+By sponsoring you confirm you have the right to use the submitted logo and grant OmniVoice permission to display it in the contexts above. We won't alter your logo beyond scaling, and we'll remove it promptly on request.
+
+---
+
+## Current sponsors
+
+OmniVoice doesn't have any sponsors yet — **you could be the first.** These slots fill in as sponsors come aboard.
+
+### 🥇 Gold
+
+_Be the first Gold sponsor — [claim this slot](#how-to-become-a-sponsor)._
+
+### 🥈 Silver
+
+_Open — [become a Silver sponsor](#how-to-become-a-sponsor)._
+
+### 🟫 Bronze
+
+_Open — [become a Bronze sponsor](#how-to-become-a-sponsor)._
+
+### 🥉 Backers
+
+_Open — [become a Backer](#how-to-become-a-sponsor)._
+
+<!-- When a sponsor joins, add them to the matching section above:
+     - Logo tiers (Bronze+):  <a href="https://sponsor.example"><img src="docs/sponsors/name.svg" alt="Name" height="48" /></a>
+     - Backers:               - [Name / handle](https://link)  -->
+
+---
+
+## Not a paywall
+
+Sponsorship is a **thank-you, never a paywall.**
+
+Every feature of OmniVoice Studio is and will remain **free** and **open-source under [AGPL-3.0](LICENSE)**. Sponsors do **not** get private builds, gated features, license exceptions, or anything that degrades the experience for people who don't (or can't) pay. What sponsors get is **visibility and our gratitude** — and the knowledge that they're directly funding the next release.
+
+OmniVoice stays local-first and fully functional with zero dollars spent. Sponsoring just helps it keep getting better, faster.
+
+---
+
+<div align="center">
+<sub>Thank you for keeping local-first voice AI alive and free. ❤️</sub><br/>
+<sub>Questions? <a href="https://github.com/debpalash/OmniVoice-Studio/issues/new?template=sponsor.yml">Open an inquiry</a> · <a href="https://discord.gg/bzQavDfVV9">Discord</a></sub>
+</div>

backend.spec

@@ -33,6 +33,14 @@ hiddenimports = [
     'uvicorn.lifespan', 'uvicorn.lifespan.on',
     'fastapi', 'fastapi.responses', 'starlette',
     'multipart',
+    # SOCKS proxy support (#959). httpx imports socksio lazily inside a
+    # try/except (only when a socks5:// proxy env var is set), so
+    # PyInstaller's static tracer never sees it — without this entry the
+    # frozen installers keep raising "Using SOCKS proxy, but the 'socksio'
+    # package is not installed" on every model load under a SOCKS proxy,
+    # even though pyproject.toml ships the package. Guarded by
+    # tests/test_socks_proxy.py.
+    'socksio',
 
     # Core
     'uuid', 'asyncio',

backend/api/routers/batch.py

@@ -179,6 +179,21 @@ async def _run_batch_pipeline(job_id: str, job: dict):
             job["status"] = "failed"
         return
 
+    # ── Engine resolution (issue #312 class) ────────────────────────────
+    # Batch used to hardcode OmniVoice via get_model() regardless of the
+    # engine selected in Settings → Engines. require_cloning only when a
+    # specific voice is pinned (job["voice_id"]) — an unpinned job is fine on
+    # any active engine. Resolved ONCE for the whole job (every language
+    # below shares the same active engine); an uncaught ValueError here
+    # propagates to _worker()'s existing except-Exception handling, which
+    # already records a structured job failure via core.failure.build_failure.
+    from services.tts_backend import resolve_generation_backend
+    backend = await resolve_generation_backend(
+        require_cloning=bool(job.get("voice_id")),
+        cloning_purpose="this batch job's pinned voice",
+    )
+    sr = backend.sample_rate
+
     # ── 3. Translate + Generate per language ───────────────────────────
     total_langs = len(langs)
     outputs = {}
@@ -243,13 +258,10 @@ async def _run_batch_pipeline(job_id: str, job: dict):
             total_segments=len(translated_segments),
         )
 
-        from services.model_manager import get_model
         from services.audio_dsp import apply_mastering, normalize_audio
         from services.audio_io import atomic_save_wav
         import torch
 
-        _model = await get_model()
-        sr = _model.sampling_rate
         total_samples = int(duration * sr)
         full_audio = torch.zeros(1, total_samples)
         total_segs = len(translated_segments)
@@ -295,22 +307,16 @@ async def _run_batch_pipeline(job_id: str, job: dict):
                         ref_text = row.get("ref_text")
 
                 try:
-                    audios = _model.generate(
+                    audio_out = backend.generate(
                         text=text, language=lang,
                         ref_audio=ref_audio, ref_text=ref_text,
                         duration=dur, num_step=16,
                         guidance_scale=2.0, speed=1.0,
                         denoise=True, postprocess_output=True,
                     )
-                    audio_out = audios[0]
-                    # TODO(#312): this route runs the OmniVoice model directly (not the active
-                    # backend), so VoxCPM2 never reaches it. When these routes become
-                    # engine-aware, guard with `if not getattr(backend, "applies_own_mastering", False)`.
-                    mastered = apply_mastering(
-                        audio_out,
-                        sample_rate=sr,
-                    )
-                    return normalize_audio(mastered, target_dBFS=-2.0)
+                    if not getattr(backend, "applies_own_mastering", False):
+                        audio_out = apply_mastering(audio_out, sample_rate=sr)
+                    return normalize_audio(audio_out, target_dBFS=-2.0)
                 except Exception as e:
                     logger.warning("TTS failed for seg %d (lang=%s): %s", i, lang, e)
                     return torch.zeros(1, int(dur * sr))

backend/api/routers/capture.py

@@ -120,6 +120,15 @@ async def transcribe_audio(
         from services.refinement import collapse_repetitive_artifacts
         full_text = collapse_repetitive_artifacts(full_text)
 
+        # Cross-transport parity: deterministically polish the final text
+        # (leading capital + terminal punctuation) exactly like the live
+        # dictation socket (capture_ws) does, so the widget's POST fallback and
+        # MCP/CLI callers get the same typed-looking result the WS returns —
+        # not the raw "...test" the REST path used to leak. Segments stay raw
+        # (their timings/verbatim recognition are the contract).
+        from services.text_polish import polish_text
+        full_text = polish_text(full_text)
+
         # Calculate audio duration from segments if available
         duration = 0.0
         if segments:
@@ -135,8 +144,12 @@ async def transcribe_audio(
         if _truthy(refine) and full_text:
             from services.refinement import maybe_refine
             refined = await asyncio.to_thread(maybe_refine, full_text)
-            if refined and refined != full_text:
-                refined_text = refined
+            if refined:
+                # Polish the refined text too, so both surfaced strings read as
+                # typed text (mirrors the raw-vs-refined contract of the WS).
+                refined = polish_text(refined)
+                if refined != full_text:
+                    refined_text = refined
 
         logger.info(
             "Capture transcription done: engine=%s, elapsed=%.2fs, duration=%.1fs, mode=%s, refined=%s",

backend/api/routers/capture_ws.py

@@ -19,7 +19,15 @@ Protocol:
          "segments": [...], "language": "en",
          "duration_s": 4.2, "transcription_time_s": 0.8,
          "engine": "mlx-whisper"}
-        {"type": "error",   "detail": "..."}              — error
+        {"type": "status",  "stage": "downloading"|"loading"|"ready"}
+                                                          — model cold-start
+        {"type": "error",   "message": "...", "kind": "...",
+         "detail": "..."}                                  — error ("detail"
+                                                          kept for legacy)
+
+    Every ``final`` text is normalised by services.text_polish (leading
+    capital for Latin scripts, terminal punctuation, single-spaced) so the
+    pasted result reads like typed text. Partials are raw.
 """
 from __future__ import annotations
 
@@ -32,6 +40,7 @@ import time
 from fastapi import APIRouter, WebSocket, WebSocketDisconnect
 
 from api.dependencies import _LOOPBACK_HOSTS, ws_remote_authorized
+from services.text_polish import polish_text
 
 router = APIRouter()
 logger = logging.getLogger("omnivoice.capture_ws")
@@ -302,20 +311,29 @@ async def ws_transcribe(websocket: WebSocket):
     if total_bytes > MIN_FINAL_BUFFER_BYTES:
         try:
             result = await _transcribe_buffer_full(audio_chunks, pcm_sr=pcm_sr)
+            # Dictation v2: deterministic polish so the pasted final reads
+            # like typed text (leading capital, terminal punctuation).
+            result["text"] = polish_text(result.get("text", ""))
             # Wave 2.1: optional local-LLM refinement of the final text.
-            # Off-thread (network call, not GPU); pass-through on any
-            # failure or when no LLM backend is configured. The raw text
-            # always ships too — clients paste refined_text ?? text.
+            # HARD-BOUNDED (maybe_refine_async, ~4s OMNIVOICE_REFINE_TIMEOUT_S):
+            # a slow/dead LLM can never delay this `final` beyond the budget —
+            # it falls back to the unrefined (but polished) text. Best-effort:
+            # never let refinement turn a good final into an error. The raw
+            # text always ships too — clients paste refined_text ?? text.
             if result.get("text"):
-                from services.refinement import maybe_refine
-                refined = await asyncio.to_thread(maybe_refine, result["text"])
-                if refined and refined != result["text"]:
-                    result["refined_text"] = refined
+                try:
+                    from services.refinement import maybe_refine_async
+                    refined = await maybe_refine_async(result["text"])
+                    if refined and refined != result["text"]:
+                        result["refined_text"] = refined
+                except Exception as e:  # noqa: BLE001
+                    logger.debug("Dictation refinement skipped: %s", e)
             if not await _safe_send({"type": "final", **result}):
                 logger.debug("Skipped final send — client already disconnected")
         except Exception as e:
             logger.error("Final transcription failed: %s", e)
-            await _safe_send({"type": "error", "detail": str(e)})
+            await _safe_send({"type": "error", "message": str(e),
+                              "kind": "transcribe", "detail": str(e)})
     else:
         await _safe_send({
             "type": "final",
@@ -340,10 +358,19 @@ async def ws_transcribe(websocket: WebSocket):
 # opt-in 1-byte type prefix when ?aec=1, else bare PCM) at ?sr= (default 16000).
 # This is the low-latency transport — no WebM/ffmpeg in the hot path.
 
-# How often the offline-kind handler re-decodes the growing buffer for a live
-# partial (streaming-kind decodes every frame, no cadence needed).
+# How often the offline-kind handler re-decodes the live window for a partial
+# (streaming-kind decodes every frame, no cadence needed).
 SHERPA_OFFLINE_PARTIAL_S = float(os.environ.get("OMNIVOICE_SHERPA_OFFLINE_PARTIAL", "0.8"))
 
+# Utterance gate for the offline-kind handler: once the trailing this-many
+# seconds of the live buffer fall below the RMS floor, the utterance is
+# COMMITTED — decoded, flushed as a `final`, and dropped from the buffer. Each
+# decode is thereby bounded by one utterance instead of the whole session
+# (the old full-buffer re-decode was O(n²)), and a sentence commits ~0.6s
+# after the user stops speaking instead of only at EOF.
+SHERPA_OFFLINE_SILENCE_S = float(os.environ.get("OMNIVOICE_SHERPA_OFFLINE_SILENCE", "0.6"))
+SHERPA_OFFLINE_RMS_FLOOR = float(os.environ.get("OMNIVOICE_SHERPA_OFFLINE_RMS", "0.01"))
+
 
 def _pcm16_to_f32(pcm: bytes):
     """int16 little-endian mono PCM bytes → float32 numpy in [-1, 1]."""
@@ -411,30 +438,64 @@ async def _recv_pcm_frame(websocket: WebSocket, aec):
     return "skip", b""
 
 
+async def _sherpa_load_with_status(websocket: WebSocket, backend, spec) -> bool:
+    """Build the recognizer off the event loop, narrating cold-start progress.
+
+    Sends ``{"type":"status","stage":"downloading"|"loading"}`` before the
+    load ("downloading" when the pinned assets aren't in the HF cache yet;
+    stage-only — HF's per-file progress isn't worth a callback plumb-through)
+    and ``{"type":"status","stage":"ready"}`` after, so the widget can show
+    *why* the first dictation takes a moment. Returns False when the load
+    failed (the error frame is sent and the socket closed here).
+    """
+    try:
+        from services import sherpa_dictation as _sd
+        stage = "loading" if _sd.is_installed(spec) else "downloading"
+    except Exception:
+        stage = "loading"
+    try:
+        await websocket.send_json({"type": "status", "stage": stage})
+    except Exception:
+        pass
+    try:
+        await asyncio.to_thread(backend.ensure_loaded)
+    except Exception as e:
+        logger.error("sherpa dictation load failed (%s): %s", spec.id, e)
+        try:
+            await websocket.send_json({"type": "error", "message": str(e),
+                                       "kind": "load", "detail": str(e)})
+            await websocket.close()
+        except Exception:
+            pass
+        return False
+    try:
+        await websocket.send_json({"type": "status", "stage": "ready"})
+    except Exception:
+        pass
+    return True
+
+
 async def _run_sherpa_streaming(websocket: WebSocket, spec):
     """True streaming: feed the OnlineRecognizer frame-by-frame, emit `partial`
     every time the decoded text grows, and `final` on sherpa's endpoint (silence)
     detection and on EOF. <300ms perceived latency on CPU for the tiny models.
     """
     import numpy as np
-    from services.asr_backend import SherpaDictationBackend
+    from services.asr_backend import get_sherpa_dictation_backend
 
     pcm_sr, aec = await _sherpa_session(websocket)
     logger.info("sherpa streaming dictation: model=%s sr=%d aec=%s",
                 spec.id, pcm_sr, bool(aec))
 
-    backend = SherpaDictationBackend(model_id=spec.id)
-    # Build the recognizer off the event loop (download-on-first-use + ONNX
-    # session init can take a moment); keep the socket responsive.
-    try:
-        await asyncio.to_thread(backend.ensure_loaded)
-    except Exception as e:
-        logger.error("sherpa streaming load failed: %s", e)
-        try:
-            await websocket.send_json({"type": "error", "detail": str(e)})
-            await websocket.close()
-        except Exception:
-            pass
+    # Reuse the shared, per-model warm backend (#888): the recognizer is built
+    # once and shared across sessions instead of rebuilt (1.3–2.5s) per connect,
+    # so the first dictation is instant when the preload warmed it. Each session
+    # still gets its own decode stream below.
+    backend = get_sherpa_dictation_backend(spec.id)
+    # Build the recognizer off the event loop if it isn't warm yet
+    # (download-on-first-use + ONNX session init can take a moment); status
+    # frames keep the widget honest.
+    if not await _sherpa_load_with_status(websocket, backend, spec):
         return
     rec = backend._rec
     stream = rec.create_stream()
@@ -484,7 +545,9 @@ async def _run_sherpa_streaming(websocket: WebSocket, spec):
                 continue
             text, endpoint = await asyncio.to_thread(_decode_after_feed, pcm)
             if endpoint:
-                # Commit this utterance; reset for the next one.
+                # Commit this utterance (polished — it gets pasted); reset
+                # for the next one.
+                text = polish_text(text)
                 if text:
                     committed.append(text)
                     await _send({"type": "final", "text": text,
@@ -507,16 +570,20 @@ async def _run_sherpa_streaming(websocket: WebSocket, spec):
     except Exception as e:
         logger.debug("sherpa streaming flush failed: %s", e)
         tail_text = ""
+    tail_text = polish_text(tail_text)
     if tail_text and tail_text != (committed[-1] if committed else None):
         committed.append(tail_text)
 
+    # Pieces are already polished; the join is too (polish is idempotent).
     full = " ".join(t for t in committed if t).strip()
     segments = [{"start": 0.0, "end": None, "text": t} for t in committed if t]
     if not client_disconnected:
         if full:
+            # Hard-bounded refinement (~4s): never delays this summary `final`
+            # beyond OMNIVOICE_REFINE_TIMEOUT_S even with a dead LLM endpoint.
             try:
-                from services.refinement import maybe_refine
-                refined = await asyncio.to_thread(maybe_refine, full)
+                from services.refinement import maybe_refine_async
+                refined = await maybe_refine_async(full)
             except Exception:
                 refined = None
             payload = {"type": "final", "text": full, "segments": segments,
@@ -534,32 +601,34 @@ async def _run_sherpa_streaming(websocket: WebSocket, spec):
 
 
 async def _run_sherpa_offline(websocket: WebSocket, spec):
-    """Offline-kind sherpa model with live partials: buffer raw PCM and
-    re-decode the growing buffer every ~800ms so the user still sees text
-    appear while speaking; finalize on EOF/silence."""
-    from services.asr_backend import SherpaDictationBackend
+    """Offline-kind sherpa model with live partials, utterance-windowed.
+
+    Raw PCM accumulates in a *live* buffer holding only the current
+    (uncommitted) utterance. Every ~800ms the live window is re-decoded for a
+    ``partial``; when the trailing ~0.6s of it fall below the RMS floor the
+    utterance is committed — decoded once more, flushed as a ``final``, and
+    its samples dropped — so per-partial cost is bounded by one utterance
+    (not the whole session) and sentences commit as the user pauses instead
+    of only at EOF."""
+    from services.asr_backend import get_sherpa_dictation_backend
 
     pcm_sr, aec = await _sherpa_session(websocket)
     logger.info("sherpa offline dictation: model=%s sr=%d aec=%s",
                 spec.id, pcm_sr, bool(aec))
 
-    backend = SherpaDictationBackend(model_id=spec.id)
-    try:
-        await asyncio.to_thread(backend.ensure_loaded)
-    except Exception as e:
-        logger.error("sherpa offline load failed: %s", e)
-        try:
-            await websocket.send_json({"type": "error", "detail": str(e)})
-            await websocket.close()
-        except Exception:
-            pass
+    # Shared, per-model warm backend (#888) — built once, reused per session.
+    backend = get_sherpa_dictation_backend(spec.id)
+    if not await _sherpa_load_with_status(websocket, backend, spec):
         return
 
-    buf = bytearray()
+    buf = bytearray()             # live (uncommitted) PCM only
+    committed: list[str] = []     # polished utterances already flushed
     last_partial = ""
     running = True
     client_disconnected = False
     last_audio = time.monotonic()
+    # Trailing-silence gate window, in bytes of int16 mono PCM.
+    sil_bytes = max(2, int(SHERPA_OFFLINE_SILENCE_S * pcm_sr) * 2)
 
     async def _send(payload) -> bool:
         nonlocal client_disconnected
@@ -572,8 +641,14 @@ async def _run_sherpa_offline(websocket: WebSocket, spec):
             client_disconnected = True
             return False
 
-    def _decode_buffer() -> str:
-        samples = _pcm16_to_f32(bytes(buf))
+    def _rms(pcm: bytes) -> float:
+        samples = _pcm16_to_f32(pcm)
+        if not len(samples):
+            return 0.0
+        return float((samples * samples).mean() ** 0.5)
+
+    def _decode_window(pcm: bytes) -> str:
+        samples = _pcm16_to_f32(pcm)
         if not len(samples):
             return ""
         return backend._decode_offline(samples, pcm_sr)
@@ -597,14 +672,43 @@ async def _run_sherpa_offline(websocket: WebSocket, spec):
             logger.debug("sherpa offline receive ended: %s", e)
             running = False
 
+    async def _commit(snapshot: bytes):
+        """Finalize one utterance: decode it off-thread, flush a polished
+        `final`, drop its samples from the live buffer. `receive()` may
+        append while we decode — only the snapshot's prefix is dropped."""
+        nonlocal last_partial
+        try:
+            text = await asyncio.to_thread(_decode_window, snapshot)
+        except Exception as e:
+            logger.debug("sherpa offline commit decode failed: %s", e)
+            return
+        del buf[:len(snapshot)]
+        last_partial = ""
+        text = polish_text(text)
+        if text:
+            committed.append(text)
+            await _send({"type": "final", "text": text,
+                         "segments": [{"start": 0.0, "end": None, "text": text}],
+                         "language": "auto", "engine": backend.id})
+
     async def partials():
         nonlocal last_partial, running
         while running:
             await asyncio.sleep(SHERPA_OFFLINE_PARTIAL_S)
             if not running or len(buf) < 2000:
                 continue
+            snapshot = bytes(buf)
+            if len(snapshot) > sil_bytes and \
+                    _rms(snapshot[-sil_bytes:]) < SHERPA_OFFLINE_RMS_FLOOR:
+                if _rms(snapshot[:-sil_bytes]) >= SHERPA_OFFLINE_RMS_FLOOR:
+                    await _commit(snapshot)
+                else:
+                    # Pure silence — drop it (keep the gate window for
+                    # continuity) so a long pause can't grow the buffer.
+                    del buf[:len(snapshot) - sil_bytes]
+                continue
             try:
-                text = await asyncio.to_thread(_decode_buffer)
+                text = await asyncio.to_thread(_decode_window, snapshot)
             except Exception as e:
                 logger.debug("sherpa offline partial failed: %s", e)
                 continue
@@ -624,20 +728,26 @@ async def _run_sherpa_offline(websocket: WebSocket, spec):
             except (asyncio.CancelledError, Exception):
                 pass
 
+    # Drain the trailing (un-committed) utterance on EOF.
     try:
-        full = await asyncio.to_thread(_decode_buffer)
+        tail = await asyncio.to_thread(_decode_window, bytes(buf))
     except Exception as e:
         logger.error("sherpa offline final failed: %s", e)
-        full = ""
-    full = (full or "").strip()
-    segments = [{"start": 0.0, "end": None, "text": full}] if full else []
+        tail = ""
+    tail = polish_text(tail)
+    if tail:
+        committed.append(tail)
+    # Pieces are already polished; the join is too (polish is idempotent).
+    full = " ".join(committed).strip()
+    segments = [{"start": 0.0, "end": None, "text": t} for t in committed]
     if not client_disconnected:
         payload = {"type": "final", "text": full, "segments": segments,
                    "language": "auto", "engine": backend.id}
         if full:
+            # Hard-bounded refinement (~4s) — never delays the `final`.
             try:
-                from services.refinement import maybe_refine
-                refined = await asyncio.to_thread(maybe_refine, full)
+                from services.refinement import maybe_refine_async
+                refined = await maybe_refine_async(full)
                 if refined and refined != full:
                     payload["refined_text"] = refined
             except Exception:

backend/api/routers/dub_core.py

@@ -16,6 +16,7 @@ from core.tasks import task_manager
 from core import event_bus
 from schemas.requests import DubIngestUrlRequest
 from services.model_manager import get_model, _gpu_pool, _cpu_pool, get_diarization_pipeline, offload_tts_for_asr, restore_tts_after_asr
+from services.asr_backend import ASRTimeoutError, reset_pool_after_wedge, run_transcribe_guarded
 from services.audio_io import _safe_soundfile_write
 from services.ffmpeg_utils import find_ffmpeg
 from services.segmentation import (
@@ -35,24 +36,6 @@ router = APIRouter()
 logger = logging.getLogger("omnivoice.api")
 
 
-def _reset_pool_on_wedge(pool) -> None:
-    """Abandon a GPU pool whose worker is wedged on a timed-out transcribe (#730).
-
-    Python can't kill the stuck thread, but dropping the poisoned pool means the
-    next submit (the next chunk, or a concurrent TTS generate) gets a fresh
-    worker instead of queueing behind the wedged one — the same recovery the
-    whole-file paths get inside ``run_transcribe_guarded``. Best-effort and a
-    no-op for a pool without ``reset`` (a plain executor), so it never raises on
-    the failure path it's trying to recover from.
-    """
-    _reset = getattr(pool, "reset", None)
-    if callable(_reset):
-        try:
-            _reset()
-        except Exception:
-            logger.exception("GPU pool reset after transcribe timeout failed")
-
-
 # ── Legacy-name aliases to services/dub_pipeline.py ────────────────────────
 # Phase 2.4 moved the business logic into a service. Other routers
 # (dub_generate, dub_translate, dub_export) + internal call sites below still
@@ -392,6 +375,31 @@ _CHUNK_TRANSCRIBE_ATTEMPTS = max(1, int(os.environ.get("OMNIVOICE_TRANSCRIBE_CHU
 _sse_event = dub_pipeline.sse_event
 _prep_event_helper = dub_pipeline.prep_event  # alias; we keep the module-local _prep_event below for the inline one-liner shape
 
+#: User-facing warning emitted when auto voice cloning is skipped because the
+#: speaker labels came from the silence-gap heuristic (see _diarize /
+#: extract_speaker_clones — gap-based labels routinely mix two people's audio
+#: into one reference, which is how "made up" clone voices happen).
+CLONE_SKIP_HEURISTIC_MSG = (
+    "auto voice cloning skipped: speaker labels are gap-based estimates — "
+    "set up diarization (Settings → Models → pyannote) for per-speaker clones"
+)
+
+
+def _clamp_num_speakers(value) -> Optional[int]:
+    """Clamp the user's speaker-count hint to a sane 1–20 range.
+
+    Shared by the SSE and legacy transcribe endpoints so the two can't drift.
+    None / non-int / out-of-range → None (auto-detect), so a bad query string
+    can never break a diarization call.
+    """
+    if value is None:
+        return None
+    try:
+        value = int(value)
+    except (TypeError, ValueError):
+        return None
+    return value if 1 <= value <= 20 else None
+
 
 @router.get("/dub/transcribe-stream/{job_id}")
 async def dub_transcribe_stream(
@@ -410,15 +418,14 @@ async def dub_transcribe_stream(
     pyannote auto-detects the count — but its auto-detect can collapse a
     multi-speaker clip to a single speaker (issue #274). When the user knows
     the exact count, supplying it forces pyannote to return that many speakers.
+    On paths that can't honor the hint exactly (inline ASR turns, the
+    silence-gap heuristic) it is never silently dropped: the heuristic cycles
+    the requested count and a `warning` SSE event tells the user how far the
+    labels can be trusted.
     """
     # Clamp to a sane range; ignore anything non-positive / absurd so a bad
     # query string can never break the diarization call. None → auto-detect.
-    if num_speakers is not None:
-        try:
-            num_speakers = int(num_speakers)
-            num_speakers = num_speakers if 1 <= num_speakers <= 20 else None
-        except (TypeError, ValueError):
-            num_speakers = None
+    num_speakers = _clamp_num_speakers(num_speakers)
 
     job = _get_job(job_id)
 
@@ -445,6 +452,11 @@ async def dub_transcribe_stream(
             asr_audio_target = job.get("vocals_path")
             if not asr_audio_target or not os.path.exists(asr_audio_target):
                 asr_audio_target = job.get("audio_path")
+            # #963: onset snapping is only trustworthy on the Demucs vocals
+            # track. When separation failed/was skipped, dub_pipeline sets
+            # vocals_path to the mixed audio_path — so compare paths instead
+            # of trusting the key's presence.
+            asr_on_vocals = bool(asr_audio_target) and asr_audio_target != job.get("audio_path")
             if not asr_audio_target or not os.path.exists(asr_audio_target):
                 preflight_error = "No audio available for transcription."
             else:
@@ -580,35 +592,38 @@ async def dub_transcribe_stream(
             # the hole instead of leaving silent gaps.
             part = None
             for _attempt in range(1, _CHUNK_TRANSCRIBE_ATTEMPTS + 1):
+                # A wedged chunk gets the SAME guarded-timeout + pool-reset
+                # semantics as the whole-file paths (#730/#851):
+                # run_transcribe_guarded bounds the call, abandons the poisoned
+                # pool so the retry (and any concurrent TTS work) gets a fresh
+                # worker, and raises the actionable ASRTimeoutError. Run it as
+                # a task and poll so we can keep yielding pings — the
+                # EventSource connection drops without them.
+                pool_reset_by_guard = False
+                task = asyncio.ensure_future(run_transcribe_guarded(
+                    _gpu_pool, _transcribe_chunk,
+                    what=f"Dub chunk {i + 1}/{chunks_n}",
+                    timeout=TRANSCRIBE_CHUNK_TIMEOUT_S,
+                    timeout_env="OMNIVOICE_TRANSCRIBE_CHUNK_TIMEOUT_S",
+                ))
+                while True:
+                    done, _pending = await asyncio.wait({task}, timeout=5.0)
+                    if done:
+                        break
+                    yield _sse_event("ping", {})
                 try:
-                    # wait_for in a loop to yield pings so the EventSource connection doesn't drop
-                    fut = loop.run_in_executor(_gpu_pool, _transcribe_chunk)
-                    waited = 0.0
-                    while True:
-                        done, pending = await asyncio.wait([fut], timeout=5.0)
-                        if done:
-                            part = done.pop().result()
-                            break
-                        yield _sse_event("ping", {})
-                        waited += 5.0
-                        if waited >= TRANSCRIBE_CHUNK_TIMEOUT_S:
-                            # Re-raise TimeoutError if we exceed the overall limit
-                            raise asyncio.TimeoutError()
-                except asyncio.TimeoutError:
+                    part = task.result()
+                except ASRTimeoutError as e:
+                    # The guard already reset the pool; keep the actionable
+                    # message (it names the durable fixes, and — after repeated
+                    # timeouts — the crash-isolated engine escape hatch).
+                    pool_reset_by_guard = True
                     logger.error(
                         "Transcribe chunk %d/%d timed out after %.0fs (attempt %d/%d, job=%s)",
                         i + 1, chunks_n, TRANSCRIBE_CHUNK_TIMEOUT_S, _attempt,
                         _CHUNK_TRANSCRIBE_ATTEMPTS, job_id,
                     )
-                    # #730: the wedged chunk thread keeps holding its GPU-pool
-                    # worker. Abandon the poisoned pool so the retry (and any TTS
-                    # work) gets a fresh worker instead of queueing behind it.
-                    _reset_pool_on_wedge(_gpu_pool)
-                    part = {
-                        "chunks": [], "language": None,
-                        "error": f"Chunk {i+1} timed out after {TRANSCRIBE_CHUNK_TIMEOUT_S:.0f}s — "
-                                 f"ASR backend may be stuck. Try restarting the server.",
-                    }
+                    part = {"chunks": [], "language": None, "error": str(e)}
                 # Success → keep it. Failure/timeout → retry once on a fresh
                 # worker (the internal _transcribe_chunk except returns an
                 # error-part; the timeout path already reset the pool).
@@ -619,7 +634,9 @@ async def dub_transcribe_stream(
                         "Retrying transcribe chunk %d/%d after failure/timeout (next attempt %d/%d, job=%s)",
                         i + 1, chunks_n, _attempt + 1, _CHUNK_TRANSCRIBE_ATTEMPTS, job_id,
                     )
-                    _reset_pool_on_wedge(_gpu_pool)
+                    if not pool_reset_by_guard:
+                        reset_pool_after_wedge(
+                            _gpu_pool, what=f"Dub chunk {i + 1}/{chunks_n}")
             if part.get("error"):
                 chunk_errors.append(part["error"])
                 logger.warning("Chunk %d/%d error: %s", i + 1, chunks_n, part["error"])
@@ -637,12 +654,19 @@ async def dub_transcribe_stream(
             # leading music/silence (classic case: speech begins at 0:03,
             # transcript says 0.0 → the dub plays 3 s early). Snap starts
             # forward to the actual speech onset. `audio_np` is the same
-            # track ASR ran on — vocals.wav when Demucs succeeded.
+            # track ASR ran on — vocals.wav when Demucs succeeded. #963:
+            # when it didn't (mixed audio), snapping is disabled — every
+            # footstep/sigh/score cue is a false onset candidate there.
             try:
-                snap_segment_starts(chunk_segs, audio_np, sr)
+                snap_segment_starts(chunk_segs, audio_np, sr,
+                                    separated_vocals=asr_on_vocals)
             except Exception as e:
                 logger.warning("onset alignment skipped for chunk %d: %s", i, e)
-            chunk_segs = assign_speakers_heuristic(chunk_segs)
+            # Provisional per-chunk labels for the streaming UI only — the
+            # final diarization pass below overwrites them. Honor the user's
+            # speaker-count hint here too so the interim view doesn't flip
+            # between 2 and N speakers.
+            chunk_segs = assign_speakers_heuristic(chunk_segs, num_speakers)
             for s in chunk_segs:
                 s["id"] = f"s{next_seg_id:05x}"
                 s["text_original"] = s.get("text", "")
@@ -696,33 +720,110 @@ async def dub_transcribe_stream(
             return
 
         def _diarize():
-            """Returns (segments, warning_payload_or_None).
+            """Returns (segments, warning_payload_or_None, labels_source).
+
+            `labels_source` records where the speaker labels came from —
+            `"pyannote"` | `"turns"` | `"heuristic"` — so downstream
+            auto-clone extraction can refuse to cut reference audio from
+            gap-based estimates (a mixed-speaker reference is how "made up"
+            clone voices happen).
 
             `warning_payload` is a structured dict
             `{detail, error_class, docs_url}` whenever we silently fell back
             to the silence-gap heuristic (no HF_TOKEN, model unavailable,
-            license not accepted, or pyannote raised). The heuristic only
-            detects speaker turns from >1.2s silences, so a rapid-fire
-            man↔woman exchange will read as one speaker. Issue #78 — we
-            attach an `error_class` so the front-end's errorDocsMap can
-            render a "See docs" deeplink instead of a dead-end toast.
+            license not accepted, or pyannote raised) — or whenever the
+            user's `num_speakers` hint could not be honored exactly. The
+            heuristic only detects speaker turns from >1.2s silences, so a
+            rapid-fire man↔woman exchange will read as one speaker. Issue
+            #78 — we attach an `error_class` so the front-end's errorDocsMap
+            can render a "See docs" deeplink instead of a dead-end toast.
             """
-            # The active ASR backend already diarized inline (FunASR cam++):
-            # use its speaker turns directly and skip pyannote entirely (#182).
-            if asr_speaker_turns:
-                logger.info("Using inline ASR diarization (%d turns); skipping pyannote.", len(asr_speaker_turns))
-                assigned = assign_speakers_from_turns(all_segments, asr_speaker_turns)
-                # #486: split any segment that spans two speakers' turns at the
-                # word boundary (single-speaker segments pass through unchanged).
-                return resplit_segments_by_turns(assigned, all_words, asr_speaker_turns), None
-
             from services.model_manager import (
                 DIARIZATION_ERR_LICENSE,
                 DIARIZATION_ERR_NO_TOKEN,
             )
             from core import error_docs_map
 
-            diar_pipe, err_sentinel = get_diarization_pipeline(return_error=True)
+            def _hint_suffix() -> str:
+                """Honest caveat appended to heuristic-fallback warnings when a
+                multi-speaker hint is set: the count is now honored, but the
+                heuristic can't attribute voices. (A hint of 1 IS fully
+                honored — one label — so it needs no caveat.)"""
+                if not num_speakers or num_speakers < 2:
+                    return ""
+                return (
+                    f" Your speaker-count setting ({num_speakers}) is only "
+                    f"approximately honored: the heuristic cycles "
+                    f"{num_speakers} speaker labels on silence gaps instead "
+                    f"of recognizing voices, so lines may be attributed to "
+                    f"the wrong speaker."
+                )
+
+            def _use_turns(crash: Exception | None = None, err_sentinel=None):
+                """Label from the ASR backend's inline speaker turns; warn when
+                that means the user's explicit count can't be enforced."""
+                logger.info(
+                    "Using inline ASR diarization (%d turns)%s.",
+                    len(asr_speaker_turns),
+                    "" if crash else "; skipping pyannote",
+                )
+                assigned = assign_speakers_from_turns(all_segments, asr_speaker_turns)
+                # #486: split any segment that spans two speakers' turns at the
+                # word boundary (single-speaker segments pass through unchanged).
+                resplit = resplit_segments_by_turns(assigned, all_words, asr_speaker_turns)
+                if not num_speakers:
+                    return resplit, None, "turns"
+                error_class = (
+                    "HF_AUTH_FAILED"
+                    if err_sentinel == DIARIZATION_ERR_NO_TOKEN
+                    else "PYANNOTE_LICENSE_REQUIRED"
+                )
+                if crash:
+                    detail = (
+                        f"Speaker diarization crashed mid-run "
+                        f"({type(crash).__name__}); falling back to the ASR "
+                        f"engine's built-in speaker turns. Speaker-count hint "
+                        f"ignored: the detected count may differ from the "
+                        f"{num_speakers} you set."
+                    )
+                else:
+                    detail = (
+                        f"Speaker-count hint ignored: pyannote diarization is "
+                        f"unavailable, so the ASR engine's built-in speaker "
+                        f"turns were used and the detected count may differ "
+                        f"from the {num_speakers} you set. Set up diarization "
+                        f"(Settings → Models → pyannote) to enforce an exact "
+                        f"speaker count."
+                    )
+                return resplit, {
+                    "detail": detail,
+                    "error_class": error_class,
+                    "docs_url": error_docs_map.lookup(error_class),
+                    "speaker_hint": {"requested": num_speakers, "status": "ignored"},
+                }, "turns"
+
+            # The active ASR backend already diarized inline (FunASR cam++):
+            # its turns are the fast path and skip pyannote entirely (#182) —
+            # but ONLY when the user didn't set an explicit speaker count.
+            # Inline turns are labeled per-30s-chunk and can't be forced to N
+            # speakers, so a set num_speakers prefers pyannote — the one
+            # engine that honors an exact count. When pyannote can't load,
+            # the turns are still the best labels available; use them and say
+            # so instead of silently eating the hint.
+            diar_pipe = None
+            err_sentinel = None
+            if asr_speaker_turns:
+                if num_speakers:
+                    diar_pipe, err_sentinel = get_diarization_pipeline(return_error=True)
+                if not diar_pipe:
+                    return _use_turns(err_sentinel=err_sentinel)
+                logger.info(
+                    "num_speakers=%d set: preferring pyannote over %d inline "
+                    "ASR turns (only pyannote honors an exact count).",
+                    num_speakers, len(asr_speaker_turns),
+                )
+            else:
+                diar_pipe, err_sentinel = get_diarization_pipeline(return_error=True)
             if not diar_pipe:
                 # Phase 1 AUTH-01: ask the resolver (App → Env → HF-CLI),
                 # not just the env var. This is the #35 fix — users who
@@ -773,13 +874,20 @@ async def dub_transcribe_stream(
                         f"heuristic; rapid speaker turns may be merged."
                     )
                     error_class = "PYANNOTE_LICENSE_REQUIRED"
+                warning = {
+                    "detail": detail + _hint_suffix(),
+                    "error_class": error_class,
+                    "docs_url": error_docs_map.lookup(error_class),
+                }
+                if num_speakers:
+                    warning["speaker_hint"] = {
+                        "requested": num_speakers,
+                        "status": "approximate" if num_speakers > 1 else "honored",
+                    }
                 return (
-                    assign_speakers_heuristic(all_segments),
-                    {
-                        "detail": detail,
-                        "error_class": error_class,
-                        "docs_url": error_docs_map.lookup(error_class),
-                    },
+                    assign_speakers_heuristic(all_segments, num_speakers),
+                    warning,
+                    "heuristic",
                 )
             try:
                 # Pass the user's speaker-count hint through to pyannote when
@@ -794,9 +902,14 @@ async def dub_transcribe_stream(
                 assigned = assign_speakers_from_diarization(all_segments, diar)
                 # #486: split any segment that spans two speakers' turns at the
                 # word boundary (single-speaker segments pass through unchanged).
-                return resplit_segments_by_diarization(assigned, all_words, diar), None
+                return resplit_segments_by_diarization(assigned, all_words, diar), None, "pyannote"
             except Exception as e:
                 logger.error(f"Diarization failed: {e}")
+                # Inline ASR turns beat the silence-gap heuristic as a crash
+                # fallback (this path is reachable with turns present since a
+                # set num_speakers routes turns-jobs through pyannote).
+                if asr_speaker_turns:
+                    return _use_turns(crash=e)
                 # Mid-run failure — classify against the same sentinels so a
                 # post-load 401 (rare but possible after a token rotation)
                 # still gets the right docs deeplink.
@@ -807,36 +920,50 @@ async def dub_transcribe_stream(
                     if err_class_post == DIARIZATION_ERR_LICENSE
                     else "PYANNOTE_LICENSE_REQUIRED"  # LOAD failures land here too
                 )
+                warning = {
+                    "detail": (
+                        f"Speaker diarization crashed mid-run "
+                        f"({type(e).__name__}); falling back to a silence-gap "
+                        f"heuristic. Rapid speaker turns may be merged."
+                        + _hint_suffix()
+                    ),
+                    "error_class": error_class,
+                    "docs_url": error_docs_map.lookup(error_class),
+                }
+                if num_speakers:
+                    warning["speaker_hint"] = {
+                        "requested": num_speakers,
+                        "status": "approximate" if num_speakers > 1 else "honored",
+                    }
                 return (
-                    assign_speakers_heuristic(all_segments),
-                    {
-                        "detail": (
-                            f"Speaker diarization crashed mid-run "
-                            f"({type(e).__name__}); falling back to a silence-gap "
-                            f"heuristic. Rapid speaker turns may be merged."
-                        ),
-                        "error_class": error_class,
-                        "docs_url": error_docs_map.lookup(error_class),
-                    },
+                    assign_speakers_heuristic(all_segments, num_speakers),
+                    warning,
+                    "heuristic",
                 )
 
         fut_diar = loop.run_in_executor(_gpu_pool, _diarize)
         final_segs = None
         diar_warning = None
+        labels_source = "heuristic"
         while True:
             done, pending = await asyncio.wait([fut_diar], timeout=5.0)
             if done:
-                final_segs, diar_warning = done.pop().result()
+                final_segs, diar_warning, labels_source = done.pop().result()
                 break
             yield _sse_event("ping", {})
         if diar_warning:
             logger.warning("diarization fallback: %s", diar_warning.get("detail"))
-            yield _sse_event("warning", {
+            payload = {
                 "detail": diar_warning.get("detail"),
                 "source": "diarization",
                 "error_class": diar_warning.get("error_class"),
                 "docs_url": diar_warning.get("docs_url"),
-            })
+            }
+            # Machine-readable trail of what happened to the user's
+            # speaker-count hint (the `detail` text carries the human story).
+            if diar_warning.get("speaker_hint"):
+                payload["speaker_hint"] = diar_warning["speaker_hint"]
+            yield _sse_event("warning", payload)
 
         job["segments"] = final_segs
 
@@ -848,17 +975,37 @@ async def dub_transcribe_stream(
         try:
             from services.speaker_clone import extract_speaker_clones, auto_profile_id
             vocals_for_clone = job.get("vocals_path") or asr_audio_target
-            fut_clones = loop.run_in_executor(
-                _cpu_pool, extract_speaker_clones,
-                vocals_for_clone, final_segs, os.path.dirname(vocals_for_clone),
-            )
-            clones = None
-            while True:
-                done, pending = await asyncio.wait([fut_clones], timeout=5.0)
-                if done:
-                    clones = done.pop().result()
-                    break
-                yield _sse_event("ping", {})
+            clones = {}
+            if labels_source == "heuristic":
+                # Clone-purity guard: heuristic labels are silence-gap
+                # estimates, not voice identity — a per-speaker reference cut
+                # from them routinely concatenates two people's audio and the
+                # clone sounds "made up". Skip auto-clones and say so instead
+                # of shipping bad ones. (extract_speaker_clones enforces the
+                # same guard internally; this branch exists to surface the
+                # warning to the user.)
+                logger.info(
+                    "auto speaker clones skipped (labels_source=heuristic, job=%s)",
+                    job_id,
+                )
+                yield _sse_event("warning", {
+                    "detail": CLONE_SKIP_HEURISTIC_MSG,
+                    "source": "speaker_clone",
+                })
+            else:
+                fut_clones = loop.run_in_executor(
+                    _cpu_pool, lambda: extract_speaker_clones(
+                        vocals_for_clone, final_segs,
+                        os.path.dirname(vocals_for_clone),
+                        labels_source=labels_source,
+                    ),
+                )
+                while True:
+                    done, pending = await asyncio.wait([fut_clones], timeout=5.0)
+                    if done:
+                        clones = done.pop().result()
+                        break
+                    yield _sse_event("ping", {})
             # Wave 3.2: per-segment clone refs. Cut each long-enough segment's
             # own reference from the vocals so the dub of each line matches the
             # prosody of its source line. Short lines fall back to the
@@ -972,18 +1119,28 @@ async def dub_transcribe_stream(
 
 
 @router.post("/dub/transcribe/{job_id}")
-async def dub_transcribe(job_id: str):
+async def dub_transcribe(job_id: str, num_speakers: Optional[int] = None):
+    """Legacy synchronous transcribe (kept for the headless CLI).
+
+    `num_speakers` mirrors the SSE endpoint's query param (same 1–20 clamp):
+    an exact speaker count forwarded to pyannote, or cycled by the silence-gap
+    heuristic when pyannote is unavailable. None → auto-detect.
+    """
+    num_speakers = _clamp_num_speakers(num_speakers)
     job = _get_job(job_id)
     if not job:
         raise HTTPException(status_code=404, detail="Job not found")
     _model = await get_model()
 
     def _transcribe():
-        
+
         asr_audio_target = job.get("vocals_path")
         if not asr_audio_target or not os.path.exists(asr_audio_target):
             asr_audio_target = job.get("audio_path")
-            
+        # #963: same source-awareness as the SSE endpoint — vocals_path
+        # falls back to the mixed audio_path when Demucs failed/skipped.
+        asr_on_vocals = bool(asr_audio_target) and asr_audio_target != job.get("audio_path")
+
         import torch
 
         detected_lang = None
@@ -1027,10 +1184,13 @@ async def dub_transcribe(job_id: str):
         segments = segment_transcript(result, duration=job.get("duration", 0.0), scene_cuts=scene_cuts)
 
         # #280: snap segment starts forward to the actual speech onset so the
-        # dub doesn't begin seconds before the original speaker does.
+        # dub doesn't begin seconds before the original speaker does. #963:
+        # only on the separated vocals track — on mixed audio every ambient
+        # sound is a false onset candidate, so snapping is disabled.
         try:
             audio_for_onset, onset_sr = sf.read(asr_audio_target, dtype="float32")
-            snap_segment_starts(segments, audio_for_onset, onset_sr)
+            snap_segment_starts(segments, audio_for_onset, onset_sr,
+                                separated_vocals=asr_on_vocals)
         except Exception as e:
             logger.warning("onset alignment skipped: %s", e)
 
@@ -1038,13 +1198,20 @@ async def dub_transcribe(job_id: str):
         if diar_pipe:
             try:
                 diar_target = job.get("vocals_path") or job.get("audio_path")
-                diarization = diar_pipe(diar_target)
+                # Same hint pass-through as the SSE endpoint (#274): omit the
+                # kwarg entirely when unset so we don't depend on it existing
+                # in every pyannote build.
+                if num_speakers:
+                    logger.info("Diarizing with num_speakers=%d (user hint)", num_speakers)
+                    diarization = diar_pipe(diar_target, num_speakers=num_speakers)
+                else:
+                    diarization = diar_pipe(diar_target)
                 segments = assign_speakers_from_diarization(segments, diarization)
             except Exception as e:
                 logger.error(f"Pyannote diarization failed during inference: {e}. Falling back to heuristic.")
-                segments = assign_speakers_heuristic(segments)
+                segments = assign_speakers_heuristic(segments, num_speakers)
         else:
-            segments = assign_speakers_heuristic(segments)
+            segments = assign_speakers_heuristic(segments, num_speakers)
 
         # Previously ran `segment_for_subtitles(segments)` here. Removed 2026-04-21 —
         # that splitter enforces Netflix's 17 CPS reading-speed ceiling which
@@ -1068,7 +1235,6 @@ async def dub_transcribe(job_id: str):
             # call would otherwise hold its GPU-pool worker forever and starve
             # every other request into a "can't reach backend". run_transcribe_guarded
             # also resets the pool on timeout so capacity is restored.
-            from services.asr_backend import run_transcribe_guarded
             segments_result = await run_transcribe_guarded(_gpu_pool, _transcribe, what="Dub")
         except asyncio.CancelledError:
             job["aborted"] = True

backend/api/routers/dub_export.py

@@ -170,8 +170,42 @@ async def dub_list_tracks(job_id: str):
     return {"tracks": job.get("dubbed_tracks", {})}
 
 
+def _segments_for_lang(job: dict, lang: "str | None") -> list:
+    """Job segments with `text` overlaid from ``job["segments_i18n"][lang]``.
+
+    P1.2 — ``job["segments"]`` is single-slot: it holds whichever language was
+    generated LAST, so exporting subtitles for track A after generating track B
+    emitted B's text under A's language label (the "N identical subtitle
+    files" class). ``segments_i18n`` ({lang: {segKey: text}}, written by
+    ``dub_generate._sync_job_segments``) preserves each generated track's text;
+    this overlays it non-destructively when present.
+
+    Back-compat: no lang requested, no ``segments_i18n`` on the job (predates
+    the field), no entry for this lang, or no text for a given segment — each
+    falls back to the segment as-is, i.e. exactly today's behaviour.
+    Segment keys are the stable id (str) with the list index (str) as the
+    legacy fallback, mirroring how the map is written.
+    """
+    segments = job.get("segments", [])
+    if not lang:
+        return segments
+    i18n = job.get("segments_i18n")
+    lang_texts = i18n.get(lang) if isinstance(i18n, dict) else None
+    if not isinstance(lang_texts, dict) or not lang_texts:
+        return segments
+    out = []
+    for i, seg in enumerate(segments):
+        key = str(seg.get("id")) if seg.get("id") is not None else str(i)
+        txt = lang_texts.get(key)
+        if txt is None:
+            txt = lang_texts.get(str(i))
+        out.append(dict(seg, text=txt) if isinstance(txt, str) and txt.strip() else seg)
+    return out
+
+
 def _write_burn_srt(job: dict, exports_dir: str, stamp: str, dual: bool,
-                    fitted_segments: "list[dict] | None" = None) -> str | None:
+                    fitted_segments: "list[dict] | None" = None,
+                    lang: "str | None" = None) -> str | None:
     """Build a temp SRT from job segments for use with ffmpeg's subtitles filter.
 
     Returned path is already ffmpeg-filter-safe (plain ASCII basename under exports_dir).
@@ -181,8 +215,11 @@ def _write_burn_srt(job: dict, exports_dir: str, stamp: str, dual: bool,
     fitted timeline — when provided, cue times come from there instead of
     the original ``job["segments"]`` timings, so burned subs track the
     retimed video / fitted audio rather than the source timeline.
+
+    ``lang`` (P1.2): burn the named track's text (see ``_segments_for_lang``)
+    instead of whatever language generated last.
     """
-    segments = job.get("segments", [])
+    segments = _segments_for_lang(job, lang)
     if not segments:
         return None
     if fitted_segments:
@@ -486,7 +523,9 @@ async def dub_download(
     # Smart Fit: cue times come from the fitted timeline — that's where the
     # dubbed audio actually sits, whether or not the video retime succeeds.
     fitted_segments = _fitted_segments_for(job, default_track) if default_track and default_track != "original" else None
-    sub_path = _write_burn_srt(job, exports_dir, stamp, dual, fitted_segments=fitted_segments) if burn_subs else None
+    # Burn the DEFAULT track's text (P1.2) — it's the audio the viewer hears.
+    _burn_lang = default_track if default_track and default_track != "original" else None
+    sub_path = _write_burn_srt(job, exports_dir, stamp, dual, fitted_segments=fitted_segments, lang=_burn_lang) if burn_subs else None
 
     # ── Smart Fit video retime (two-tier) ─────────────────────────────────
     # Tier 1 (≤48 chunks): single filter_complex graph inlined into the mux
@@ -1125,20 +1164,40 @@ async def dub_get_audio(job_id: str):
         raise HTTPException(status_code=404, detail="Audio file not found")
     return FileResponse(audio, media_type="audio/wav")
 
+def _seg_wav_candidates(job: dict, lang: "str | None", seg_keys: tuple) -> list:
+    """Per-segment WAV name candidates, language-keyed first (P1.3).
+
+    Generation writes ``seg_{lang}_{id}.wav`` now; ``lang`` defaults to the
+    job's last-generated track. Legacy un-keyed names (``seg_{id}.wav`` /
+    ``seg_{index}.wav``) stay as fallbacks so jobs rendered by previous
+    builds keep serving their audio — these read-only endpoints keep the
+    permissive fallback that matches their historic behaviour (the strict
+    single-track gate lives on the generate splice path, where a wrong-
+    language read would be baked into a track).
+    """
+    lang = lang or job.get("language_code")
+    keys = []
+    if lang:
+        keys.extend(f"{lang}_{k}" for k in seg_keys)
+    keys.extend(seg_keys)
+    return keys
+
+
 @router.get("/dub/preview/{job_id}/{segment_index}")
-async def dub_preview_segment(job_id: str, segment_index: int):
+async def dub_preview_segment(job_id: str, segment_index: int, lang: str = Query(None)):
     job = _get_job(job_id)
     if not job:
         raise HTTPException(status_code=404, detail="Job not found")
-    # Resolve the stable-id-named WAV via the render manifest; fall back to the
-    # legacy index name for jobs rendered before id-based naming (#185). Each
-    # candidate is realpath-normalised and containment-checked BEFORE any
-    # filesystem access, so the guard dominates every path sink.
+    # Resolve the stable-id-named WAV via the render manifest — language-keyed
+    # name first (P1.3), then the legacy id/index names for jobs rendered
+    # before per-language (and before id-based, #185) naming. Each candidate
+    # is realpath-normalised and containment-checked BEFORE any filesystem
+    # access, so the guard dominates every path sink.
     order = job.get("seg_order") or []
     seg_id = order[segment_index] if 0 <= segment_index < len(order) else segment_index
     base = os.path.realpath(DUB_DIR)
     seg_path = None
-    for _sid in (seg_id, segment_index):
+    for _sid in _seg_wav_candidates(job, lang, (seg_id, segment_index)):
         cand = os.path.realpath(dub_seg_path(job_id, _sid))
         if cand.startswith(base + os.sep) and os.path.exists(cand):
             seg_path = cand
@@ -1342,13 +1401,16 @@ def _fitted_cue_times(job: dict, lang: str | None) -> list | None:
 async def dub_export_srt(
     job_id: str,
     dual: bool = False,
-    lang: str = Query(None, description="Track language code. When that track was generated under Smart Fit or stretch_video, cue times come from the fitted timeline."),
+    lang: str = Query(None, description="Track language code. Emits that track's text (segments_i18n) when the job carries it; when that track was generated under Smart Fit or stretch_video, cue times come from the fitted timeline."),
 ):
     job = _get_job(job_id)
     if not job:
         raise HTTPException(status_code=404, detail="Job not found")
 
-    segments = job.get("segments", [])
+    # P1.2 — text follows the REQUESTED track, not whichever language was
+    # generated last (job["segments"] is single-slot). Legacy jobs without
+    # segments_i18n fall back to today's behaviour.
+    segments = _segments_for_lang(job, lang)
     if not segments:
         raise HTTPException(status_code=400, detail="No transcript segments available")
 
@@ -1391,13 +1453,14 @@ def _format_vtt_time(seconds):
 async def dub_export_vtt(
     job_id: str,
     dual: bool = False,
-    lang: str = Query(None, description="Track language code. When that track was generated under Smart Fit or stretch_video, cue times come from the fitted timeline."),
+    lang: str = Query(None, description="Track language code. Emits that track's text (segments_i18n) when the job carries it; when that track was generated under Smart Fit or stretch_video, cue times come from the fitted timeline."),
 ):
     job = _get_job(job_id)
     if not job:
         raise HTTPException(status_code=404, detail="Job not found")
 
-    segments = job.get("segments", [])
+    # Same per-track text resolution as /dub/srt (see comment there, P1.2).
+    segments = _segments_for_lang(job, lang)
     if not segments:
         raise HTTPException(status_code=400, detail="No transcript segments available")
 
@@ -1427,7 +1490,7 @@ async def dub_export_vtt(
 
 
 @router.get("/dub/export-segments/{job_id}")
-async def dub_export_segments_zip(job_id: str):
+async def dub_export_segments_zip(job_id: str, lang: str = Query(None)):
     import zipfile
     job = _get_job(job_id)
     if not job:
@@ -1445,7 +1508,7 @@ async def dub_export_segments_zip(job_id: str):
             seg_id = order[i] if i < len(order) else i
             # realpath + containment guard before any filesystem access.
             seg_path = None
-            for _sid in (seg_id, i):
+            for _sid in _seg_wav_candidates(job, lang, (seg_id, i)):
                 cand = os.path.realpath(dub_seg_path(job_id, _sid))
                 if cand.startswith(base + os.sep) and os.path.exists(cand):
                     seg_path = cand

backend/api/routers/dub_generate.py

@@ -11,7 +11,8 @@ from core.db import db_conn
 from core.config import DUB_DIR, VOICES_DIR, dub_seg_path
 from core.tasks import task_manager
 from schemas.requests import DubRequest
-from services.model_manager import get_model, _gpu_pool, run_on_gpu_pool_guarded
+from services.model_manager import _gpu_pool, run_on_gpu_pool_guarded
+from services.tts_backend import resolve_generation_backend
 from services.audio_dsp import apply_mastering, normalize_audio, apply_effects_chain, get_effect_chain
 from services.audio_io import atomic_save_wav, _safe_torchaudio_save
 from services.ffmpeg_utils import (
@@ -87,6 +88,62 @@ def _sync_job_segments(job: dict, req: DubRequest) -> None:
         merged.append(row)
     job["segments"] = merged
 
+    # P1.2 — per-language text, additively. `job["segments"]` stays the flat
+    # single-slot map every existing consumer reads (last generated language);
+    # `job["segments_i18n"]` preserves EACH generated track's text so
+    # /dub/srt|vtt?lang= can emit that language instead of N identical files.
+    # Shape: { langCode: { segKey: text } } where segKey is the segment's
+    # stable id (str) or, for id-less legacy segments, its list index (str).
+    # The whole per-language map is rebuilt on every generate of that language
+    # (the request always carries the full segment list), so deleted segments
+    # never linger. Jobs predating this field simply lack it — every reader
+    # falls back to `job["segments"]`.
+    lang = (req.language_code or "und").strip() or "und"
+    i18n = job.setdefault("segments_i18n", {})
+    i18n[lang] = {
+        (str(row["id"]) if row.get("id") is not None else str(i)): row["text"]
+        for i, row in enumerate(merged)
+    }
+
+
+def _seg_hashes_by_lang(job: dict) -> dict:
+    """Per-language segment fingerprints: { langCode: { segId: hash } }.
+
+    Additive migration (P1.3): jobs written by previous builds carry ONE flat
+    `seg_hashes` map that was overwritten by whichever language generated
+    last. That flat map can only describe the job's last-generated track, so
+    it is attributed to `job["language_code"]` (which generate has always
+    kept in lock-step with the last run). When even that is unknown the
+    legacy hashes are dropped — segments then read as stale and regenerate
+    cleanly, which is safer than guessing a language and splicing wrong-track
+    audio. Note the legacy hashes also predate language-scoped fingerprints
+    (see services.incremental.segment_fingerprint), so they compare stale
+    once regardless — carrying them over just preserves the job shape.
+    """
+    by_lang = job.get("seg_hashes_by_lang")
+    if not isinstance(by_lang, dict):
+        by_lang = {}
+        legacy = job.get("seg_hashes")
+        prev_lang = job.get("language_code")
+        if isinstance(legacy, dict) and legacy and prev_lang:
+            by_lang[prev_lang] = dict(legacy)
+        job["seg_hashes_by_lang"] = by_lang
+    return by_lang
+
+
+def _legacy_seg_cache_ok(job: dict, lang_code: str) -> bool:
+    """May this run reuse legacy un-keyed ``seg_<id>.wav`` files?
+
+    Only when no OTHER language's audio could be sitting in them: the job has
+    no dubbed track in a different language. Single-language jobs rendered by
+    previous builds therefore keep their whole on-disk cache; the moment a
+    job carries a second language the un-keyed files are ambiguous (they hold
+    whichever language wrote them last) and must never be spliced into a
+    track again — the P1.3 cross-contamination class.
+    """
+    tracks = job.get("dubbed_tracks") or {}
+    return not any(lc != lang_code for lc in tracks)
+
 
 router = APIRouter()
 
@@ -100,13 +157,37 @@ async def dub_generate(job_id: str, req: DubRequest):
             detail="This dub session has expired or was never created. Re-upload the video to start a new one.",
         )
 
-    _model = await get_model()
+    # ── Engine resolution (issue #312 class) ────────────────────────────────
+    # Dub used to hardcode OmniVoice via get_model() regardless of the engine
+    # selected in Settings → Engines — a SILENT fallback. Every real dub
+    # segment's ref_audio resolves to either an auto:<speaker>/auto-seg:<id>
+    # clone cut from the source video or a saved voice-profile row (see
+    # `_gen` below), so require_cloning=True: an engine that can't clone
+    # would either mis-clone per segment or fail deep into the job. Checked
+    # ONCE here, before the streaming task starts, so a doomed job fails fast
+    # with one clear message instead of N per-segment ones.
+    try:
+        backend = await resolve_generation_backend(require_cloning=True)
+    except ValueError as e:
+        raise HTTPException(status_code=400, detail=str(e))
 
     async def _stream(task_id):
         total = len(req.segments)
         all_segment_wavs = []
         sync_scores = []
 
+        # Track language for this run. Everything per-track — the per-segment
+        # WAV cache, fingerprints, seg_wav_kind — is keyed by it (P1.3) so a
+        # multi-language job's tracks can't cross-contaminate.
+        lang_code = req.language_code or "und"
+
+        def _seg_lang_path(seg_key) -> str:
+            # Per-language per-segment WAV: seg_{lang}_{id}.wav. Built through
+            # dub_seg_path so the sanitisation + DUB_DIR containment guard
+            # apply to the combined key. Legacy un-keyed seg_{id}.wav files
+            # remain readable via the gated fallback (_legacy_seg_cache_ok).
+            return dub_seg_path(job_id, f"{lang_code}_{seg_key}")
+
         # Throttle the device cache flush. empty_cache() is a synchronous
         # device stall, so calling it every segment (as the old code did)
         # serialised the GPU loop; the batched-I/O design it replaced kept
@@ -236,7 +317,16 @@ async def dub_generate(job_id: str, req: DubRequest):
         # double-compress. Force one full regen; afterwards seg_wav_kind is
         # "natural" and partial regen / fit-only re-mix (regen_only=[]) work.
         # Jobs predating this field have unknown kind → also regen once.
-        if strategy == "smart_fit" and regen_only is not None and job.get("seg_wav_kind") != "natural":
+        # P1.3: the kind is per-track now (each language renders under its own
+        # strategy); the flat job["seg_wav_kind"] is only consulted for jobs
+        # written before the per-language map existed — once the map is
+        # present, a language without an entry has unknown-kind WAVs (or none
+        # at all) and must regen once, exactly like the pre-field case.
+        _kind_map = job.get("seg_wav_kind_by_lang")
+        _wav_kind = (
+            _kind_map.get(lang_code) if isinstance(_kind_map, dict) else job.get("seg_wav_kind")
+        )
+        if strategy == "smart_fit" and regen_only is not None and _wav_kind != "natural":
             regen_only = None
         # Manifest: stable segment id per current index. Per-segment WAVs are
         # named by stable id (dub_seg_path) so regen reuses the right audio after
@@ -266,7 +356,7 @@ async def dub_generate(job_id: str, req: DubRequest):
 
             seg_duration = seg.end - seg.start
             if seg_duration <= 0.05 or not seg.text.strip():
-                sr = _model.sampling_rate
+                sr = backend.sample_rate
                 # max(0, …): a zero/negative-duration slot must not feed a
                 # negative length to torch.zeros (raises) — _store_mix_wav
                 # turns the empty buffer into a harmless in-memory entry.
@@ -283,31 +373,38 @@ async def dub_generate(job_id: str, req: DubRequest):
             # Partial regen: if this segment isn't in the allow-list, reuse its
             # previously-rendered WAV so the final mix still covers the timeline.
             if regen_only is not None and seg_id not in regen_only:
-                seg_wav_path = dub_seg_path(job_id, seg_id)
-                if not os.path.exists(seg_wav_path):
-                    # Back-compat: jobs rendered before id-named files used seg_{index}.wav.
-                    _legacy = dub_seg_path(job_id, i)
-                    if os.path.exists(_legacy):
-                        seg_wav_path = _legacy
+                # This track's own cache first (seg_{lang}_{id}.wav). Legacy
+                # un-keyed files (seg_{id}.wav / seg_{index}.wav) are reused
+                # ONLY when no other-language track exists on the job — a
+                # multi-track job's un-keyed files hold whichever language
+                # rendered last, and splicing them here was exactly how
+                # "Regen N changed" mixed language B into track A (P1.3).
+                seg_wav_path = _seg_lang_path(seg_id)
+                if not os.path.exists(seg_wav_path) and _legacy_seg_cache_ok(job, lang_code):
+                    for _legacy_key in (seg_id, i):
+                        _legacy = dub_seg_path(job_id, _legacy_key)
+                        if os.path.exists(_legacy):
+                            seg_wav_path = _legacy
+                            break
                 if os.path.exists(seg_wav_path):
                     try:
                         _t_cache_0 = time.perf_counter()
                         cached_wav, cached_sr = torchaudio.load(seg_wav_path)
-                        if cached_sr != _model.sampling_rate:
+                        if cached_sr != backend.sample_rate:
                             import torchaudio.functional as AF
-                            cached_wav = AF.resample(cached_wav, cached_sr, _model.sampling_rate)
+                            cached_wav = AF.resample(cached_wav, cached_sr, backend.sample_rate)
                         # Pad/trim to slot — except smart_fit, whose mix
                         # loop needs the natural-rate length to compute the
                         # audio/video split (the seg_wav_kind guard above
                         # guarantees these cached WAVs are natural-rate).
                         if strategy != "smart_fit":
-                            target_samples = int(seg_duration * _model.sampling_rate)
+                            target_samples = int(seg_duration * backend.sample_rate)
                             current_samples = cached_wav.shape[-1]
                             if target_samples > current_samples:
                                 cached_wav = torch.nn.functional.pad(cached_wav, (0, target_samples - current_samples))
                             elif current_samples > target_samples:
                                 cached_wav = cached_wav[..., :target_samples]
-                        all_segment_wavs.append(_store_mix_wav(seg.start, seg.end, cached_wav, _model.sampling_rate, f"mix_{seg_id}"))
+                        all_segment_wavs.append(_store_mix_wav(seg.start, seg.end, cached_wav, backend.sample_rate, f"mix_{seg_id}"))
                         try:
                             del cached_wav
                         except Exception:
@@ -320,7 +417,7 @@ async def dub_generate(job_id: str, req: DubRequest):
                         # Fall through to a silent placeholder if the cached WAV
                         # is broken — cleaner than aborting the whole mix.
                         yield f"data: {json.dumps({'type': 'warning', 'segment': i, 'message': f'cached seg lost, padding silence: {str(e)[:120]}'})}\n\n"
-                sr = _model.sampling_rate
+                sr = backend.sample_rate
                 silence = torch.zeros(1, max(0, int(seg_duration * sr)))
                 all_segment_wavs.append(_store_mix_wav(seg.start, seg.end, silence, sr, f"mix_{seg_id}"))
                 try:
@@ -404,25 +501,23 @@ async def dub_generate(job_id: str, req: DubRequest):
                     torch.manual_seed(used_seed)
 
                 try:
-                    audios = _model.generate(
+                    audio_out = backend.generate(
                         text=text, language=lang if lang != "Auto" else None,
                         ref_audio=ref_audio, ref_text=ref_text,
                         instruct=instruct_str if instruct_str else None,
                         duration=dur_s, num_step=nstep, guidance_scale=cfg,
                         speed=spd, denoise=True, postprocess_output=True,
                     )
-                    audio_out = audios[0]
-                    sr = _model.sampling_rate if hasattr(_model, 'sampling_rate') else 24000
+                    sr = backend.sample_rate
 
                     # Apply per-segment DSP effect preset (default: broadcast)
                     seg_effect_preset = effect_preset or "broadcast"
                     if seg_effect_preset == "raw":
                         return audio_out
 
-                    # TODO(#312): this route runs the OmniVoice model directly (not the active
-                    # backend), so VoxCPM2 never reaches it. When these routes become
-                    # engine-aware, guard with `if not getattr(backend, "applies_own_mastering", False)`.
-                    mastered_audio = apply_mastering(audio_out, sample_rate=sr)
+                    mastered_audio = audio_out
+                    if not getattr(backend, "applies_own_mastering", False):
+                        mastered_audio = apply_mastering(audio_out, sample_rate=sr)
                     effect_chain = get_effect_chain(seg_effect_preset)
                     if effect_chain:
                         mastered_audio = apply_effects_chain(
@@ -453,24 +548,22 @@ async def dub_generate(job_id: str, req: DubRequest):
                         nstep, retry_steps,
                     )
                     try:
-                        audios = _model.generate(
+                        audio_out = backend.generate(
                             text=text, language=lang if lang != "Auto" else None,
                             ref_audio=ref_audio, ref_text=ref_text,
                             instruct=instruct_str if instruct_str else None,
                             duration=dur_s, num_step=retry_steps, guidance_scale=cfg,
                             speed=spd, denoise=True, postprocess_output=True,
                         )
-                        audio_out = audios[0]
-                        sr = _model.sampling_rate if hasattr(_model, 'sampling_rate') else 24000
+                        sr = backend.sample_rate
 
                         seg_effect_preset = effect_preset or "broadcast"
                         if seg_effect_preset == "raw":
                             return audio_out
 
-                        # TODO(#312): this route runs the OmniVoice model directly (not the active
-                        # backend), so VoxCPM2 never reaches it. When these routes become
-                        # engine-aware, guard with `if not getattr(backend, "applies_own_mastering", False)`.
-                        mastered_audio = apply_mastering(audio_out, sample_rate=sr)
+                        mastered_audio = audio_out
+                        if not getattr(backend, "applies_own_mastering", False):
+                            mastered_audio = apply_mastering(audio_out, sample_rate=sr)
                         effect_chain = get_effect_chain(seg_effect_preset)
                         if effect_chain:
                             mastered_audio = apply_effects_chain(
@@ -557,7 +650,7 @@ async def dub_generate(job_id: str, req: DubRequest):
                     yield f"data: {json.dumps({'type': 'cancelled', 'segments_processed': i + 1})}\n\n"
                     return
 
-                target_samples = int(seg_duration * _model.sampling_rate)
+                target_samples = int(seg_duration * backend.sample_rate)
                 current_samples = audio_tensor.shape[-1]
 
                 if strategy == "strict_slot":
@@ -575,7 +668,7 @@ async def dub_generate(job_id: str, req: DubRequest):
                 # trim, slip, stretch the video, or split audio/video
                 # retiming (smart_fit) to accommodate it.
 
-                generated_dur = audio_tensor.shape[-1] / _model.sampling_rate
+                generated_dur = audio_tensor.shape[-1] / backend.sample_rate
                 sync_ratio = round(generated_dur / max(seg_duration, 0.01), 3)
 
                 sync_scores.append(sync_ratio)
@@ -584,6 +677,9 @@ async def dub_generate(job_id: str, req: DubRequest):
                 # and job flush to the batch-write phase after the GPU loop.
                 _seg_fp = None
                 try:
+                    # track_lang scopes the hash to THIS track (P1.3); the
+                    # client-side recompute (/tools/incremental) sends the
+                    # same code, so parity (#281 class) holds per language.
                     _seg_fp = segment_fingerprint({
                         "text": seg.text,
                         "target_lang": getattr(seg, "target_lang", None),
@@ -592,24 +688,24 @@ async def dub_generate(job_id: str, req: DubRequest):
                         "speed": getattr(seg, "speed", None),
                         "direction": getattr(seg, "direction", None),
                         "effect_preset": getattr(seg, "effect_preset", None),
-                    })
+                    }, track_lang=lang_code)
                 except Exception as e:
                     logger.debug("seg fingerprint skipped for %s: %s", seg_id, e)
 
-                _pending_seg_writes.append((i, _model.sampling_rate, seg_id, _seg_fp, _num_step))
+                _pending_seg_writes.append((i, backend.sample_rate, seg_id, _seg_fp, _num_step))
 
                 # RVC needs the WAV on disk, so write it immediately only
                 # when RVC is active (uncommon path).
                 if rvc_is_enabled():
-                    seg_wav_path = dub_seg_path(job_id, seg_id)
-                    atomic_save_wav(seg_wav_path, audio_tensor, _model.sampling_rate)
+                    seg_wav_path = _seg_lang_path(seg_id)
+                    atomic_save_wav(seg_wav_path, audio_tensor, backend.sample_rate)
                     try:
                         await loop.run_in_executor(_gpu_pool, apply_rvc, seg_wav_path)
                         rvc_wav, rvc_sr = torchaudio.load(seg_wav_path)
-                        if rvc_sr == _model.sampling_rate:
+                        if rvc_sr == backend.sample_rate:
                             audio_tensor = rvc_wav
 
-                            target_samples = int(seg_duration * _model.sampling_rate)
+                            target_samples = int(seg_duration * backend.sample_rate)
                             current_samples = audio_tensor.shape[-1]
                             if target_samples > current_samples:
                                 audio_tensor = torch.nn.functional.pad(audio_tensor, (0, target_samples - current_samples))
@@ -619,31 +715,32 @@ async def dub_generate(job_id: str, req: DubRequest):
                         yield f"data: {json.dumps({'type': 'warning', 'segment': i, 'message': f'RVC skipped: {str(e)[:120]}'})}\n\n"
 
                 # Watermark this FRESH TTS output exactly once, right before it
-                # is persisted. The same seg_<id>.wav is BOTH the downloadable
-                # per-segment file AND the assembly input for the final track,
-                # so marking it here (and nowhere else) gives the downloadable
-                # WAV its mark back and the final mix inherits it — no double-
-                # mark. Cached-reuse audio is already marked; silence/zero slots
-                # carry no speech to mark, so neither is re-watermarked.
-                audio_tensor = embed_watermark(audio_tensor, _model.sampling_rate)
+                # is persisted. The same seg_{lang}_{id}.wav is BOTH the
+                # downloadable per-segment file AND the assembly input for the
+                # final track, so marking it here (and nowhere else) gives the
+                # downloadable WAV its mark back and the final mix inherits it —
+                # no double-mark. Cached-reuse audio is already marked;
+                # silence/zero slots carry no speech to mark, so neither is
+                # re-watermarked.
+                audio_tensor = embed_watermark(audio_tensor, backend.sample_rate)
 
-                seg_wav_path = dub_seg_path(job_id, seg_id)
+                seg_wav_path = _seg_lang_path(seg_id)
                 try:
                     # Keep the existing per-segment WAV contract for previews
                     # and partial regeneration, but do not keep the tensor in RAM.
-                    atomic_save_wav(seg_wav_path, audio_tensor, _model.sampling_rate)
+                    atomic_save_wav(seg_wav_path, audio_tensor, backend.sample_rate)
                 except Exception as e:
                     logger.warning("seg write failed for %s: %s", seg_id, e)
                     # If the durable segment write fails, still preserve a mix
                     # copy so this generation can finish.
-                    all_segment_wavs.append(_store_mix_wav(seg.start, seg.end, audio_tensor, _model.sampling_rate, f"mix_{seg_id}"))
+                    all_segment_wavs.append(_store_mix_wav(seg.start, seg.end, audio_tensor, backend.sample_rate, f"mix_{seg_id}"))
                     try:
                         del audio_tensor
                     except Exception:
                         pass
                     _release_audio_tensors()
                 else:
-                    all_segment_wavs.append((seg.start, seg.end, seg_wav_path, _model.sampling_rate))
+                    all_segment_wavs.append((seg.start, seg.end, seg_wav_path, backend.sample_rate))
                     try:
                         del audio_tensor
                     except Exception:
@@ -651,7 +748,7 @@ async def dub_generate(job_id: str, req: DubRequest):
                     _release_audio_tensors()
             except Exception as e:
                 yield f"data: {json.dumps({'type': 'error', 'segment': i, 'error': str(e)})}\n\n"
-                sr = _model.sampling_rate
+                sr = backend.sample_rate
                 all_segment_wavs.append(_store_mix_wav(seg.start, seg.end, torch.zeros(1, max(0, int(seg_duration * sr))), sr, f"mix_{seg_id}"))
                 sync_scores.append(1.0)
 
@@ -663,17 +760,24 @@ async def dub_generate(job_id: str, req: DubRequest):
         # Per-segment WAVs were written during the loop to keep RAM bounded.
         # Flush only lightweight fingerprints/quality metadata here.
         _t_diskw_0 = time.perf_counter()
-        hashes = job.setdefault("seg_hashes", {})
+        # P1.3 — fingerprints live per language so each track's staleness is
+        # judged against ITS OWN last generate. The flat job["seg_hashes"] is
+        # kept as a mirror of the CURRENT track's map: every existing consumer
+        # (the `done` event, dub-history restore, older frontends) already
+        # treats it as "the hashes of the language generated last", which is
+        # exactly what it now provably contains.
+        hashes = _seg_hashes_by_lang(job).setdefault(lang_code, {})
         quality_map = job.setdefault("seg_num_step", {})
         for (_si, _sr, _sid, _fp, _nstep) in _pending_seg_writes:
             if _fp is not None:
                 hashes[_sid] = _fp
             quality_map[_sid] = _nstep
+        job["seg_hashes"] = dict(hashes)
         # Single job flush instead of one per 8 segments.
         _save_job(job_id, job)
         _t_diskw = time.perf_counter() - _t_diskw_0
 
-        sr = _model.sampling_rate
+        sr = backend.sample_rate
         slot_fit = (req.slot_fit or "time_stretch").lower()
         overflow_budget_s = max(0.0, float(req.overflow_budget_s or 0.0))
 
@@ -759,7 +863,6 @@ async def dub_generate(job_id: str, req: DubRequest):
         # not from the plan — so subtitles land exactly on the audio.
         fitted_cues: list[dict] = []
 
-        lang_code = req.language_code or "und"
         track_path = os.path.join(DUB_DIR, job_id, f"dubbed_{lang_code}.wav")
         os.makedirs(os.path.dirname(track_path), exist_ok=True)
 
@@ -1049,8 +1152,12 @@ async def dub_generate(job_id: str, req: DubRequest):
             job["dubbed_tracks"][lang_code]["fit_fp"] = fit_fp
         # Record what kind of per-segment WAVs are on disk so a later
         # smart_fit run knows whether partial regen / fit-only re-mix can
-        # reuse them ("natural") or must regen once ("slotted").
-        job["seg_wav_kind"] = "slotted" if strategy == "strict_slot" else "natural"
+        # reuse them ("natural") or must regen once ("slotted"). Per-track
+        # (P1.3) — each language renders under its own strategy; the flat
+        # field stays in lock-step for older readers.
+        _kind = "slotted" if strategy == "strict_slot" else "natural"
+        job.setdefault("seg_wav_kind_by_lang", {})[lang_code] = _kind
+        job["seg_wav_kind"] = _kind
         _save_job(job_id, job)
 
         _t_total = time.perf_counter() - _t_start
@@ -1098,7 +1205,13 @@ async def preview_segment(job_id: str, req: SegmentPreviewRequest):
     if not job:
         raise HTTPException(status_code=404, detail="Job not found")
 
-    _model = await get_model()
+    # See the /dub/generate/{job_id} resolution above (issue #312 class) —
+    # a segment preview resolves ref_audio from the same auto-clone /
+    # voice-profile sources, so it needs the same cloning-capable gate.
+    try:
+        backend = await resolve_generation_backend(require_cloning=True)
+    except ValueError as e:
+        raise HTTPException(status_code=400, detail=str(e))
 
     def _gen():
         ref_audio = None
@@ -1133,7 +1246,7 @@ async def preview_segment(job_id: str, req: SegmentPreviewRequest):
                     instruct_str = row["instruct"]
 
         lang = req.language if req.language != "Auto" else None
-        audios = _model.generate(
+        audio_out = backend.generate(
             text=req.text,
             language=lang,
             ref_audio=ref_audio,
@@ -1146,21 +1259,15 @@ async def preview_segment(job_id: str, req: SegmentPreviewRequest):
             denoise=True,
             postprocess_output=True,
         )
-        audio_out = audios[0]
-        # TODO(#312): this route runs the OmniVoice model directly (not the active
-        # backend), so VoxCPM2 never reaches it. When these routes become
-        # engine-aware, guard with `if not getattr(backend, "applies_own_mastering", False)`.
-        mastered = apply_mastering(
-            audio_out,
-            sample_rate=getattr(_model, "sampling_rate", 24000),
-        )
-        return normalize_audio(mastered, target_dBFS=-2.0)
+        if not getattr(backend, "applies_own_mastering", False):
+            audio_out = apply_mastering(audio_out, sample_rate=backend.sample_rate)
+        return normalize_audio(audio_out, target_dBFS=-2.0)
 
     # Bounded + pool-reset on hang so a wedged preview generate can't starve the
     # GPU pool and brick the backend (#730 class).
     audio_tensor = await run_on_gpu_pool_guarded(_gen, what="Dub preview generate")
 
-    sr = getattr(_model, "sampling_rate", 24000)
+    sr = backend.sample_rate
     buf = io.BytesIO()
     _safe_torchaudio_save(buf, audio_tensor, sr, format="wav")
     buf.seek(0)

backend/api/routers/dub_translate.py

@@ -8,7 +8,7 @@ from fastapi.responses import JSONResponse
 
 from schemas.requests import TranslateRequest
 from services.model_manager import _cpu_pool, _gpu_pool
-from services.translator import cinematic_available, cinematic_refine_many
+from services.translator import cinematic_available, cinematic_refine_many, _cinematic_budget
 from api.routers.dub_core import _get_job
 
 router = APIRouter()
@@ -302,15 +302,69 @@ async def dub_translate(req: TranslateRequest):
             translated = await loop.run_in_executor(_gpu_pool, _translate_nllb)
             if os.environ.get("OMNIVOICE_UNLOAD_NLLB", "1") == "1":
                 _unload_nllb()
-            return {"translated": translated, "target_lang": req.target_lang, "source_lang": src_lang,
-                    **_dialect_flags(req, applied=False)}
+            # Cinematic/Autofit refine + rate-ratio badges must run for NLLB too
+            # (previously this returned before _maybe_cinematic, so a Cinematic
+            # pick on NLLB silently produced plain Fast output). Unloading NLLB
+            # first is fine — the refine LLM is a separate network provider.
+            return await _maybe_cinematic(translated, req, src_lang, loop)
 
-        # OpenAI / Ollama Local LLM Translation
+        # LLM translation — resolves through the LLM Skills registry: per-skill
+        # "Dub translation" override → global active provider (Settings → LLM
+        # Providers). The keys users configure + test in the app now actually
+        # power this engine; the raw TRANSLATE_* env vars stay working as a
+        # power-user override so pre-skills setups see zero behavior change.
         if provider == "openai":
-            base_url = os.environ.get("TRANSLATE_BASE_URL")
-            model_name = os.environ.get("TRANSLATE_MODEL", "gpt-3.5-turbo")
-            from openai import OpenAI
-            client = OpenAI(base_url=base_url, api_key=api_key or "local")
+            from services import llm_skills
+
+            llm_timeout = llm_skills._default_timeout()
+            handle = None
+            try:
+                handle = llm_skills.resolve_skill_client("dub_translation")
+            except Exception:  # noqa: BLE001 — resolution must never 500 a translate
+                logger.exception("dub_translation skill resolution failed; trying env fallback")
+            if handle is not None:
+                client = handle.client
+                model_name = handle.model
+                llm_timeout = handle.timeout
+                # The provider-store key never touches env; resolve it so the
+                # error scrubber below can redact it if a provider echoes it.
+                try:
+                    from services import llm_providers
+                    api_key = llm_providers.resolve_api_key(
+                        llm_skills.effective_provider("dub_translation")) or api_key
+                except Exception:  # noqa: BLE001 — scrub-key resolution is best-effort
+                    pass
+            elif os.environ.get("TRANSLATE_BASE_URL") or api_key:
+                # Legacy env-only setup (no provider configured in-app).
+                from openai import OpenAI
+                # max_retries=0: a 429 + long Retry-After must not let one segment's
+                # SDK call sleep+retry and blow the overall translate wall time.
+                client = OpenAI(base_url=os.environ.get("TRANSLATE_BASE_URL"),
+                                api_key=api_key or "local", max_retries=0)
+                model_name = os.environ.get("TRANSLATE_MODEL", "gpt-4o-mini")
+            else:
+                # Nothing configured anywhere — name the exact next step instead
+                # of letting an empty key surface as a raw 401 per segment.
+                try:
+                    reason = llm_skills.resolve_skill("dub_translation").reason
+                except Exception:  # noqa: BLE001
+                    reason = None
+                if reason == "disabled":
+                    friendly = (
+                        "The LLM translation engine is turned off — enable the "
+                        "'Dub translation' skill in Settings → LLM Skills, or "
+                        "pick another engine in the Engine dropdown."
+                    )
+                else:
+                    friendly = (
+                        "The LLM translation engine has no provider configured. "
+                        "Add and test one in Settings → LLM Providers (it powers "
+                        "this engine; route it per-skill in Settings → LLM "
+                        "Skills), or set TRANSLATE_BASE_URL + TRANSLATE_API_KEY "
+                        "+ TRANSLATE_MODEL. Or pick another engine in the "
+                        "Engine dropdown."
+                    )
+                return JSONResponse(status_code=400, content={"error": friendly})
 
             def _build_prompt(src_code: str, tgt_code: str) -> str:
                 """Build a system prompt that resists hallucinations on small
@@ -372,6 +426,7 @@ async def dub_translate(req: TranslateRequest):
                         res = client.chat.completions.create(
                             model=model_name,
                             temperature=0.2,  # less drift than default 1.0
+                            timeout=llm_timeout,  # bound per call (OMNIVOICE_LLM_TIMEOUT, 45s default)
                             messages=[
                                 {"role": "system", "content": sys_for_attempt},
                                 {"role": "user", "content": seg.text},
@@ -399,14 +454,22 @@ async def dub_translate(req: TranslateRequest):
                             seg.id, attempt + 1, e,
                         )
                 # Both attempts failed — keep source text + flag error so the
-                # frontend can surface "fallback to literal" warning.
-                return {"id": seg.id, "text": seg.text, "error": last_err or "llm-failed"}
+                # frontend can surface "fallback to literal" warning. Scrub the
+                # provider error: some OpenAI-compatible providers echo the key
+                # or a user_id in the body, which must not reach the UI verbatim.
+                from core.scrub import scrub_provider_error
+                return {"id": seg.id, "text": seg.text,
+                        "error": scrub_provider_error(last_err, api_key) or "llm-failed"}
 
             tasks = [loop.run_in_executor(_cpu_pool, _translate_llm, seg) for seg in req.segments]
             translated = await asyncio.gather(*tasks)
             translated.sort(key=lambda x: str(x["id"]))
-            return {"translated": translated, "target_lang": req.target_lang, "source_lang": src_lang,
-                    **_dialect_flags(req, applied=True)}
+            # provider="openai" is already an LLM translation — _maybe_cinematic
+            # skips the reflect/adapt re-refine (already_llm) but still stamps
+            # rate-ratio badges and runs the bounded Autofit fit pass. Before
+            # this it returned here, so Cinematic/Autofit on the LLM engine did
+            # nothing.
+            return await _maybe_cinematic(translated, req, src_lang, loop, already_llm=True)
 
         # Offline Argos Translate
         if provider == "argos" or provider == "libretranslate":
@@ -465,8 +528,11 @@ async def dub_translate(req: TranslateRequest):
                 return results
 
             translated = await loop.run_in_executor(_cpu_pool, _translate_argos)
-            return {"translated": translated, "target_lang": req.target_lang, "source_lang": src_lang,
-                    **_dialect_flags(req, applied=False)}
+            # Argos is the DEFAULT engine — routing it through _maybe_cinematic is
+            # the headline fix: a user who picks Cinematic/Autofit on Argos now
+            # gets the LLM refine + fit pass (and rate-ratio badges in Fast mode)
+            # instead of silent plain-Fast output.
+            return await _maybe_cinematic(translated, req, src_lang, loop)
 
         # Legacy / API Deep_Translator logic.
         # Preflight the optional `deep_translator` dep once so we fail with a
@@ -540,7 +606,11 @@ async def dub_translate(req: TranslateRequest):
                     )
                     time.sleep(0.25 * (attempt + 1))
             logger.error("translate %s -> %s gave up (provider=%s): %s", src_arg, seg_lc, provider, last_err)
-            return {"id": seg.id, "text": seg.text, "error": last_err or "unknown"}
+            # Scrub before it reaches the UI — DeepL/Microsoft errors can echo
+            # the API key (same class as the OpenAI user_id leak).
+            from core.scrub import scrub_provider_error
+            return {"id": seg.id, "text": seg.text,
+                    "error": scrub_provider_error(last_err, _deepl_key or _msft_key or api_key) or "unknown"}
 
         tasks = [loop.run_in_executor(_cpu_pool, _translate_single, seg) for seg in req.segments]
         translated = await asyncio.gather(*tasks)
@@ -554,24 +624,19 @@ async def dub_translate(req: TranslateRequest):
         return JSONResponse(status_code=500, content={"error": str(e)})
 
 
-async def _maybe_cinematic(translated, req, src_lang, loop):
-    """If quality=cinematic and a usable LLM is configured, run REFLECT+ADAPT.
-    Otherwise return Fast-mode shape unchanged.
+def _stamp_predicted_rate_ratio(translated, req) -> None:
+    """Stamp a predicted ``rate_ratio`` on every row that has a known slot.
+
+    No LLM needed — just the per-language CPS table from ``services/speech_rate``.
+    The UI's ``seg-rate-badge`` reads it (Fast mode included) to show which
+    segments will compress hard at generation time, so users can edit text or
+    pick a heavier quality. Mutates ``translated`` in place; never raises.
     """
-    quality = (getattr(req, "quality", None) or "fast").lower()
-    # Stamp the predicted rate_ratio on every translated row that has a
-    # known slot. Works for Fast mode too — no LLM needed; just the CPS
-    # table from services/speech_rate. The UI's `seg-rate-badge` reads
-    # this value and shows users which segments will compress hard at
-    # generation time, so they can edit text or pick Cinematic quality.
     try:
         from services.speech_rate import rate_ratio as _predict_rate_ratio
+        slots = {str(s.id): getattr(s, "slot_seconds", None) for s in req.segments}
         for row in translated:
-            seg_ref = next(
-                (s for s in req.segments if str(s.id) == str(row["id"])),
-                None,
-            )
-            slot = getattr(seg_ref, "slot_seconds", None) if seg_ref else None
+            slot = slots.get(str(row["id"]))
             text = (row.get("text") or "").strip()
             if slot and text and not row.get("error"):
                 row["rate_ratio"] = round(
@@ -580,22 +645,119 @@ async def _maybe_cinematic(translated, req, src_lang, loop):
     except Exception as e:
         logger.debug("non-LLM rate_ratio prediction skipped: %s", e)
 
-    base = {"translated": translated, "target_lang": req.target_lang, "source_lang": src_lang,
-            "quality_used": "fast", **_dialect_flags(req, applied=False)}
 
-    # Autofit is Cinematic + a strict "never exceed the slot" fit pass, so both
-    # qualities take the LLM refine path below. Fast (and anything else) returns
-    # the plain translation unchanged.
+async def _apply_fit_pass(rows, req, slots_by_id, source_by_id, quality, loop, deadline) -> None:
+    """Run the Autofit slot-fit pass over ``rows`` concurrently, in place.
+
+    Bounded by ``deadline`` (shared with the cinematic refine) so a slow /
+    rate-limited LLM can't spin the fit pass per-segment unbounded — the old
+    behavior, which ran one blocking ``adjust_for_slot`` per segment in the
+    merge loop, outside any budget. Segments still running at the deadline keep
+    their current text and get ``rate_error='fit-budget'``. Only rows with a
+    slot + text + no prior error participate.
+    """
+    strict = (quality == "autofit")
+    items = []
+    for row in rows:
+        seg_id = str(row["id"])
+        slot = slots_by_id.get(seg_id)
+        text = row.get("text") or ""
+        if slot and text and not row.get("error"):
+            items.append((seg_id, text, float(slot), req.target_lang,
+                          source_by_id.get(seg_id), strict))
+    if not items:
+        return
+    try:
+        from services.speech_rate import adjust_for_slot_many
+        fits = await adjust_for_slot_many(
+            items, executor=_cpu_pool, deadline=deadline, loop=loop,
+        )
+    except Exception as e:
+        logger.warning("rate-fit pass skipped: %s", e)
+        return
+    for row in rows:
+        f = fits.get(str(row["id"]))
+        if not f:
+            continue
+        if f.get("text"):
+            row["text"] = f["text"]
+        if f.get("rate_ratio") is not None:
+            row["rate_ratio"] = f["rate_ratio"]
+        if f.get("error"):
+            row["rate_error"] = f["error"]
+
+
+async def _maybe_cinematic(translated, req, src_lang, loop, *, already_llm=False):
+    """Post-process a literal translation into Cinematic/Autofit output.
+
+    Runs for EVERY provider now (Argos/NLLB/Google/…/OpenAI). The three
+    LLM-independent branches (nllb/argos) and the openai branch used to return
+    *before* reaching this, so a Cinematic/Autofit pick on them — including the
+    DEFAULT Argos engine — silently produced plain Fast output with a success
+    toast. Fast mode still returns the plain translation (plus rate-ratio badges).
+
+    ``already_llm`` (provider="openai"): the translation was itself produced by
+    an LLM, so the REFLECT+ADAPT *re*-refine is skipped, but the bounded Autofit
+    fit pass + rate-ratio stamping still run, and the dialect the translate
+    prompt already baked in is reported as applied.
+    """
+    quality = (getattr(req, "quality", None) or "fast").lower()
+
+    _stamp_predicted_rate_ratio(translated, req)
+
+    # #280 item 2 — regional dialect hint, guarded against a stale dialect from
+    # another language. For already_llm the initial translate prompt already
+    # applied it, so it's reported applied in the Fast-shape base too.
+    dialect_hint = ""
+    _dialect = getattr(req, "dialect", None)
+    if _dialect and str(_dialect).lower().startswith(str(req.target_lang).lower()[:2]):
+        dialect_hint = dialect_clause(_dialect)
+
+    base = {"translated": translated, "target_lang": req.target_lang, "source_lang": src_lang,
+            "quality_used": "fast",
+            **_dialect_flags(req, applied=(already_llm and bool(dialect_hint)))}
+
+    # Fast (and anything unrecognised) returns the plain translation unchanged.
     if quality not in ("cinematic", "autofit"):
         return base
 
+    source_by_id: dict[str, str] = {str(s.id): s.text for s in req.segments}
+    slots_by_id = {
+        str(s.id): getattr(s, "slot_seconds", None)
+        for s in req.segments
+        if getattr(s, "slot_seconds", None)
+    }
+
+    # One wall-clock deadline shared by the whole LLM phase (refine + fit), so a
+    # slow/rate-limited provider can't run either pass unbounded. <=0 disables.
+    budget = _cinematic_budget()
+    deadline = (loop.time() + budget) if budget and budget > 0 else None
+
+    # provider="openai": already an LLM translation → skip REFLECT+ADAPT, keep
+    # the rate-ratio badges, still run the bounded fit pass.
+    if already_llm:
+        merged = []
+        for row in translated:
+            out = {"id": row["id"],
+                   "text": row.get("text", "") or "",
+                   "literal": row.get("text", "") or ""}
+            if row.get("error"):
+                out["error"] = row["error"]
+            if "rate_ratio" in row:
+                out["rate_ratio"] = row["rate_ratio"]
+            merged.append(out)
+        await _apply_fit_pass(merged, req, slots_by_id, source_by_id, quality, loop, deadline)
+        return {"translated": merged, "target_lang": req.target_lang,
+                "source_lang": src_lang, "quality_used": quality,
+                **_dialect_flags(req, applied=bool(dialect_hint))}
+
+    # Non-LLM provider → the reflect/adapt refine needs a separately-configured
+    # LLM (Settings → LLM Providers). Without one, degrade to Fast with a flag.
     if not cinematic_available():
         logger.warning("%s requested but no LLM configured — returning Fast result.", quality)
         base["cinematic_skipped"] = "no-llm-configured"
         return base
 
-    # Build a map from id → original segment (to fetch source text + direction).
-    source_by_id: dict[str, str] = {str(s.id): s.text for s in req.segments}
     directions: dict[str, str] = {
         str(s.id): s.direction
         for s in req.segments
@@ -603,7 +765,7 @@ async def _maybe_cinematic(translated, req, src_lang, loop):
     }
     pairs = []
     passthrough_index = {}
-    for i, row in enumerate(translated):
+    for row in translated:
         seg_id = str(row["id"])
         literal = row.get("text", "") or ""
         if row.get("error") or not literal.strip():
@@ -614,12 +776,6 @@ async def _maybe_cinematic(translated, req, src_lang, loop):
     if not pairs:
         return base
 
-    # #280 item 2: thread the regional-dialect hint into the reflect/adapt
-    # prompts. Guard against a stale dialect from another language.
-    dialect_hint = ""
-    if req.dialect and str(req.dialect).lower().startswith(str(req.target_lang).lower()[:2]):
-        dialect_hint = dialect_clause(req.dialect)
-
     refined = await cinematic_refine_many(
         pairs,
         source_lang=src_lang,
@@ -631,16 +787,6 @@ async def _maybe_cinematic(translated, req, src_lang, loop):
     )
     refined_by_id = {r["id"]: r for r in refined}
 
-    # Phase 4.4 — speech-rate fit pass. Segment boundaries aren't in the
-    # translate request (by design — translator is boundary-agnostic), so we
-    # only run it when the caller supplied `slot_seconds` on each segment.
-    # The frontend populates this for Cinematic calls from the edit view.
-    slots_by_id = {
-        str(s.id): getattr(s, "slot_seconds", None)
-        for s in req.segments
-        if getattr(s, "slot_seconds", None)
-    }
-
     merged = []
     for row in translated:
         seg_id = str(row["id"])
@@ -659,32 +805,11 @@ async def _maybe_cinematic(translated, req, src_lang, loop):
         }
         if r.get("error"):
             out["error"] = r["error"]
-
-        # Optional slot-fit pass — only when the caller asked for cinematic
-        # *and* provided a slot. Runs best-effort; no-LLM or mid-loop failure
-        # just leaves the cinematic text untouched.
-        slot = slots_by_id.get(seg_id)
-        if slot and out["text"]:
-            try:
-                from services.speech_rate import adjust_for_slot
-                fit = await asyncio.to_thread(
-                    adjust_for_slot,
-                    out["text"],
-                    slot_seconds=float(slot),
-                    target_lang=req.target_lang,
-                    source_text=source_by_id.get(seg_id),
-                    strict=(quality == "autofit"),
-                )
-                if fit.get("text"):
-                    out["text"] = fit["text"]
-                out["rate_ratio"] = fit.get("rate_ratio")
-                if fit.get("error"):
-                    out["rate_error"] = fit["error"]
-            except Exception as e:
-                logger.warning("rate-fit skipped for %s: %s", seg_id, e)
-
         merged.append(out)
 
+    # Phase 4.4 speech-rate fit pass — now concurrent + bounded (see helper).
+    await _apply_fit_pass(merged, req, slots_by_id, source_by_id, quality, loop, deadline)
+
     return {
         "translated": merged,
         "target_lang": req.target_lang,

backend/api/routers/engines.py

@@ -15,6 +15,9 @@ Environment variables (`OMNIVOICE_TTS_BACKEND`, `OMNIVOICE_ASR_BACKEND`,
 `OMNIVOICE_LLM_BACKEND`) still win over the UI choice so power-users can pin
 a backend without Settings silently undoing it.
 """
+import os
+import re
+import threading
 from time import perf_counter
 
 from fastapi import APIRouter, Depends, HTTPException
@@ -261,9 +264,177 @@ def engine_health(engine_id: str):
     }
 
 
+# ── Real-synthesis self-test (in-process TTS engines) ──────────────────────
+#
+# ``/health`` above is a liveness/import probe — for an in-process backend it
+# only calls ``is_available()`` and the UI labels the result "deps OK". This
+# route goes one step further: for an AVAILABLE, IN-PROCESS TTS engine it runs
+# a *tiny real synthesis* from a fixed short phrase and reports duration +
+# sample-rate + sample count, proving the engine actually emits audio rather
+# than merely importing. The Compat Matrix's "Self-test" button calls it.
+#
+# Guardrails (kept identical across macOS/Windows/Linux per the default-feature
+# rule — the phrase, timeout and gating don't branch on OS):
+#   * TTS family + available + in-process only. Subprocess engines keep their
+#     spawn-and-ping ``health_check`` (a real synth there is a sidecar
+#     cold-start — out of scope for a click-to-test affordance).
+#   * Bounded wall-clock timeout (``OMNIVOICE_SELFTEST_TIMEOUT_S``, default 90s):
+#     a runaway synth returns ``ok=False`` / ``timed_out=True`` instead of
+#     hanging the Settings panel. The orphaned worker is best-effort daemon.
+#   * A process-wide lock serialises self-tests so a click-storm can't stack
+#     concurrent model loads.
+#   * Only ever on user click (POST) — never on Settings load. Loopback-gated.
+
+# Deliberately short + ASCII so the synth stays CPU-cheap and the phrase never
+# trips the no-hardcoded-CJK guard.
+_SELFTEST_PHRASE = "OmniVoice engine self test."
+_SELFTEST_LOCK = threading.Lock()
+
+
+def _selftest_timeout_s() -> float:
+    try:
+        return max(1.0, float(os.environ.get("OMNIVOICE_SELFTEST_TIMEOUT_S", "90")))
+    except (TypeError, ValueError):
+        return 90.0
+
+
+def _sample_count(audio) -> int:
+    """Total sample count of an engine's ``generate()`` return, tolerant of
+    torch.Tensor / numpy.ndarray / list shapes. 0 when it can't be measured."""
+    try:
+        shape = getattr(audio, "shape", None)
+        if shape is not None and len(shape) > 0:
+            return int(shape[-1])
+        return int(len(audio))
+    except Exception:
+        return 0
+
+
+def _run_synth_bounded(backend, timeout_s: float) -> dict | None:
+    """Run one tiny synthesis in a daemon thread, bounded by ``timeout_s``.
+
+    Returns ``{"audio": .., "duration_ms": ..}`` on success, ``{"error": exc}``
+    on a synth exception, or ``None`` when the timeout elapsed (worker left
+    running best-effort — Python threads can't be force-killed)."""
+    box: dict = {}
+
+    def _worker():
+        t0 = perf_counter()
+        try:
+            audio = backend.generate(_SELFTEST_PHRASE, language="en", num_step=8)
+            box["audio"] = audio
+        except Exception as exc:  # noqa: BLE001 — surfaced to the caller as ok=False
+            box["error"] = exc
+        finally:
+            box["duration_ms"] = (perf_counter() - t0) * 1000.0
+
+    th = threading.Thread(target=_worker, name="engine-selftest", daemon=True)
+    th.start()
+    th.join(timeout_s)
+    if th.is_alive():
+        return None
+    return box
+
+
+class SelfTestResponse(BaseModel):
+    id: str
+    ok: bool
+    message: str
+    duration_ms: float
+    sample_rate: int | None = None
+    num_samples: int | None = None
+    audio_seconds: float | None = None
+    timed_out: bool = False
+
+
+@router.post(
+    "/engines/{engine_id}/selftest",
+    response_model=SelfTestResponse,
+    dependencies=[Depends(require_loopback)],
+)
+def engine_selftest(engine_id: str):
+    """Run a bounded, real synthesis on an available in-process TTS engine.
+
+    404 for an unknown TTS id; 400 when the engine is subprocess-isolated or
+    not currently available (a real synth on either is meaningless). Never
+    raises through to a 500 on a synth failure — the exception is captured into
+    ``ok=False`` / ``message`` so the panel renders a per-row failure."""
+    if engine_id not in tts_backend._REGISTRY:
+        raise HTTPException(
+            status_code=404,
+            detail=f"unknown TTS engine id: {engine_id!r}",
+        )
+    cls = tts_backend._REGISTRY[engine_id]
+    if getattr(cls, "_is_subprocess_isolated", False):
+        raise HTTPException(
+            status_code=400,
+            detail=(
+                f"{engine_id} is subprocess-isolated — self-test runs real "
+                "synthesis for in-process engines only. Use Test engine "
+                "(spawn-and-ping) for subprocess engines."
+            ),
+        )
+    try:
+        ok, msg = cls.is_available()
+    except Exception as exc:  # noqa: BLE001
+        ok, msg = False, f"{type(exc).__name__}: {exc}"
+    if not ok:
+        raise HTTPException(
+            status_code=400,
+            detail=(
+                f"{engine_id} is not available: {tts_backend._mask_hf_tokens(msg)}. "
+                "Install/enable the engine, then self-test."
+            ),
+        )
+
+    timeout_s = _selftest_timeout_s()
+    # Serialise so a click-storm can't stack concurrent model loads.
+    with _SELFTEST_LOCK:
+        backend = _get_engine_instance(cls)
+        res = _run_synth_bounded(backend, timeout_s)
+
+    if res is None:
+        return SelfTestResponse(
+            id=engine_id,
+            ok=False,
+            message=f"timed out after {timeout_s:.0f}s (model still loading?)",
+            duration_ms=timeout_s * 1000.0,
+            timed_out=True,
+        )
+    if "error" in res:
+        exc = res["error"]
+        return SelfTestResponse(
+            id=engine_id,
+            ok=False,
+            message=tts_backend._mask_hf_tokens(f"{type(exc).__name__}: {exc}"),
+            duration_ms=res.get("duration_ms", 0.0),
+        )
+
+    n = _sample_count(res.get("audio"))
+    try:
+        sr = int(getattr(backend, "sample_rate", 0) or 0) or None
+    except Exception:
+        sr = None
+    secs = round(n / sr, 3) if (sr and n) else None
+    return SelfTestResponse(
+        id=engine_id,
+        ok=n > 0,
+        message="synthesized" if n > 0 else "engine returned no audio",
+        duration_ms=res["duration_ms"],
+        sample_rate=sr,
+        num_samples=n or None,
+        audio_seconds=secs,
+    )
+
+
 class SelectEngineRequest(BaseModel):
     family: str   # "tts" | "asr" | "llm"
     backend_id: str
+    # Only meaningful for family="tts", backend_id="mlx-audio" (#981) — picks
+    # which of mlx-audio's curated models is actually loaded. A curated key
+    # ("kokoro") or a raw HF repo id ("mlx-community/Kokoro-82M-bf16") — the
+    # same tolerance MLXAudioBackend.__init__ already has. Ignored otherwise.
+    model_id: str | None = None
 
 
 class SelectEngineResponse(BaseModel):
@@ -306,6 +477,24 @@ def select_engine(req: SelectEngineRequest):
             f"Backend {req.backend_id} can't run on this machine: {why}. "
             f"Pick an engine with a CPU path, or one that supports this host's GPU.",
         )
+    # #981: mlx-audio multiplexes 7+ curated models behind one backend id —
+    # persist the model pick alongside the backend id so the UI can actually
+    # select which curated model gets loaded (previously it always defaulted
+    # to Kokoro no matter what the user downloaded in Settings → Models).
+    if req.family == "tts" and req.backend_id == "mlx-audio" and req.model_id is not None:
+        known_keys = tts_backend.MLXAudioBackend.CURATED_MODELS
+        # Accept a curated key OR a raw HF repo id ("owner/name") — the same
+        # tolerance MLXAudioBackend.__init__ already has for power users.
+        # Anything else (typo'd key, malformed id) is rejected outright
+        # rather than silently persisted as a "custom repo" that then fails
+        # to resolve at load time.
+        if req.model_id not in known_keys and not re.fullmatch(r"[\w.-]+/[\w.-]+", req.model_id):
+            raise HTTPException(
+                400,
+                f"Unknown mlx-audio model: {req.model_id!r}. Expected one of "
+                f"{sorted(known_keys)} or a HF repo id like 'owner/name'.",
+            )
+        prefs.set_("mlx_audio_model_id", req.model_id)
     prefs.set_(pref_key, req.backend_id)
     return {
         "family": req.family,

backend/api/routers/generation.py

@@ -1,5 +1,6 @@
 import os
 import io
+import re
 import uuid
 import time
 import random
@@ -104,8 +105,8 @@ def _apply_effect_chain(audio_out, sample_rate, effect_preset, *, skip_mastering
 
     ``skip_mastering`` honors a backend's ``applies_own_mastering`` flag
     (issue #312): studio engines (e.g. VoxCPM2's native 48 kHz output)
-    opt out of the broadcast Compressor + Reverb chain that's tuned for
-    OmniVoice's 24 kHz clone output. Loudness normalization still runs —
+    opt out of the broadcast highpass + Compressor pre-stage that's tuned
+    for OmniVoice's 24 kHz clone output. Loudness normalization still runs —
     it's a benign peak scale. Mirrors ``_run_tts`` in openai_compat.py.
     """
     from services.audio_dsp import (
@@ -142,6 +143,158 @@ def _apply_effect_chain(audio_out, sample_rate, effect_preset, *, skip_mastering
     return normalize_audio(audio_out, target_dBFS=-2.0)
 
 
+def _safe_exc_text(e: BaseException) -> str:
+    """``f"{type(e).__name__}: {e}"`` — the house style used for
+    unrecognized-error formatting throughout the backend (grep
+    ``type(e).__name__`` in settings.py / asr_backend.py / model_manager.py
+    / engines.py) — with a guard against leaking a raw container repr.
+
+    #977: an AssertionError raised deep inside a vendored dependency
+    (mlx-audio's Kokoro pipeline) had ``.args`` shaped like
+    ``('du', {'a': 'American English', ...})`` — a tuple containing a dict.
+    ``str(e)`` on that renders the WHOLE table straight into the user-facing
+    message. Any engine's ``generate()`` can raise something shaped like
+    this (not just Kokoro), so guard generically: if any element of
+    ``e.args`` is a container rather than a plain string, don't interpolate
+    ``str(e)`` at all — name the exception type and point at the log
+    instead.
+    """
+    args = getattr(e, "args", ())
+    if any(isinstance(a, (dict, list, tuple, set, frozenset)) for a in args):
+        return f"{type(e).__name__} — see Settings → Logs → Backend for details"
+    return f"{type(e).__name__}: {e}"
+
+
+def _exception_chain(e):
+    """Yield ``e`` plus every ``__cause__``/``__context__`` beneath it
+    (cycle-safe). Engines and hub libraries routinely wrap the original
+    transport/allocator error, so classification must look at the whole
+    chain, not just the outermost message."""
+    seen = set()
+    stack = [e]
+    while stack:
+        exc = stack.pop()
+        if exc is None or id(exc) in seen:
+            continue
+        seen.add(id(exc))
+        yield exc
+        stack.append(exc.__cause__)
+        stack.append(exc.__context__)
+
+
+# #880: transport-level exception type names from httpx (huggingface_hub ≥1.x
+# downloads over it) and requests/urllib3 (older engine deps). Any of these
+# anywhere in the exception chain means the network — not memory — killed the
+# generation.
+_NETWORK_EXC_NAMES = frozenset({
+    # httpx
+    "ConnectError", "ConnectTimeout", "ReadTimeout", "ReadError",
+    "WriteError", "WriteTimeout", "PoolTimeout", "NetworkError",
+    "TransportError", "RemoteProtocolError", "ProxyError", "CloseError",
+    # requests / urllib3
+    "ConnectionError", "ChunkedEncodingError", "MaxRetryError",
+    "NewConnectionError", "ProtocolError",
+    # stdlib socket-level drops mid-download
+    "ConnectionResetError", "ConnectionAbortedError", "ConnectionRefusedError",
+    # huggingface_hub: failed first-use download with nothing in the disk cache
+    "LocalEntryNotFoundError",
+})
+
+# Same class, but the transport error was stringified into a wrapper message
+# (so the type name is gone). All lowercase; matched against .lower().
+_NETWORK_MSG_SIGNATURES = (
+    "client has been closed",    # httpx closed-client lifecycle error (#880)
+    "cannot send a request",     # httpx: same error, message head
+    "connection error",          # requests / huggingface_hub wording
+    "connection reset",          # ECONNRESET mid-download
+    "read timed out",            # requests/urllib3 timeout wording
+    "max retries exceeded",      # urllib3 retry exhaustion
+    "temporary failure in name resolution",  # DNS down (glibc)
+    "name or service not known",             # DNS down (glibc)
+    "getaddrinfo failed",                    # DNS down (Windows)
+)
+
+
+def _is_network_failure(e) -> bool:
+    """True iff the failure (anywhere in its chain) is an HTTP-client
+    lifecycle / network-transport error — e.g. a first-use model download
+    from the HF Hub dying mid-generation (#880)."""
+    for exc in _exception_chain(e):
+        if type(exc).__name__ in _NETWORK_EXC_NAMES:
+            return True
+        low = str(exc).lower()
+        if any(sig in low for sig in _NETWORK_MSG_SIGNATURES):
+            return True
+    return False
+
+
+# Signatures of an *actual* out-of-memory condition. All lowercase.
+_OOM_MSG_SIGNATURES = (
+    "out of memory",               # CUDA / MPS / generic torch wording
+    "not enough memory",           # torch CPU DefaultCPUAllocator
+    "cannot allocate memory",      # OS-level ENOMEM
+    "std::bad_alloc",              # C++ allocator failure
+    "cublas_status_alloc_failed",  # cuBLAS workspace allocation
+    "cuda_error_out_of_memory",    # raw CUDA driver error name
+    "paging file is too small",    # Windows [WinError 1455] mapping DLLs
+)
+
+
+def _is_oom_failure(e) -> bool:
+    """True iff the failure (anywhere in its chain) actually looks like an
+    out-of-memory condition — the only case where the Flush hint is honest."""
+    for exc in _exception_chain(e):
+        if isinstance(exc, MemoryError):
+            return True
+        # torch.cuda.OutOfMemoryError subclasses RuntimeError; match by name
+        # so this needs no torch import (and covers other frameworks' twins).
+        if type(exc).__name__ == "OutOfMemoryError":
+            return True
+        low = str(exc).lower()
+        if any(sig in low for sig in _OOM_MSG_SIGNATURES):
+            return True
+    return False
+
+
+# #919: an engine that requires a model path / env var which isn't set (or is
+# set to a directory missing its model files) fails with a *configuration*
+# error, not a runtime one. The reporting user selected sherpa-onnx and hit
+# "OMNIVOICE_SHERPA_MODEL not set. Point it to a sherpa-onnx TTS model
+# directory …" — a pure setup problem — yet the OOM catch-all told them (on a
+# 63 GB-RAM box) to press Flush for memory they never ran out of. Classify the
+# whole CLASS of "engine not configured / required env var not set" errors so
+# any current or future opt-in engine (sherpa/Confucius4/dots/MOSS …) surfaces
+# actionable setup guidance instead of the memory hint. All lowercase; matched
+# over the whole exception chain (engines wrap the original error).
+_CONFIG_MSG_SIGNATURES = (
+    "not set. point it to",      # sherpa: OMNIVOICE_SHERPA_MODEL not set
+    "no model.onnx found in",    # sherpa: dir set but the model file is missing
+    "not configured",            # generic "engine not configured" wording
+    "venv not found. set",       # confucius4/dots/MOSS dedicated-venv opt-ins
+    "unavailable: omnivoice_",   # is_available() reason wrapped by _ensure_loaded
+)
+
+# An OMNIVOICE_* engine env var named alongside "not set" / "point it to" /
+# "set omnivoice_…" is the strongest config-missing signal and generalizes to
+# any engine gated on such a var (issue #919 class).
+_CONFIG_ENV_RE = re.compile(r"omnivoice_[a-z0-9_]+")
+
+
+def _is_config_failure(e) -> bool:
+    """True iff the failure is a *configuration* problem — a required engine
+    model path / env var that isn't set (or points nowhere) — rather than a
+    runtime fault. The remedy is to set the value, never to Flush VRAM."""
+    for exc in _exception_chain(e):
+        low = str(exc).lower()
+        if any(sig in low for sig in _CONFIG_MSG_SIGNATURES):
+            return True
+        if _CONFIG_ENV_RE.search(low) and (
+            "not set" in low or "point it to" in low or "set omnivoice_" in low
+        ):
+            return True
+    return False
+
+
 def _oom_friendly_reraise(e):
     """Best-effort cache flush + the user-facing OOM hint shared by both
     inference paths."""
@@ -233,10 +386,56 @@ def _oom_friendly_reraise(e):
             f"Restart the app and try again; the Flush button won't help here. "
             f"Underlying error: {e}"
         ) from e
+    # #880: an httpx/requests transport failure surfacing from generation —
+    # most commonly a first-use model download from the HF Hub dying with
+    # httpx's "Cannot send a request, as the client has been closed" (the
+    # shared client got closed mid-lifecycle), a connect/read timeout, or a
+    # dropped connection — is NOT out of memory. The model never finished
+    # loading, so Flush is the wrong remedy; retrying is. Matched over the
+    # whole exception chain (type names + stringified signatures) because
+    # engines wrap the original transport error.
+    if _is_network_failure(e):
+        raise RuntimeError(
+            f"A model download or network call failed mid-generation (usually "
+            f"the engine fetching its model files on first use). This is a "
+            f"network problem, not a memory problem — flushing VRAM won't "
+            f"help. Retry the generation; if it keeps failing, check your "
+            f"internet connection and any HF_ENDPOINT/mirror setting. "
+            f"Underlying error: {e}"
+        ) from e
+    # #919: a required engine model path / env var that isn't set is a pure
+    # CONFIGURATION problem, not a runtime one. sherpa-onnx's
+    # "OMNIVOICE_SHERPA_MODEL not set. Point it to …" used to fall through to
+    # the OOM catch-all, telling a user with 63 GB of RAM to press Flush. Point
+    # at the real fix — set the variable — and never mention memory or Flush.
+    # The underlying error already names the exact variable + what to point it
+    # at (and Settings → Engines shows a copy-paste setup line), so keep it
+    # front-and-center. Checked before the OOM branch so a config error can
+    # never be mislabeled as memory.
+    if _is_config_failure(e):
+        raise RuntimeError(
+            f"This TTS engine isn't set up yet — it needs a model path or "
+            f"environment variable that isn't configured, so nothing was "
+            f"generated. Set it as the underlying error describes (it names the "
+            f"exact variable and what to point it at), then restart OmniVoice — "
+            f"or pick a ready engine in Settings → Engines. This is a setup "
+            f"problem, not a memory one. Underlying error: {e}"
+        ) from e
+    # #880 (the class bug): the OOM hint used to be the catch-all fallback,
+    # so ANY unrecognized error told the user to press Flush for memory they
+    # never ran out of. Only claim OOM when something in the chain actually
+    # looks like one; everything else surfaces as what it is — unrecognized —
+    # with the real error front and center.
+    if _is_oom_failure(e):
+        raise RuntimeError(
+            f"TTS engine stopped mid-generation. This usually means it ran out of memory. "
+            f"Try the Flush button to reload the model, then regenerate. Underlying error: {e}"
+        ) from e
     raise RuntimeError(
-        f"TTS engine stopped mid-generation. This usually means it ran out of memory. "
-        f"Try the Flush button to reload the model, then regenerate. Underlying error: {e}"
-    )
+        f"TTS engine stopped mid-generation with an error OmniVoice doesn't "
+        f"recognize. Retry once; if it keeps failing, please report it with "
+        f"the full trace. Underlying error: {_safe_exc_text(e)}"
+    ) from e
 
 
 def _run_inference(
@@ -757,7 +956,7 @@ async def generate_speech(
             status_code=500,
             detail=(
                 f"Couldn't synthesize audio. See Settings → Logs → Backend for the full trace. "
-                f"Underlying error: {e}"
+                f"Underlying error: {_safe_exc_text(e)}"
             ),
         )
     finally:

backend/api/routers/glossary.py

@@ -189,15 +189,21 @@ def auto_extract(project_id: str, req: AutoExtractRequest):
     Writes them as `auto=1` rows. Existing terms with the same (source,target)
     are NOT duplicated. Returns the full current glossary after the pass.
     """
-    from services.translator import _llm_client, _llm_model, _llm_timeout  # reuse same client
+    # Resolved through the LLM Skills registry so auto-extract can be toggled
+    # or routed to its own provider (Settings → LLM Skills) independently of
+    # the translation pipeline. None == disabled or no provider configured.
+    from services import llm_skills
 
-    client = _llm_client()
-    if client is None:
+    handle = llm_skills.resolve_skill_client("glossary_extract")
+    if handle is None:
         raise HTTPException(
             status_code=503,
             detail=(
-                "Auto-extract needs an LLM. Set TRANSLATE_BASE_URL + TRANSLATE_API_KEY "
-                "(Ollama works locally: base_url=http://localhost:11434/v1) and try again."
+                "Auto-extract needs an LLM. Set one up in Settings → LLM Providers "
+                "(pick a provider, add its key, choose a model, Test) — or use local "
+                "Ollama / LM Studio for a fully offline setup — and make sure the "
+                "Glossary auto-extract skill is enabled in Settings → LLM Skills, "
+                "then try again."
             ),
         )
 
@@ -220,9 +226,9 @@ def auto_extract(project_id: str, req: AutoExtractRequest):
     )
 
     try:
-        res = client.chat.completions.create(
-            model=_llm_model(),
-            timeout=_llm_timeout(),
+        res = handle.client.chat.completions.create(
+            model=handle.model,
+            timeout=handle.timeout,
             messages=[
                 {"role": "system", "content": system},
                 {"role": "user", "content": user},
@@ -231,9 +237,18 @@ def auto_extract(project_id: str, req: AutoExtractRequest):
         body = (res.choices[0].message.content or "").strip()
     except Exception as e:
         logger.warning("auto-extract LLM call failed: %s", e)
+        # Scrub the provider error — some OpenAI-compatible providers echo the
+        # API key or a user_id in the body, which must not reach the UI verbatim.
+        from core.scrub import scrub_provider_error
+        from services import llm_providers
+        _p = llm_providers.active_provider()
+        _key = llm_providers.resolve_api_key(_p) if _p else None
         raise HTTPException(
             status_code=502,
-            detail=f"LLM didn't respond. Check Settings → Logs → Backend for the trace. Error: {e}",
+            detail=(
+                "LLM didn't respond. Check Settings → Logs → Backend for the trace. "
+                f"Error: {scrub_provider_error(e, _key)}"
+            ),
         )
 
     # Parse: SOURCE || TARGET || note (lines are allowed to be sloppy — we're forgiving).

backend/api/routers/openai_compat.py

@@ -237,10 +237,10 @@ def _run_tts(backend, text: str, kw: dict):
     sr = backend.sample_rate
     # Engines that already emit mastered, studio-grade audio (e.g. VoxCPM2's
     # native 48 kHz) opt out of apply_mastering via `applies_own_mastering`.
-    # That chain's Compressor + 8% Reverb is tuned for OmniVoice's 24 kHz clone
-    # output; applied to a studio engine it adds an audible level pump and a
-    # reverb tail that degrade the very output we want clean. Loudness
-    # normalisation still runs — it's a benign peak scale, not dynamics.
+    # That chain's highpass + Compressor is tuned for OmniVoice's 24 kHz clone
+    # output; applied to a studio engine it adds an audible level pump that
+    # degrades the very output we want clean. Loudness normalisation still
+    # runs — it's a benign peak scale, not dynamics.
     if not getattr(backend, "applies_own_mastering", False):
         wav = apply_mastering(wav, sample_rate=sr)
     wav = normalize_audio(wav, target_dBFS=-2.0)

backend/api/routers/profiles.py

@@ -73,6 +73,17 @@ async def create_profile(
                 raise ValueError("not an object")
         except ValueError:
             raise HTTPException(status_code=422, detail="vd_states must be a JSON object")
+        # Root-cause close for #983: a design profile must never be PERSISTED
+        # with a partial vd_states shape, regardless of which client (older
+        # frontend build, hand-edited payload, third-party API caller) created
+        # it — a missing category key crashes DesignMethodPanel's render on
+        # every future client that selects this profile. CATEGORY_ORDER is the
+        # same single source of truth the frontend's CATEGORIES keys mirror
+        # (core/describe_voice.py), so this can't drift from the picker.
+        from core.describe_voice import CATEGORY_ORDER
+        for _cat in CATEGORY_ORDER:
+            parsed.setdefault(_cat, "Auto")
+        vd_states = _json.dumps(parsed)
         # An all-Auto design (every category left on "Auto") yields an empty
         # instruct — that's still a valid, saveable voice: synthesis falls back
         # to neutral instruct-only conditioning (see generation.py design path).

backend/api/routers/settings.py

@@ -12,6 +12,7 @@ The state endpoint duplicates `/system/hf-token/state` (which lives on
 """
 from __future__ import annotations
 
+import asyncio
 import logging
 import os
 from dataclasses import asdict
@@ -134,12 +135,22 @@ class _RefinementBody(BaseModel):
 
 
 def _refinement_state():
-    from services.refinement import get_refinement_config
-    from services.llm_backend import get_active_llm_backend
+    from services.refinement import (
+        _skill_llm,
+        get_last_refine_status,
+        get_refinement_config,
+    )
 
     cfg = get_refinement_config()
-    # The UI shows whether refinement can actually run (needs an LLM).
-    cfg["llm_ready"] = get_active_llm_backend().id != "off"
+    # `llm_ready` only means "an endpoint is CONFIGURED" — a placeholder/dead
+    # endpoint still reads ready. It's resolved through the LLM Skills registry
+    # so a disabled dictation_refinement skill / per-skill provider override
+    # reads the same here as on the actual refine path. The honesty layer is
+    # `last_refine_status`: {ok, reason, at} from the most recent final, so the
+    # panel can flag a configured-but-failing LLM (the real safety is the hard
+    # refine timeout, which keeps a dead endpoint from ever stalling the final).
+    cfg["llm_ready"] = _skill_llm().id != "off"
+    cfg["last_refine_status"] = get_last_refine_status()
     return cfg
 
 
@@ -271,7 +282,8 @@ def save_llm_provider(provider_id: str, body: _LLMProviderBody):
     A None field is left unchanged; an empty api_key clears the stored key.
     """
     from services import llm_providers
-    if llm_providers.get_provider(provider_id) is None:
+    p = llm_providers.get_provider(provider_id)
+    if p is None:
         raise HTTPException(status_code=404, detail=f"unknown provider {provider_id!r}")
     if body.api_key is not None:
         llm_providers.save_key(provider_id, body.api_key.strip())
@@ -279,7 +291,17 @@ def save_llm_provider(provider_id: str, body: _LLMProviderBody):
         provider_id, base_url=body.base_url, model=body.model,
         account_id=body.account_id,
     )
-    if body.make_active:
+    # An explicit save also claims the active slot when the user has never
+    # chosen a provider (#963). Without this, a saved-and-tested local
+    # provider (Ollama/LM Studio) evaporates on restart: active_provider_id()
+    # deliberately excludes local providers from auto-select, so the plain
+    # "Save" left nothing persisted to resolve. Gated on the STORED selection
+    # only — an explicit prior choice is never stolen by a plain save, and an
+    # unconfigured provider can't claim the slot.
+    if body.make_active or (
+        llm_providers.stored_active_provider_id() is None
+        and llm_providers.is_configured(p)
+    ):
         llm_providers.set_active_provider(provider_id)
     return list_llm_providers()
 
@@ -293,13 +315,58 @@ def set_active_llm_provider(body: _LLMActiveBody):
     return list_llm_providers()
 
 
+def _scrub_llm_detail(e: Exception, api_key: str | None) -> str:
+    """Scrubbed, UI-safe failure text. scrub_text() covers env secrets and
+    home paths — but a STORE-persisted key isn't in the env, and some
+    providers echo the key in error bodies, so redact the exact resolved key
+    explicitly before the generic pass."""
+    from core.scrub import scrub_text
+    detail = f"{type(e).__name__}: {e}"
+    if api_key and api_key != "local" and len(api_key) >= 8:
+        detail = detail.replace(api_key, "•••")
+    return scrub_text(detail)
+
+
+def _classify_llm_error(e: Exception) -> str:
+    """Map a provider-call failure to an actionable kind the UI can localize.
+
+    Kinds: auth (bad/missing key), not_found (model or endpoint path),
+    rate_limit, network (DNS/conn/timeout), error (everything else).
+    Status codes win when the OpenAI SDK provides one; exception-family
+    names catch the non-HTTP failures (DNS, refused, TLS, timeout).
+    """
+    status = getattr(e, "status_code", None)
+    if status in (401, 403):
+        return "auth"
+    if status == 404:
+        return "not_found"
+    if status == 429:
+        return "rate_limit"
+    name = type(e).__name__
+    if name in ("APIConnectionError", "APITimeoutError", "ConnectError",
+                "ConnectTimeout", "TimeoutError"):
+        return "network"
+    if name == "AuthenticationError":
+        return "auth"
+    if name == "NotFoundError":
+        return "not_found"
+    if name == "RateLimitError":
+        return "rate_limit"
+    return "error"
+
+
 @router.post("/llm-providers/{provider_id}/test")
 def test_llm_provider(provider_id: str):
     """One cheap round-trip against a provider to prove the key/URL work.
 
     Temporarily activates the provider for the probe by resolving its config
-    directly (does not change the persisted active selection).
+    directly (does not change the persisted active selection). Returns
+    latency_ms plus, on failure, a classified ``kind`` (config / auth /
+    not_found / rate_limit / network / error) so the UI shows an actionable,
+    localizable message instead of a raw exception string.
     """
+    import time as _time
+
     from services import llm_providers
     p = llm_providers.get_provider(provider_id)
     if p is None:
@@ -307,22 +374,117 @@ def test_llm_provider(provider_id: str):
     base_url = llm_providers.resolve_base_url(p)
     api_key = llm_providers.resolve_api_key(p)
     if not base_url:
-        return {"ok": False, "detail": "No Base URL set for this provider."}
+        return {"ok": False, "kind": "config", "detail": "No Base URL set for this provider."}
     if not api_key:
-        return {"ok": False, "detail": "No API key configured for this provider."}
+        return {"ok": False, "kind": "config", "detail": "No API key configured for this provider."}
+    t0 = _time.monotonic()
     try:
         from openai import OpenAI
-        client = OpenAI(api_key=api_key, base_url=base_url)
+        # max_retries=0: this is an interactive probe with a live spinner — the
+        # SDK's default 2 automatic retries turn a 429/timeout into a ~34s hang.
+        # Surface the first failure immediately instead.
+        client = OpenAI(api_key=api_key, base_url=base_url, max_retries=0)
         res = client.chat.completions.create(
             model=llm_providers.resolve_model(p),
             messages=[{"role": "user", "content": "Reply with the single word: ok"}],
             timeout=20,
         )
         reply = (res.choices[0].message.content or "").strip()
-        return {"ok": True, "model": llm_providers.resolve_model(p), "reply": reply[:80]}
+        return {
+            "ok": True,
+            "model": llm_providers.resolve_model(p),
+            "reply": reply[:80],
+            "latency_ms": int((_time.monotonic() - t0) * 1000),
+        }
     except Exception as e:  # noqa: BLE001 — surface a clean, scrubbed error to the UI
-        from core.scrub import scrub_text
-        return {"ok": False, "detail": scrub_text(f"{type(e).__name__}: {e}")}
+        return {
+            "ok": False,
+            "kind": _classify_llm_error(e),
+            "detail": _scrub_llm_detail(e, api_key),
+            "latency_ms": int((_time.monotonic() - t0) * 1000),
+        }
+
+
+@router.get("/llm-providers/{provider_id}/models")
+def list_llm_provider_models(provider_id: str):
+    """List model ids the provider's key can access (OpenAI-compat /models).
+
+    Powers the model-picker datalist in Settings → LLM Providers so users
+    don't have to guess model names. Read-only; failures return the same
+    classified shape as /test; capped so a huge catalog can't bloat the UI.
+    """
+    from services import llm_providers
+    p = llm_providers.get_provider(provider_id)
+    if p is None:
+        raise HTTPException(status_code=404, detail=f"unknown provider {provider_id!r}")
+    base_url = llm_providers.resolve_base_url(p)
+    api_key = llm_providers.resolve_api_key(p)
+    if not base_url or not api_key:
+        return {"ok": False, "kind": "config", "models": []}
+    try:
+        from openai import OpenAI
+        # max_retries=0: interactive probe — fail fast, don't burn ~34s on the
+        # SDK's default retry ladder when the key/URL is wrong (matches /test).
+        client = OpenAI(api_key=api_key, base_url=base_url, max_retries=0)
+        ids = sorted(m.id for m in client.models.list(timeout=10))
+        # Cap so a huge catalog can't bloat the datalist; flag the cap so the UI
+        # can say "first 200 shown" rather than implying it's the full list.
+        return {"ok": True, "models": ids[:200], "truncated": len(ids) > 200}
+    except Exception as e:  # noqa: BLE001
+        return {
+            "ok": False,
+            "kind": _classify_llm_error(e),
+            "detail": _scrub_llm_detail(e, api_key),
+            "models": [],
+        }
+
+
+# ── LLM Skills (Settings → LLM Skills) ─────────────────────────────────────
+# Per-feature enable/route control for every LLM consumption point. Each
+# skill can be toggled off (degrades exactly like "no LLM configured") or
+# routed to a specific provider (local Ollama/LM Studio vs a remote key)
+# instead of the one global active provider. Loopback-gated (router dep).
+
+
+class _LLMSkillBody(BaseModel):
+    enabled: bool | None = Field(None, description="None leaves the toggle unchanged")
+    provider_override: str | None = Field(
+        None,
+        description="provider id to route this skill to; '' or null clears "
+                    "it (skill follows the active provider). Omit to leave "
+                    "unchanged.",
+    )
+
+
+@router.get("/llm-skills")
+def list_llm_skills():
+    """Every LLM skill with its toggle, routing, and resolved ready status."""
+    from services import llm_skills
+    return {"skills": [llm_skills.describe(s.id) for s in llm_skills.all_skills()]}
+
+
+@router.put("/llm-skills/{skill_id}")
+def set_llm_skill(skill_id: str, body: _LLMSkillBody):
+    """Toggle a skill and/or set its provider routing.
+
+    Field semantics match the providers PUT: an omitted field is left
+    unchanged; ``provider_override: ""``/``null`` clears the override.
+    404 for an unknown skill or an unknown provider id.
+    """
+    from services import llm_skills
+    if llm_skills.get_skill(skill_id) is None:
+        raise HTTPException(status_code=404, detail=f"unknown LLM skill {skill_id!r}")
+    kwargs = {}
+    if body.enabled is not None:
+        kwargs["enabled"] = body.enabled
+    if "provider_override" in body.model_fields_set:
+        kwargs["provider_override"] = body.provider_override
+    try:
+        if kwargs:
+            llm_skills.configure_skill(skill_id, **kwargs)
+    except ValueError as e:
+        raise HTTPException(status_code=404, detail=str(e))
+    return list_llm_skills()
 
 
 # ── License acceptance (Phase 3 Plan 03-01 / TTS-05) ──────────────────────
@@ -488,6 +650,41 @@ def set_models_dir(body: _ModelsDirBody):
     return {"configured": path, "effective": _effective_models_dir(), "restart_required": True}
 
 
+# ── Storage report (Settings → Storage) ────────────────────────────────────
+# Per-volume disk totals + du-style sizes for everything the app owns (HF
+# model cache, app data subtotals, engine venvs, temp files) with server-side
+# warnings. Heavy directory walks run in a worker thread with per-category
+# deadlines and a 5-minute in-process cache (services.storage_report), so the
+# endpoint stays cheap on repeat Settings visits. Loopback-gated via the
+# router-level dep like every sibling.
+
+
+@router.get("/storage")
+async def get_storage_report(refresh: bool = Query(False)):
+    """Disk + per-category storage usage for the Settings → Storage panel.
+
+    `refresh=1` bypasses the 5-minute cache and rescans. `min_free_gb`
+    reuses the setup wizard's constant so both surfaces warn at the same
+    threshold.
+    """
+    from api.routers.setup.wizard import MIN_FREE_GB
+    from core.config import DATA_DIR
+    from services import storage_report
+
+    try:
+        return await asyncio.to_thread(
+            storage_report.get_report,
+            data_dir=DATA_DIR,
+            hf_cache_dir=_effective_models_dir(),
+            app_venv=storage_report.default_app_venv(),
+            min_free_gb=MIN_FREE_GB,
+            refresh=refresh,
+        )
+    except Exception:
+        logger.exception("storage report failed")
+        raise HTTPException(status_code=500, detail="Failed to compute storage report")
+
+
 # ── HF mirror endpoint (parity program Wave 4.3 / §R4 c) ──────────────────
 # Restricted-network users (e.g. behind the Great Firewall) need to point
 # huggingface_hub at a mirror. HF reads HF_ENDPOINT at import time, so a
@@ -530,6 +727,11 @@ def set_hf_mirror(body: _HFMirrorBody):
     url = (body.url or "").strip().rstrip("/")
     if url and not url.startswith(("http://", "https://")):
         raise HTTPException(status_code=400, detail="Mirror URL must start with http(s)://")
+    # Compare against the currently-persisted value (normalised the same way) so
+    # a no-op save doesn't nag the user to restart. Only a real change to the
+    # persisted endpoint can require a restart.
+    previous = (user_env.get_user_env(_HF_ENDPOINT_ENV) or "").strip().rstrip("/")
+    changed = url != previous
     try:
         if url:
             user_env.set_user_env(_HF_ENDPOINT_ENV, url)
@@ -540,6 +742,53 @@ def set_hf_mirror(body: _HFMirrorBody):
     except Exception:
         logger.exception("set_hf_mirror failed")
         raise HTTPException(status_code=500, detail="Failed to persist mirror setting")
-    # HF endpoint is read at import time by huggingface_hub, so the override
-    # is only guaranteed once the backend restarts.
-    return {"configured": url, "restart_required": True, "presets": _HF_MIRROR_PRESETS}
+    # Model Store downloads pick up the new mirror immediately — the download
+    # path resolves the endpoint per-call and we updated os.environ above. Only
+    # transformers-side model *loads* (which read HF_ENDPOINT at import time)
+    # need a restart, so restart_required is True ONLY when the value actually
+    # changed — a no-op re-save never asks for a restart.
+    return {"configured": url, "restart_required": changed, "presets": _HF_MIRROR_PRESETS}
+
+
+# ── Updates panel: shipped changelog + pre-migration DB backup state ────────
+# (feat/safe-updates). Both are read-only, local-first surfaces for
+# Settings → Updates: the "What's new" viewer reads the CHANGELOG.md that
+# ships with the app, and the backup line shows the newest pre-migration
+# snapshot written by core.db_backup before `alembic upgrade head` runs.
+
+
+@router.get("/changelog")
+def get_changelog(limit_versions: int = Query(5, ge=1, le=50)):
+    """Structured release notes from the shipped CHANGELOG.md (newest first).
+
+    Bullets are raw markdown-lite (bold leads, `code`, (#NNN) refs) — the
+    frontend renders them safely without HTML. `available: false` when this
+    install has no changelog (never an error: the viewer just hides)."""
+    from core import changelog
+
+    path = changelog.changelog_path()
+    if not path:
+        return {"available": False, "releases": []}
+    try:
+        with open(path, encoding="utf-8") as fh:
+            releases = changelog.parse_changelog(fh.read(), limit_versions)
+    except Exception:
+        logger.exception("changelog parse failed")
+        return {"available": False, "releases": []}
+    return {"available": bool(releases), "releases": releases}
+
+
+@router.get("/db-backup")
+def get_db_backup_state():
+    """Newest pre-migration database backup (or none yet). Feeds the
+    "your data is backed up before every update" line in Settings → Updates."""
+    from core import db_backup
+    from core.config import DB_PATH
+
+    latest = db_backup.latest_backup(DB_PATH)
+    return {
+        "available": latest is not None,
+        "latest": latest,
+        "count": len(db_backup.list_backups(DB_PATH)),
+        "keep": db_backup.KEEP_BACKUPS,
+    }

backend/api/routers/setup/download.py

@@ -29,6 +29,7 @@ from .models import (  # noqa: F401
     KNOWN_MODELS,
     invalidate_cache,
     snapshot_has_weights,
+    disk_space_error,
     _MIN_WEIGHT_BYTES,
     _WEIGHT_FLOORS,
 )
@@ -404,6 +405,26 @@ async def install_model(req: InstallModelRequest):
             try:
                 _plan = snapshot_download(**_preflight_kwargs)
                 _summary = compute_plan(_plan)
+                # Disk-space guard (before a single byte flows): the preflight
+                # gives an exact "to download" size, so reject an install that
+                # would overrun the cache volume — with the numbers named —
+                # instead of failing mid-download with a cryptic OSError. No-op
+                # when it fits or the size is unknown. Same on every platform.
+                _disk_err = disk_space_error(_summary["to_download_bytes"])
+                if _disk_err:
+                    logger.info("model install %s: rejected — %s", req.repo_id, _disk_err)
+                    _resolving.set()  # stop the heartbeat thread before we bail
+                    hf_progress.emit({
+                        "repo_id": req.repo_id,
+                        "filename": req.repo_id,
+                        "downloaded": 0, "total": 0, "pct": 0.0,
+                        "phase": "install_error",
+                        "error": _disk_err,
+                    })
+                    # A disk-full is not a transient network failure — don't set
+                    # a cooldown (freeing space, not waiting, is the fix). The
+                    # outer finally still cleans up the aggregator + context.
+                    return
                 download_aggregator.start(
                     req.repo_id,
                     total_bytes=_summary["to_download_bytes"],
@@ -507,12 +528,18 @@ async def install_model(req: InstallModelRequest):
             logger.info("model install failed for %s: %s", req.repo_id, e)
             import time as _time_fail
             _install_cooldowns[req.repo_id] = _time_fail.time()
+            # #874: when the install failed because the configured HF mirror is
+            # unreachable, name the mirror + the setting instead of leaking the
+            # raw connectivity error. #959: likewise for the SOCKS-proxy class
+            # (missing socksio fails the download's session construction).
+            # No-op for every other failure.
+            from core.failure import append_hint
             hf_progress.emit({
                 "repo_id": req.repo_id,
                 "filename": req.repo_id,
                 "downloaded": 0, "total": 0, "pct": 0.0,
                 "phase": "install_error",
-                "error": str(e),
+                "error": append_hint(str(e)),
             })
         finally:
             _cancelled.discard(req.repo_id)

backend/api/routers/setup/models.py

@@ -123,6 +123,66 @@ def hf_cache_dir() -> str:
     )
 
 
+# ── Disk-space guard (shared, single-sourced) ──────────────────────────────
+# MIN_FREE_GB is the headroom we insist on keeping free on the model-cache
+# volume — the wizard's absolute pre-install floor AND the extra buffer the
+# per-install check demands on top of the download itself, so an "Install all"
+# can't fill the disk to the brim (setup/download.py). Lives here — the lowest
+# module in the setup import graph — so the wizard, the /models header, and the
+# install endpoint can't drift apart (mirrors the weight-floor single-sourcing).
+_GIB = 1024 ** 3
+MIN_FREE_GB = 10
+
+
+def disk_free_bytes(path: "str | None" = None) -> int:
+    """Free bytes on the volume backing *path* (defaults to the HF cache).
+
+    Walks up to the nearest existing ancestor so a not-yet-created cache dir
+    still probes the correct mount point. ``shutil.disk_usage`` is cross-platform
+    (macOS/Windows/Linux) so this behaves identically everywhere. Never raises.
+    """
+    import shutil
+    try:
+        p = Path(path or hf_cache_dir()).resolve()
+        while not p.exists():
+            parent = p.parent
+            if parent == p:  # reached the volume root
+                break
+            p = parent
+        return int(shutil.disk_usage(str(p)).free)
+    except Exception:
+        return 0
+
+
+def disk_space_error(to_download_bytes: "int | None", *, cache_dir: "str | None" = None) -> "str | None":
+    """Actionable message when *to_download_bytes* (+ MIN_FREE_GB headroom) won't
+    fit on the cache volume; ``None`` when it fits, the size is unknown, or the
+    volume can't be probed (never block on missing information).
+
+    Names the three numbers a user needs to act — needs X, headroom Y, have Z —
+    so "Install all" can't silently overrun the disk (issue: no pre-install disk
+    check). Platform-agnostic; applied identically on macOS/Windows/Linux.
+    """
+    if not to_download_bytes or to_download_bytes <= 0:
+        return None  # unknown plan (older/gated repo, mirror without dry-run) → don't block
+    cache = cache_dir or hf_cache_dir()
+    free = disk_free_bytes(cache)
+    if free <= 0:
+        return None  # couldn't probe the volume → don't block on missing info
+    required = int(to_download_bytes) + MIN_FREE_GB * _GIB
+    if free >= required:
+        return None
+
+    def _gb(n: int) -> str:
+        return f"{n / _GIB:.1f} GB"
+
+    return (
+        f"Not enough disk space to install: this download needs {_gb(int(to_download_bytes))} "
+        f"plus {MIN_FREE_GB} GB free headroom ({_gb(required)} total), but only {_gb(free)} "
+        f"is free at {cache}. Free up space (or move the model cache to a bigger volume) and retry."
+    )
+
+
 def _repo_dir_name(repo_id: str) -> str:
     """HF cache dir name for a repo: 'k2-fsa/OmniVoice' → 'models--k2-fsa--OmniVoice'."""
     return "models--" + repo_id.replace("/", "--")
@@ -391,6 +451,10 @@ def list_models():
         "models": out,
         "total_installed_bytes": sum(m["size_on_disk_bytes"] for m in out),
         "hf_cache_dir": hf_cache_dir(),
+        # Free space on the cache volume, so the Model Store header can warn
+        # BEFORE an "Install all" overruns the disk (pairs with the per-install
+        # disk_space_error guard in setup/download.py).
+        "disk_free_gb": round(disk_free_bytes() / _GIB, 1),
         "platform_tags": _current_platform_tags(),
     }
     _set_cache("models", response)

backend/api/routers/setup/wizard.py

@@ -18,33 +18,20 @@ import sys
 from fastapi import APIRouter
 
 from api.schemas import SetupStatusResponse, PreflightResponse
-from .models import REQUIRED_MODELS, hf_cache_dir, is_cached
+# MIN_FREE_GB + disk_free_bytes are single-sourced in ``.models`` (the lowest
+# module in the setup import graph) so the wizard gate, the /models header, and
+# the per-install disk guard can't drift apart.
+from .models import REQUIRED_MODELS, hf_cache_dir, is_cached, MIN_FREE_GB, disk_free_bytes
 
 logger = logging.getLogger("omnivoice.setup.wizard")
 router = APIRouter()
 
-MIN_FREE_GB = 10
-
 
 def _disk_free_gb(path: str) -> float:
-    """Return free GB on the volume containing *path*.
-
-    If *path* doesn't exist yet (e.g. after a fresh wipe), walk up to the
-    nearest existing ancestor so ``shutil.disk_usage`` can still probe the
-    correct mount point.
-    """
-    try:
-        from pathlib import Path
-        p = Path(path).resolve()
-        # Walk up until we find a directory that exists
-        while not p.exists():
-            parent = p.parent
-            if parent == p:  # root
-                break
-            p = parent
-        return _shutil.disk_usage(str(p)).free / (1024 ** 3)
-    except Exception:
-        return 0.0
+    """Free GB on the volume containing *path* (thin GB wrapper over the shared
+    ``models.disk_free_bytes``, which walks up to the nearest existing ancestor
+    for a not-yet-created path)."""
+    return disk_free_bytes(path) / (1024 ** 3)
 
 
 # ── Setup Status ───────────────────────────────────────────────────────────
@@ -181,16 +168,40 @@ def _detect_gpu() -> dict:
     return info
 
 
-def _probe_network(host: str = "huggingface.co", timeout: float = 2.0) -> bool:
+def _probe_network(host: str = "huggingface.co", port: int = 443, timeout: float = 2.0) -> bool:
     """Tiny TCP connect test."""
     import socket
     try:
-        with socket.create_connection((host, 443), timeout=timeout):
+        with socket.create_connection((host, port), timeout=timeout):
             return True
     except Exception:
         return False
 
 
+def _hf_endpoint_host() -> tuple[str, int]:
+    """Host/port of the Hugging Face endpoint actually in effect.
+
+    Mirror-aware: restricted-network users (e.g. behind the Great Firewall)
+    point HF_ENDPOINT at a mirror via Settings → Models → Hugging Face
+    mirror. Probing hardcoded huggingface.co would fail them even when their
+    configured mirror works fine.
+    """
+    try:
+        from core.failure import configured_hf_mirror
+        mirror = configured_hf_mirror()
+    except Exception:
+        mirror = ""
+    if mirror:
+        try:
+            from urllib.parse import urlsplit
+            u = urlsplit(mirror)
+            if u.hostname:
+                return u.hostname, u.port or (80 if u.scheme == "http" else 443)
+        except Exception:
+            pass
+    return "huggingface.co", 443
+
+
 def _ram_gb() -> float:
     try:
         import psutil
@@ -413,15 +424,49 @@ def preflight():
             "status": r_status, "detail": r_detail, "fix": r_fix,
         })
 
-    # ── Network
-    net_ok = _probe_network()
+    # ── Network — probes the HF endpoint actually in effect (mirror-aware),
+    # and a dead network is a WARNING, not a blocker. The app is local-first:
+    # already-downloaded models work offline, and a hard fail here dead-ends
+    # restricted-network users (e.g. China, where huggingface.co is blocked)
+    # on the very first screen — before they can reach the mirror setting
+    # that fixes it. Model downloads surface their own actionable errors.
+    net_host, net_port = _hf_endpoint_host()
+    net_ok = _probe_network(net_host, net_port)
+    mirror_reachable = False
+    if not net_ok and net_host == "huggingface.co":
+        # Official endpoint blocked — if the community mirror is reachable,
+        # tell the user exactly which switch unblocks them.
+        mirror_reachable = _probe_network("hf-mirror.com")
+    if net_ok:
+        net_fix = None
+    elif mirror_reachable:
+        net_fix = (
+            "huggingface.co is blocked on this network, but the hf-mirror.com "
+            "community mirror is reachable — apply it below and re-check. "
+            "Model downloads will use the mirror immediately."
+        )
+    elif net_host != "huggingface.co":
+        net_fix = (
+            f"Your configured Hugging Face mirror ({net_host}) is unreachable "
+            "— it may be down or blocked. Pick another mirror or the official "
+            "endpoint below, or continue offline: models already downloaded "
+            "keep working."
+        )
+    else:
+        net_fix = (
+            "Check internet connection, VPN, or corporate firewall whitelist "
+            "for huggingface.co. You can continue — models already downloaded "
+            "keep working offline; new downloads need a connection or a "
+            "mirror (configurable below)."
+        )
     checks.append({
-        "id": "network", "label": "Network (huggingface.co)",
-        "status": "pass" if net_ok else "fail",
-        "detail": "Reachable" if net_ok else "Unreachable on port 443",
-        "fix": None if net_ok else
-            "Check internet connection, VPN, or corporate firewall "
-            "whitelist for huggingface.co.",
+        "id": "network", "label": f"Network ({net_host})",
+        "status": "pass" if net_ok else "warn",
+        "detail": "Reachable" if net_ok else f"Unreachable on port {net_port}",
+        "fix": net_fix,
+        # Frontend affordance hint: the wizard offers the mirror quick-pick
+        # when the endpoint is unreachable (PreflightCheck allows extras).
+        "mirror_reachable": mirror_reachable,
     })
 
     # Aggregate

backend/api/routers/tools.py

@@ -77,6 +77,10 @@ async def probe(req: ProbeReq):
 class IncrementalReq(BaseModel):
     segments: list[dict]
     stored_hashes: Optional[dict[str, str]] = None
+    # P1.3 — the ACTIVE track's language code. When set, fingerprints are
+    # scoped to that language (pass that language's stored hashes alongside);
+    # omitted → legacy language-agnostic hashing, kept for old callers.
+    lang: Optional[str] = None
 
 
 @router.post("/tools/incremental")
@@ -84,6 +88,7 @@ def plan_incremental(req: IncrementalReq):
     return incremental.plan_incremental(
         req.segments,
         stored_hashes=req.stored_hashes or {},
+        track_lang=req.lang,
     )
 
 

backend/core/changelog.py

@@ -0,0 +1,138 @@
+"""Parse the shipped CHANGELOG.md into structured release notes.
+
+Feeds ``GET /api/settings/changelog`` — the Settings → Updates "What's new"
+viewer. Local-first by design: the changelog ships with the app (repo root in
+dev; copied into the packaged project dir by the Tauri bootstrap alongside
+README.md), so the viewer works fully offline.
+
+The house format (see CHANGELOG.md / the release-notes hard rule):
+
+    ## [X.Y.Z] — DATE
+    one-paragraph headline (the "intro")
+    ### Added / Fixed / Changed / ...
+    - **Bold one-line lead.** 1-3 lines of plain-English why. (#NNN)
+
+Bullets may be a single long line (recent sections) *or* hard-wrapped across
+indented continuation lines (older sections) — the parser normalizes both to
+one logical line per bullet. Bullets stay raw markdown-lite; the frontend's
+safe renderer handles **bold** / `code` / (#NNN) refs.
+"""
+from __future__ import annotations
+
+import os
+import re
+
+#: ``## [0.3.9] — 2026-07-02`` (em/en dash or hyphen; date optional).
+_RELEASE_RE = re.compile(r"^##\s+\[(?P<version>[^\]]+)\]\s*(?:[—–-]\s*(?P<date>.+?))?\s*$")
+_SECTION_RE = re.compile(r"^###\s+(?P<title>.+?)\s*$")
+_BULLET_RE = re.compile(r"^\s*[-*]\s+(?P<text>.*\S)\s*$")
+
+
+def changelog_path() -> str | None:
+    """The shipped CHANGELOG.md, or None when this install doesn't have one.
+
+    ``backend/core/changelog.py`` → two levels up is the project root: the
+    repo root in dev, and ``<env>/project`` in packaged installs (where the
+    bootstrap copies CHANGELOG.md next to README.md). ``OMNIVOICE_CHANGELOG``
+    overrides for tests/containers.
+    """
+    override = os.environ.get("OMNIVOICE_CHANGELOG")
+    if override:
+        return override if os.path.isfile(override) else None
+    here = os.path.dirname(os.path.abspath(__file__))
+    candidate = os.path.join(os.path.dirname(os.path.dirname(here)), "CHANGELOG.md")
+    return candidate if os.path.isfile(candidate) else None
+
+
+def _looks_like_release_version(version: str) -> bool:
+    """Only released ``X.Y.Z...`` sections (skip ``[Unreleased]`` etc.)."""
+    return bool(re.match(r"^v?\d", version.strip()))
+
+
+def parse_changelog(text: str, limit_versions: int = 5) -> list[dict]:
+    """CHANGELOG.md text → newest-first list of releases::
+
+        {"version": "0.3.9", "date": "2026-07-02", "intro": "…",
+         "sections": [{"title": "Fixed", "bullets": ["…", …]}, …]}
+
+    Tolerates both single-line bullets and older hard-wrapped bullets
+    (continuation lines are joined with a space). Content between the version
+    heading and the first ``###`` becomes ``intro`` (paragraphs joined by
+    blank lines).
+    """
+    releases: list[dict] = []
+    release: dict | None = None
+    section: dict | None = None
+    intro_parts: list[str] = []
+    bullet_open = False   # last bullet may still absorb continuation lines
+    intro_new_para = True
+
+    def close_release():
+        nonlocal release, section, intro_parts, bullet_open, intro_new_para
+        if release is not None:
+            release["intro"] = "\n\n".join(p for p in intro_parts if p)
+            release["sections"] = [s for s in release["sections"] if s["bullets"]]
+            releases.append(release)
+        release = None
+        section = None
+        intro_parts = []
+        bullet_open = False
+        intro_new_para = True
+
+    for raw in text.splitlines():
+        m = _RELEASE_RE.match(raw)
+        if m:
+            close_release()
+            if len(releases) >= limit_versions:
+                break
+            version = m.group("version").strip().lstrip("v")
+            if not _looks_like_release_version(version):
+                continue  # e.g. [Unreleased] — skip until the next heading
+            release = {
+                "version": version,
+                "date": (m.group("date") or "").strip(),
+                "intro": "",
+                "sections": [],
+            }
+            continue
+        if release is None:
+            continue
+
+        line = raw.strip()
+        if not line:
+            bullet_open = False
+            intro_new_para = True
+            continue
+
+        sm = _SECTION_RE.match(raw)
+        if sm:
+            section = {"title": sm.group("title"), "bullets": []}
+            release["sections"].append(section)
+            bullet_open = False
+            continue
+
+        bm = _BULLET_RE.match(raw)
+        if bm:
+            if section is None:
+                # Rare: a bullet before any ### heading — group it untitled.
+                section = {"title": "", "bullets": []}
+                release["sections"].append(section)
+            section["bullets"].append(bm.group("text"))
+            bullet_open = True
+            continue
+
+        if section is not None:
+            if bullet_open and section["bullets"]:
+                # Hard-wrapped bullet continuation (older sections) → join.
+                section["bullets"][-1] += " " + line
+            continue
+
+        # Headline paragraph(s) before the first ### section.
+        if intro_new_para or not intro_parts:
+            intro_parts.append(line)
+        else:
+            intro_parts[-1] += " " + line
+        intro_new_para = False
+
+    close_release()
+    return releases[:limit_versions]

backend/core/db.py

@@ -3,6 +3,8 @@ import sqlite3
 import logging
 from contextlib import contextmanager
 from core.config import DB_PATH
+from core import db_backup
+from core.version import APP_VERSION
 
 logger = logging.getLogger("omnivoice.db")
 
@@ -312,14 +314,88 @@ def init_db():
     _run_alembic_upgrade()
 
 
+class MigrationError(RuntimeError):
+    """A schema migration failed *while executing*. Startup must NOT continue
+    on a possibly half-migrated database — the caller lets this propagate so
+    the process stops with an actionable message naming the pre-migration
+    backup (see ``core.db_backup``). Restore is deliberately manual: silently
+    auto-restoring the snapshot could itself discard user data."""
+
+
+def _reconcile_after_alembic_skip() -> None:
+    """Converge the schema directly when alembic can't run at all (not
+    importable, or stamped at a removed revision — #552/#547) so additive
+    columns still land instead of 500-ing on `no such column`. Only for the
+    "nothing was applied" classes; a mid-migration failure must NOT reach
+    here (see MigrationError)."""
+    try:
+        conn = get_db()
+        try:
+            _reconcile_additive_columns(conn)
+        finally:
+            conn.close()
+    except Exception as exc:  # noqa: BLE001
+        logger.warning("schema reconcile after alembic skip also failed: %s", exc)
+
+
+def _stamped_revisions(db_path: str) -> set | None:
+    """Revisions recorded in ``alembic_version`` (empty set = never stamped),
+    or None when the DB can't be read."""
+    try:
+        conn = sqlite3.connect(db_path)
+        try:
+            try:
+                return {r[0] for r in conn.execute("SELECT version_num FROM alembic_version")}
+            except sqlite3.OperationalError:
+                return set()  # table absent — nothing ever stamped
+        finally:
+            conn.close()
+    except Exception:  # noqa: BLE001
+        return None
+
+
+def _plan_alembic(cfg) -> str:
+    """Decide what an ``upgrade head`` run would actually do:
+
+    - ``up_to_date``       — stamped at head; upgrade is a no-op.
+    - ``pending``          — migrations WILL execute (snapshot the DB first).
+    - ``unknown_revision`` — stamped at a revision this build doesn't ship
+      (preview→stable downgrade, #552/#547); upgrade would fail before
+      applying anything, so skip it and reconcile additively instead.
+    - ``indeterminate``    — can't tell; treat like pending (snapshot, run).
+    """
+    try:
+        from alembic.script import ScriptDirectory
+
+        script = ScriptDirectory.from_config(cfg)
+        known = {rev.revision for rev in script.walk_revisions()}
+        heads = set(script.get_heads())
+        stamped = _stamped_revisions(DB_PATH)
+        if stamped is None:
+            return "indeterminate"
+        if stamped and not stamped <= known:
+            return "unknown_revision"
+        if stamped == heads:
+            return "up_to_date"
+        return "pending"
+    except Exception:  # noqa: BLE001
+        return "indeterminate"
+
+
 def _run_alembic_upgrade() -> None:
-    """Best-effort `alembic upgrade head` on startup. Non-fatal: if alembic
-    isn't reachable (e.g. a stripped-down install) or its version is stamped at
-    a revision no longer in versions/ (e.g. after running a preview build), log
-    a warning and move on. The schema is still kept correct by
-    _reconcile_additive_columns (run in init_db above and again here on failure)
-    — CREATE TABLE IF NOT EXISTS alone does NOT add columns to a pre-existing
-    table, so the reconcile is what actually guarantees additive columns land."""
+    """`alembic upgrade head` on startup, wrapped in the data-safety net.
+
+    Failure classes are handled differently on purpose:
+
+    - alembic unavailable / stamped at an unknown revision → **non-fatal**
+      (nothing was applied; warn + `_reconcile_additive_columns` keeps the
+      schema converged, exactly the pre-existing #552/#547 behavior).
+    - migrations actually pending → the DB is snapshotted first
+      (``omnivoice.db.backup-<version>-<n>``, newest 3 kept), then upgraded.
+    - a migration fails **while executing** → raise :class:`MigrationError`:
+      startup stops with a message naming the backup, instead of silently
+      running the app on a half-migrated DB.
+    """
     try:
         import os
         from alembic import command
@@ -335,18 +411,62 @@ def _run_alembic_upgrade() -> None:
             return
         cfg = Config(ini)
         cfg.set_main_option("sqlalchemy.url", f"sqlite:///{DB_PATH}")
+    except Exception as exc:  # noqa: BLE001 — alembic not importable / bad ini
+        logger.warning("alembic upgrade head skipped: %s", exc)
+        _reconcile_after_alembic_skip()
+        return
+
+    plan = _plan_alembic(cfg)
+    if plan == "up_to_date":
+        return
+    if plan == "unknown_revision":
+        logger.warning(
+            "alembic_version is stamped at a revision this build doesn't ship "
+            "(preview/newer build ran on this DB) — skipping alembic and "
+            "reconciling the schema additively (#552/#547)"
+        )
+        _reconcile_after_alembic_skip()
+        return
+
+    # Migrations may actually execute: snapshot the DB first so a failed or
+    # interrupted migration can never cost user data. A backup problem alone
+    # must not brick startup (the >500 MB skip is by design), so log and go on.
+    # ``db_backup``/``APP_VERSION`` are module-level imports (top of file), not
+    # re-imported here: a test that patches ``core.db_backup.MAX_BACKUP_DB_BYTES``
+    # on the object it imported at collection must see the same object this
+    # function uses. A lazy ``from core import db_backup`` would re-resolve
+    # through the (possibly re-imported) ``core`` package and silently miss the
+    # patch after another suite purged ``core.*`` from ``sys.modules``.
+    backup_path = None
+    try:
+        backup_path = db_backup.snapshot_before_migration(DB_PATH, APP_VERSION)
+    except Exception:  # noqa: BLE001
+        logger.exception("Pre-migration DB backup failed — continuing without one")
+
+    try:
         command.upgrade(cfg, "head")
     except Exception as exc:
-        # Don't block startup on a migration tooling problem. Converge the schema
-        # directly so a swallowed failure (alembic not importable, or
-        # alembic_version stamped at a removed revision) still lands the additive
-        # columns instead of 500-ing on `no such column` (#552/#547).
-        logger.warning("alembic upgrade head skipped: %s", exc)
-        try:
-            conn = get_db()
-            try:
-                _reconcile_additive_columns(conn)
-            finally:
-                conn.close()
-        except Exception as exc2:  # noqa: BLE001
-            logger.warning("schema reconcile after alembic failure also failed: %s", exc2)
+        if "Can't locate revision" in str(exc):
+            # Belt for an unknown-revision case _plan_alembic missed: alembic
+            # bails before applying anything, so the old non-fatal path is safe.
+            logger.warning("alembic upgrade head skipped: %s", exc)
+            _reconcile_after_alembic_skip()
+            return
+        backup_note = (
+            f"A backup of your data from just before the migration is at: {backup_path}"
+            if backup_path
+            else "No pre-migration backup was written this run (see the log above)"
+        )
+        msg = (
+            f"Database migration failed while running: {exc}. "
+            f"OmniVoice stopped instead of running on a partially migrated database, "
+            f"and nothing was auto-restored (your database at {DB_PATH} was left "
+            f"exactly as the failed migration left it). "
+            f"{backup_note}. "
+            "What to do: relaunch to retry; if it keeps failing, report it at "
+            "https://github.com/debpalash/OmniVoice-Studio/issues (keep the backup file). "
+            "To roll back manually: quit the app, replace omnivoice.db with the backup "
+            "file, and reinstall the previous version."
+        )
+        logger.error(msg)
+        raise MigrationError(msg) from exc

backend/core/db_backup.py

@@ -0,0 +1,169 @@
+"""Pre-migration SQLite safety net (data-safe updates).
+
+Before ``alembic upgrade head`` applies *pending* migrations at startup —
+which is exactly the first launch of a new app version that changed the
+schema — the live database is snapshotted next to itself as
+``omnivoice.db.backup-<version>-<n>`` so a failed or interrupted migration
+can never cost user data (voices, projects, history, settings).
+
+Design rules (owner intent: "never corrupt/erase user data on update"):
+
+- Snapshots use the SQLite online-backup API (``sqlite3.Connection.backup``),
+  not a file copy — the live DB runs in WAL mode, so a plain copy could miss
+  everything still sitting in ``omnivoice.db-wal``.
+- Only the most recent ``KEEP_BACKUPS`` snapshots are kept; older ones are
+  pruned so backups can't grow without bound.
+- DBs larger than ``MAX_BACKUP_DB_BYTES`` are skipped with a log line (a
+  multi-hundred-MB copy on every schema upgrade is worse than the risk it
+  hedges on those installs).
+- Restore is NEVER automatic. On migration failure the caller
+  (``core.db._run_alembic_upgrade``) stops startup and names the backup path
+  so the user (or a support thread) decides — a silent auto-restore could
+  itself discard data written after the snapshot.
+"""
+from __future__ import annotations
+
+import logging
+import os
+import re
+import sqlite3
+import time
+
+logger = logging.getLogger("omnivoice.db.backup")
+
+#: Keep this many snapshots; older ones are pruned after each new snapshot.
+KEEP_BACKUPS = 3
+
+#: Skip the snapshot (with a log line) when the DB exceeds this size.
+MAX_BACKUP_DB_BYTES = 500 * 1024 * 1024
+
+#: ``<db name>.backup-<version>-<n>`` — ``<version>`` may itself contain
+#: dashes (preview builds stamp ``0.3.9-41``), so the counter is the final
+#: ``-<digits>`` group.
+_BACKUP_SUFFIX_RE = re.compile(r"\.backup-(?P<version>.+)-(?P<n>\d+)$")
+
+
+def _sanitize_version(version: str) -> str:
+    """Version string → filesystem-safe fragment (defense in depth; real
+    versions are semver and already safe)."""
+    safe = re.sub(r"[^A-Za-z0-9._-]", "_", str(version).strip()) or "unknown"
+    return safe[:64]
+
+
+def list_backups(db_path: str) -> list[str]:
+    """All backup files for ``db_path``, newest first (mtime desc)."""
+    directory = os.path.dirname(os.path.abspath(db_path)) or "."
+    base = os.path.basename(db_path)
+    try:
+        names = os.listdir(directory)
+    except OSError:
+        return []
+    out = []
+    for name in names:
+        if not name.startswith(base + ".backup-"):
+            continue
+        if not _BACKUP_SUFFIX_RE.search(name[len(base):]):
+            continue
+        out.append(os.path.join(directory, name))
+    out.sort(key=lambda p: (_mtime(p), p), reverse=True)
+    return out
+
+
+def _mtime(path: str) -> float:
+    try:
+        return os.path.getmtime(path)
+    except OSError:
+        return 0.0
+
+
+def latest_backup(db_path: str) -> dict | None:
+    """Newest backup as ``{"path", "created_at", "size_bytes"}`` or None."""
+    backups = list_backups(db_path)
+    if not backups:
+        return None
+    path = backups[0]
+    try:
+        st = os.stat(path)
+    except OSError:
+        return None
+    return {"path": path, "created_at": st.st_mtime, "size_bytes": st.st_size}
+
+
+def _next_counter(db_path: str, safe_version: str) -> int:
+    """Next free ``<n>`` for this version so a re-run never overwrites an
+    earlier snapshot of the same version."""
+    base = os.path.basename(db_path)
+    prefix = f"{base}.backup-{safe_version}-"
+    highest = 0
+    for path in list_backups(db_path):
+        name = os.path.basename(path)
+        if not name.startswith(prefix):
+            continue
+        tail = name[len(prefix):]
+        if tail.isdigit():
+            highest = max(highest, int(tail))
+    return highest + 1
+
+
+def prune_backups(db_path: str, keep: int = KEEP_BACKUPS) -> list[str]:
+    """Delete all but the ``keep`` newest backups. Returns deleted paths."""
+    deleted = []
+    for path in list_backups(db_path)[keep:]:
+        try:
+            os.remove(path)
+            deleted.append(path)
+            logger.info("Pruned old DB backup %s", path)
+        except OSError as exc:
+            logger.warning("Could not prune old DB backup %s: %s", path, exc)
+    return deleted
+
+
+def snapshot_before_migration(db_path: str, version: str) -> str | None:
+    """Snapshot ``db_path`` to ``<db>.backup-<version>-<n>``.
+
+    Returns the backup path, or None when skipped (no DB yet, or DB larger
+    than ``MAX_BACKUP_DB_BYTES``). Raises on an actual backup failure so the
+    caller can decide (the caller treats that as "continue without a backup",
+    logged loudly — a backup problem must not brick startup by itself).
+    """
+    if not os.path.isfile(db_path):
+        logger.debug("No DB at %s yet — nothing to back up", db_path)
+        return None
+    size = os.path.getsize(db_path)
+    if size > MAX_BACKUP_DB_BYTES:
+        logger.info(
+            "Skipping pre-migration DB backup: %s is %.0f MB (> %.0f MB limit)",
+            db_path, size / (1024 * 1024), MAX_BACKUP_DB_BYTES / (1024 * 1024),
+        )
+        return None
+
+    safe_version = _sanitize_version(version)
+    target = f"{db_path}.backup-{safe_version}-{_next_counter(db_path, safe_version)}"
+    tmp = f"{target}.part-{os.getpid()}"
+    src = sqlite3.connect(db_path)
+    try:
+        dst = sqlite3.connect(tmp)
+        try:
+            # Online backup: consistent snapshot including WAL contents.
+            src.backup(dst)
+            dst.commit()
+        finally:
+            dst.close()
+    except BaseException:
+        try:
+            os.remove(tmp)
+        except OSError:
+            pass
+        raise
+    finally:
+        src.close()
+    os.replace(tmp, target)
+    # A same-second rotation must still rank the new file newest.
+    try:
+        now = time.time()
+        os.utime(target, (now, now))
+    except OSError:
+        pass
+    logger.info("Pre-migration DB backup written: %s (%.1f MB)", target, size / (1024 * 1024))
+    prune_backups(db_path)
+    return target

backend/core/error_journal.py

@@ -76,6 +76,12 @@ _CLASS_RULES: tuple[tuple[str, tuple[str, ...]], ...] = (
         "connection refused",
         "connection reset",
         "connection aborted",
+        # transformers' download-failure wording ("We couldn't connect to
+        # '<endpoint>' to load the files") — the #874 mirror-down class was
+        # journaled as UNKNOWN without these.
+        "couldn't connect to",
+        "could not connect to",
+        "max retries exceeded",
         "timed out",
         "timeout",
         "name or service not known",

backend/core/failure.py

@@ -21,6 +21,7 @@ import re
 import sys
 from pathlib import Path
 from typing import Any, Optional
+from urllib.parse import urlsplit
 
 from core import error_docs_map
 from core.logging_filter import REDACTED, _HF_TOKEN_RE
@@ -39,12 +40,164 @@ _HINTS: dict[str, str] = {
     "PYANNOTE_LICENSE_REQUIRED": "Accept the pyannote model licenses on Hugging Face, then retry.",
     "COMPUTE_TYPE_UNSUPPORTED": "Your GPU doesn't support float16 — OmniVoice retried on int8. If transcription still fails, set OMNIVOICE/ASR_COMPUTE_TYPE=int8 or use CPU.",
     "TRANSFORMERS_IMPORT": "Your transformers install is incomplete. Reinstall it (`uv pip install --reinstall transformers`) or switch ASR to faster-whisper (Settings → Models).",
+    "OS_INVALID_ARGUMENT": "The OS rejected a file operation (Errno 22 / invalid argument) — in the transcribe path this is the temporary WAV write before ASR. It's almost always the temp directory: missing, read-only, on a full or removed drive, or blocked by antivirus. Check that your system TEMP/TMP folder exists and is writable and the drive has free space (add an OmniVoice antivirus exclusion if you use one), then retry.",
+    "SOCKS_PROXY_SUPPORT_MISSING": "A SOCKS proxy is configured in your environment (ALL_PROXY/HTTPS_PROXY=socks5://…) and the backend's HTTP client is missing SOCKS support. Newer OmniVoice builds ship SOCKS support (the socksio package) — update the app. If you still see this, unset ALL_PROXY/HTTPS_PROXY for OmniVoice, or run `uv pip install 'httpx[socks]'` in the backend venv, then restart.",
+    "SSL_HANDSHAKE_FAILURE": "A corporate or antivirus proxy is intercepting HTTPS traffic and re-signing certificates with its own CA — your OS trusts that CA, but Python's bundled certifi CA list doesn't, so the TLS handshake fails even though the connection reached the server. Newer OmniVoice builds trust the OS certificate store at startup (the truststore package), which should already fix this — update the app and retry. If you still see this, add an HTTPS-scanning exclusion for OmniVoice/Python in your antivirus, or ask IT for the proxy's CA bundle and set SSL_CERT_FILE to it, then restart.",
     "UNSUPPORTED_VIDEO_URL": "This link isn't a directly downloadable video. Paste a direct video page (e.g. a youtube.com/watch?v=… or douyin.com/video/<id> link), not a share/profile/feed link — or download the file and drop it in directly.",
     "VIDEO_DOWNLOAD_NETWORK": "The connection to the video server dropped mid-download (often a transient CDN/network blip or a regional rate-limit). Just retry — OmniVoice already cleaned up the partial download. If it keeps failing, check your network/VPN.",
     "BROKEN_VENV": "The Python backend environment was moved or damaged. OmniVoice rebuilds it automatically on the next launch; if it keeps failing, use Clean & Retry on the setup screen.",
+    # HF_MIRROR_UNREACHABLE has a DYNAMIC hint (it names the configured mirror)
+    # — see hf_mirror_hint(); build_failure special-cases it.
 }
 
 
+# ── HF mirror connectivity (#874) ────────────────────────────────────────────
+# When a non-default HF_ENDPOINT (a mirror, e.g. hf-mirror.com — set via
+# Settings → Models → Hugging Face mirror) is configured and a model
+# download/load fails with a connectivity error, the raw transformers/hf_hub
+# message ("We couldn't connect to 'https://hf-mirror.com' to load the files…")
+# gives the user no next step. This is the single classifier for that class,
+# shared by every surface: build_failure() (model status, dub/task events),
+# the global 500 handler (main.py — covers /generate and every other route
+# that can leak a model-load error), and the model-install SSE
+# (setup/download.py).
+
+_OFFICIAL_HF_ENDPOINTS = {"https://huggingface.co", "https://hf.co"}
+
+# Connectivity signatures across the layers an HF download failure surfaces
+# from: transformers' wording, huggingface_hub errors, requests/urllib3, and
+# raw socket/DNS failures (Linux/macOS/Windows variants).
+_HF_CONNECTIVITY_SIGNATURES = (
+    "couldn't connect to",             # transformers: "We couldn't connect to '<endpoint>' …"
+    "could not connect to",
+    "connection error",                # huggingface_hub / requests
+    "connection refused",
+    "connection reset",
+    "connection aborted",
+    "max retries exceeded",            # urllib3 via requests
+    "failed to establish a new connection",
+    "name or service not known",       # Linux DNS
+    "temporary failure in name resolution",
+    "nodename nor servname provided",  # macOS DNS
+    "getaddrinfo failed",              # Windows DNS
+    "timed out",
+    "an error happened while trying to locate the file on the hub",  # LocalEntryNotFoundError
+    "we cannot find the requested files",                            # LocalEntryNotFoundError
+)
+
+# The failure must also be Hugging-Face-shaped — the configured endpoint/host
+# named in the message, or HF-download wording — so a random socket error
+# (e.g. a local LLM provider being down) doesn't get the mirror hint just
+# because a mirror happens to be configured.
+_HF_CONTEXT_MARKERS = (
+    "huggingface",
+    "hf_hub",
+    "hf-hub",
+    "load the files",          # transformers
+    "cached files",            # transformers
+    "the requested files",     # LocalEntryNotFoundError
+    "locate the file on the hub",
+    "snapshot_download",
+)
+
+
+def configured_hf_mirror() -> str:
+    """The non-default Hugging Face endpoint (mirror) in effect, or "".
+
+    Same resolution the download paths use: ``HF_ENDPOINT`` env (what
+    Settings → Models → Hugging Face mirror persists via user_env, and what
+    the HF libraries read) with the ``hf_endpoint`` pref as fallback
+    (mirrors setup/download.py's ``prefs.resolve``). Never raises.
+    """
+    ep = (os.environ.get("HF_ENDPOINT") or "").strip()
+    if not ep:
+        try:
+            from core import prefs
+
+            ep = str(prefs.get("hf_endpoint", "") or "").strip()
+        except Exception:
+            ep = ""
+    ep = ep.rstrip("/")
+    if not ep or ep.lower() in _OFFICIAL_HF_ENDPOINTS:
+        return ""
+    return ep
+
+
+def hf_mirror_hint(reason: Optional[str]) -> str:
+    """Actionable hint when ``reason`` is an HF-download connectivity failure
+    and a non-default mirror endpoint is configured; "" otherwise.
+
+    The hint names the configured mirror, says it may be down, points at the
+    setting (Settings → Models → Hugging Face mirror), suggests the official
+    endpoint when the model isn't cached yet, and notes the restart
+    requirement (HF reads HF_ENDPOINT at import time — see the hf-mirror
+    endpoints in api/routers/settings.py). Never raises.
+    """
+    mirror = configured_hf_mirror()
+    if not mirror:
+        return ""
+    low = (reason or "").lower()
+    if not any(sig in low for sig in _HF_CONNECTIVITY_SIGNATURES):
+        return ""
+    try:
+        host = (urlsplit(mirror).netloc or "").lower()
+    except Exception:
+        host = ""
+    if not (
+        mirror.lower() in low
+        or (host and host in low)
+        or any(m in low for m in _HF_CONTEXT_MARKERS)
+    ):
+        return ""
+    return (
+        f"Your Hugging Face mirror is set to {mirror}, which couldn't be "
+        "reached — the mirror may be down or blocked on your network. If the "
+        'model isn\'t in your local cache yet, switch to "Hugging Face '
+        '(official)" in Settings → Models → Hugging Face mirror (or wait for '
+        "the mirror to recover), then restart OmniVoice — the mirror setting "
+        "is applied when the app starts."
+    )
+
+
+def append_hf_mirror_hint(text: str) -> str:
+    """``"{text} — {hint}"`` when the mirror-connectivity class applies;
+    ``text`` unchanged otherwise. For surfaces that hand a raw error string to
+    the UI (the global 500 handler, the model-install SSE). Never raises."""
+    try:
+        hint = hf_mirror_hint(text)
+    except Exception:
+        return text
+    return f"{text} — {hint}" if hint else text
+
+
+# Classes whose hint is safe to attach on the CONTEXT-FREE surfaces (the
+# global 500 handler in main.py, the model-install SSE in setup/download.py),
+# where all we have is a raw error string with no stage. Only classes whose
+# classify() trigger is unmistakable belong here — e.g. VIDEO_DOWNLOAD_NETWORK
+# must NOT be added: its bare "timed out" trigger would stamp a "video server"
+# hint on a model-load timeout that leaks through the 500 handler.
+_CONTEXT_FREE_HINT_CLASSES = frozenset({
+    "SOCKS_PROXY_SUPPORT_MISSING",
+    "SSL_HANDSHAKE_FAILURE",
+})
+
+
+def append_hint(text: str) -> str:
+    """``"{text} — {hint}"`` for raw-string surfaces (the global 500 handler,
+    the model-install SSE): the dynamic mirror hint (#874) when that class
+    applies, else a context-free static class hint (#959). ``text`` unchanged
+    otherwise — a no-op for every other error. Never raises."""
+    try:
+        hint = hf_mirror_hint(text)
+        if not hint:
+            topic = classify(text)
+            if topic in _CONTEXT_FREE_HINT_CLASSES:
+                hint = _HINTS.get(topic, "")
+    except Exception:
+        return text
+    return f"{text} — {hint}" if hint else text
+
+
 def classify(reason: str) -> str:
     """Map a failure reason to a docs-taxonomy key, or "" when unknown.
 
@@ -65,6 +218,19 @@ def classify(reason: str) -> str:
     # failure gets its hint rather than falling through to "".
     if "compute type" in low or "efficient float16" in low:
         return "COMPUTE_TYPE_UNSUPPORTED"
+    # #763: a bare OS-level EINVAL ("[Errno 22] Invalid argument") while writing
+    # the per-chunk temp WAV for transcription (tempfile.NamedTemporaryFile /
+    # soundfile.write on the system temp dir) used to collapse into a dead-end
+    # "produced no segments. [Errno 22] Invalid argument" toast with no next
+    # step. errno 22 is EINVAL on every platform; in this path it's almost always
+    # a temp dir that's missing, read-only, on a full/removed drive, or blocked
+    # by antivirus. Name the class so build_failure attaches an actionable hint
+    # instead of a raw errno. Matching the errno (not the generic "invalid
+    # argument" wording) keeps this from mislabelling unrelated failures; the
+    # transformers "errno 2" rule below is unaffected — it also requires the
+    # transformers + site-packages markers, which this signature lacks.
+    if "errno 22" in low:
+        return "OS_INVALID_ARGUMENT"
     if (
         "could not import module" in low
         or "autofeatureextractor" in low
@@ -84,10 +250,39 @@ def classify(reason: str) -> str:
         )
     ):
         return "TRANSFORMERS_IMPORT"
+    # #959: httpx raises ImportError AT CLIENT CONSTRUCTION ("Using SOCKS
+    # proxy, but the 'socksio' package is not installed. Make sure to install
+    # httpx using `pip install httpx[socks]`.") when ALL_PROXY/HTTPS_PROXY is
+    # socks5:// and socksio isn't importable. It surfaced from
+    # huggingface_hub's get_session() inside model load — a bare 500 on
+    # /generate with no next step. Checked BEFORE the HF-auth/mirror rules so
+    # a message that also carries HF wording still names this class.
+    if "socks proxy" in low or "socksio" in low:
+        return "SOCKS_PROXY_SUPPORT_MISSING"
+    # #976: a TLS handshake failing AFTER the TCP connection succeeds — the
+    # signature of a corporate/antivirus proxy that TLS-inspects traffic and
+    # re-signs certificates with a CA the OS trusts but Python's bundled
+    # certifi list doesn't (a different failure mode from #984's TCP-level
+    # "can't reach the host at all"). Requires "ssl" plus a handshake/cert-
+    # verify marker so a generic connection error isn't mislabelled.
+    if "ssl" in low and (
+        "handshake" in low
+        or "certificate verify failed" in low
+        or "sslv3_alert" in low
+        or "sslcertverificationerror" in low
+    ):
+        return "SSL_HANDSHAKE_FAILURE"
     if ("huggingface" in low or "hf_token" in low or "401" in low or "unauthorized" in low) and (
         "token" in low or "auth" in low or "401" in low or "unauthorized" in low
     ):
         return "HF_AUTH_FAILED"
+    # #874: a model download that failed because the CONFIGURED HF mirror is
+    # unreachable. Env-aware by design — the class only exists when a
+    # non-default HF_ENDPOINT is configured. Checked BEFORE the video-download
+    # network class so a model download's "timed out"/"connection reset"
+    # names the mirror instead of the "video server".
+    if hf_mirror_hint(reason):
+        return "HF_MIRROR_UNREACHABLE"
     # Video download (#554/#536): a non-downloadable URL shape vs a transient
     # network drop — both previously surfaced as a bare yt-dlp string with no
     # next step. UNSUPPORTED first (more specific) so "Unable to download video:
@@ -207,12 +402,15 @@ def build_failure(
 
     reason = sanitize(raw) or error_class
     docs_topic = classify(raw)
+    # HF_MIRROR_UNREACHABLE's hint is dynamic (it names the configured mirror)
+    # so it can't live in the static _HINTS table.
+    hint = hf_mirror_hint(raw) if docs_topic == "HF_MIRROR_UNREACHABLE" else _HINTS.get(docs_topic, "")
     fields: dict[str, Any] = {
         "reason": reason,
         "error": reason,  # backward-compat mirror for older frontends
         "error_class": error_class,
         "stage": stage,
-        "hint": _HINTS.get(docs_topic, ""),
+        "hint": hint,
         "docs_topic": docs_topic,
         "docs_url": error_docs_map.ERROR_DOCS.get(docs_topic, ""),
         "detail": sanitize(raw),

backend/core/scrub.py

@@ -134,3 +134,24 @@ def scrub_text(text: str | None) -> str:
             pass
 
     return s
+
+
+def scrub_provider_error(detail: object, api_key: str | None = None) -> str:
+    """UI-safe text for an LLM/translation provider failure.
+
+    Some OpenAI-compatible providers echo the caller's key or a stable
+    ``user_id`` back inside their error bodies, and a raw ``str(exc)`` on the
+    translate / glossary paths would surface that verbatim. This redacts the
+    exact resolved ``api_key`` first (in the provider-registry case it isn't a
+    shaped/known-env secret, so ``scrub_text`` alone can miss it) then runs the
+    generic secret + home-path scrub. Never raises — scrubbing must not mask a
+    failure with a new one. Mirrors ``settings._scrub_llm_detail`` so every
+    surface redacts identically.
+    """
+    s = str(detail if detail is not None else "")
+    try:
+        if api_key and api_key != "local" and len(api_key) >= _MIN_SECRET_LEN:
+            s = s.replace(api_key, REDACTED)
+    except Exception:
+        pass
+    return scrub_text(s)

backend/core/version.py

@@ -24,7 +24,7 @@ from pathlib import Path
 # tests/test_app_version.py::test_all_version_files_in_lockstep and bumped by
 # release.yml's version-bump job, so it stays equal to
 # pyproject/tauri.conf/Cargo/package.json.
-_FALLBACK_VERSION = "0.3.8"
+_FALLBACK_VERSION = "0.3.12"
 
 
 def _fallback_version() -> str:

backend/engines/supertonic3/backend.py

@@ -70,6 +70,7 @@ class Supertonic3Backend(SubprocessBackend):
     id = "supertonic3"
     display_name = "Supertonic-3 (31 langs, CPU ONNX, 7 preset voices, OpenRAIL-M)"
     supports_voice_design = False  # preset voices only
+    supports_cloning = False  # preset voices only; generate() never reads ref_audio
     # TTS-04: honest hardware reporting. Supertonic-3 has no CUDA / MPS
     # path in the SDK ‑‑ ONNX Runtime CPU EP only.
     gpu_compat: tuple[str, ...] = ("cpu",)

backend/main.py

@@ -139,6 +139,24 @@ os.environ.setdefault("HF_HUB_DISABLE_XET", "1")
 os.environ.setdefault("HF_HUB_ETAG_TIMEOUT", "15")
 os.environ.setdefault("HF_HUB_DOWNLOAD_TIMEOUT", "30")
 
+# ── OS trust store for TLS (#976) ───────────────────────────────────────────
+# Users behind a corporate/antivirus proxy that TLS-inspects HTTPS traffic get
+# a raw "[SSL: SSLV3_ALERT_HANDSHAKE_FAILURE] ssl/tls alert handshake failure"
+# on every model install — the TCP connection succeeds (a different failure
+# mode from #984's TCP-level blocked-host case), but the proxy re-signs the
+# certificate with its own root CA, which the OS trusts (Windows CryptoAPI/
+# SChannel) and Python's bundled `certifi` CA list does not. `inject_into_ssl`
+# patches `ssl.SSLContext` process-wide to verify against the OS trust store
+# instead, which is the actual fix (not just a nicer error message). Must run
+# here — at MODULE level, before huggingface_hub/requests/httpx do any network
+# I/O — not inside lifespan(), which runs too late. Not platform-gated: it's a
+# correctness improvement everywhere. Best-effort: never block startup.
+try:
+    import truststore
+
+    truststore.inject_into_ssl()
+except Exception:
+    pass
 
 # Prevent torchaudio from lazy-importing torchcodec (broken on some installs).
 # Proper fix = exclude torchcodec in pyproject.toml; this is a belt-and-braces guard.
@@ -155,6 +173,16 @@ from logging.handlers import RotatingFileHandler
 # written to prefs.json so they survive backend restarts. Read them back
 # here — before any user code reads os.environ — so the values are available
 # from startup.
+#
+# Legacy (≤v0.3.7) Translation-LLM rows (env.TRANSLATE_*) must migrate into
+# the custom LLM provider's settings store BEFORE the re-import below — once
+# TRANSLATE_BASE_URL lands in os.environ it hijacks the LLM provider
+# selection for the whole session (#963). Real env vars are untouched.
+try:
+    from services.llm_providers import migrate_legacy_translate_prefs
+    migrate_legacy_translate_prefs()
+except Exception:
+    pass  # never block startup on the migration; it retries next launch
 _PERSISTED_ENV_PREFIX = "env."
 try:
     from core.prefs import _load as _load_all_prefs
@@ -387,6 +415,32 @@ def _env_flag(name: str, default: bool = False) -> bool:
     return value.strip().lower() in {"1", "true", "yes", "on"}
 
 
+def _capture_preload_delay_s() -> float:
+    """Seconds after boot before the dictation (capture ASR) model warms.
+
+    Late enough that it never competes with startup I/O or the TTS preload;
+    overridable via OMNIVOICE_CAPTURE_PRELOAD_DELAY (mostly for tests)."""
+    raw = os.environ.get("OMNIVOICE_CAPTURE_PRELOAD_DELAY", "")
+    try:
+        v = float(raw)
+        if v >= 0:
+            return v
+    except (TypeError, ValueError):
+        pass
+    return 30.0
+
+
+def _capture_preload_ram_ok(min_free_bytes: int = 4 * 1024**3) -> bool:
+    """RAM guard for the dictation warm-up: skip below 4 GB free so the
+    background load never pushes a small machine into swap. If free memory
+    can't be measured, warm anyway (the load path has its own error handling)."""
+    try:
+        import psutil
+        return psutil.virtual_memory().available >= min_free_bytes
+    except Exception:
+        return True
+
+
 def _mcp_start_timeout_s() -> float:
     """Seconds to wait for the MCP session manager to start before giving up
     and serving without it (#632). Overridable via OMNIVOICE_MCP_START_TIMEOUT_S."""
@@ -519,11 +573,19 @@ async def lifespan(app: FastAPI):
     worker_task = asyncio.create_task(task_manager.worker())
     # Warm the TTS model in the background so first /generate is instant.
     preload_task = asyncio.create_task(preload_model())
-    # Capture ASR is useful to keep warm, but it is another large model in
-    # unified memory on Apple Silicon. Keep launch lean by default; users who
-    # prefer instant dictation can opt in with OMNIVOICE_PRELOAD_CAPTURE_ASR=1.
-    if _env_flag("OMNIVOICE_PRELOAD_CAPTURE_ASR"):
+    # Dictation v2: the capture ASR warms in the background BY DEFAULT — a
+    # deferred (~30s post-boot) load off the event loop, so startup stays
+    # lean and the first dictation is instant instead of a cold model load.
+    # OMNIVOICE_PRELOAD_CAPTURE_ASR=0 opts out; the warm-up is also skipped
+    # under 4 GB free RAM (checked at warm time, not boot time).
+    if _env_flag("OMNIVOICE_PRELOAD_CAPTURE_ASR", default=True):
         async def _preload_capture_asr():
+            await asyncio.sleep(_capture_preload_delay_s())
+            if not _capture_preload_ram_ok():
+                logger.info(
+                    "Capture ASR preload skipped: <4GB free RAM; "
+                    "dictation ASR will load on first use.")
+                return
             loading_detail = None
             prev_loading_detail = None
             try:
@@ -681,8 +743,17 @@ async def global_exception_handler(request: Request, exc: Exception):
         headers["Access-Control-Allow-Origin"] = origin
         headers["Access-Control-Allow-Credentials"] = "true"
         headers["Vary"] = "Origin"
+    # #874: a model download that failed because the CONFIGURED Hugging Face
+    # mirror (HF_ENDPOINT) is unreachable used to leak the raw transformers
+    # message ("We couldn't connect to 'https://hf-mirror.com' …") as the 500
+    # detail with no next step. #959: same story for the SOCKS-proxy class
+    # ("Using SOCKS proxy, but the 'socksio' package is not installed").
+    # Appending the shared hints HERE covers every route that can leak a
+    # model-load/download error (generate, dub, archetypes, …), not just TTS
+    # generate. append_hint is a no-op for every other error and never raises.
+    from core.failure import append_hint
     return JSONResponse(
-        {"detail": str(exc), "error_class": _entry.get("error_class")},
+        {"detail": append_hint(str(exc)), "error_class": _entry.get("error_class")},
         status_code=500,
         headers=headers,
     )

backend/migrations/env.py

@@ -17,7 +17,13 @@ from core.config import DB_PATH  # noqa: E402 — backend/ is on sys.path via al
 
 config = context.config
 if config.config_file_name is not None:
-    fileConfig(config.config_file_name)
+    # `disable_existing_loggers=False` is deliberate: this env runs *inside* the
+    # live app (startup `alembic upgrade head`), so the default (True) would
+    # disable every already-created application logger — e.g. silence
+    # `omnivoice.db.backup`'s "Skipping pre-migration DB backup" line and the
+    # rest of the app's logging for the remainder of the process. A migration
+    # must never mute the app (or leak that mute across a test session).
+    fileConfig(config.config_file_name, disable_existing_loggers=False)
 
 # SQLite file URL. Honour an externally-set URL (tests pass one via
 # `cfg.set_main_option("sqlalchemy.url", ...)` to point at a fixture DB),

backend/services/asr_backend.py

@@ -27,6 +27,7 @@ import asyncio
 import logging
 import os
 import re
+import threading
 from abc import ABC, abstractmethod
 
 logger = logging.getLogger("omnivoice.asr")
@@ -51,8 +52,95 @@ class ASRTimeoutError(TimeoutError):
     """
 
 
+def reset_pool_after_wedge(executor, *, what: str = "ASR") -> bool:
+    """Abandon a GPU pool whose worker is wedged on a timed-out transcribe (#730).
+
+    Python can't kill the stuck thread, but dropping the poisoned pool means the
+    next submit (a retry, the next chunk, or a concurrent TTS generate) gets a
+    fresh worker instead of queueing behind the wedged one. This is the ONE
+    recovery mechanism shared by every transcribe path — the whole-file guards
+    (via :func:`run_transcribe_guarded`) and the chunked dub stream both route
+    through it, so the semantics can't drift between them again.
+
+    Best-effort: an executor without ``reset()`` (a plain ThreadPoolExecutor in
+    tests) is a no-op, and a failing reset never raises — this runs on the very
+    failure path it's trying to recover from. Returns True when a reset ran.
+    """
+    _reset = getattr(executor, "reset", None)
+    if not callable(_reset):
+        return False
+    try:
+        _reset()
+        logger.warning(
+            "%s transcribe wedged — abandoned the GPU-pool worker to restore "
+            "capacity (#730).", what,
+        )
+        return True
+    except Exception:
+        logger.exception("GPU pool reset after %s timeout failed", what)
+        return False
+
+
+# ── Consecutive-timeout streak → recommend the crash-isolated engine ────────
+# A pool reset restores *capacity*, but the wedged CTranslate2/whisperx thread
+# keeps its VRAM until the process exits. When guarded transcribes keep timing
+# out back-to-back in one session, resets clearly aren't recovering the
+# underlying hang — the durable fix is the crash-isolated sidecar engine
+# (services.subprocess_asr, #393), whose child process CAN be hard-killed to
+# reclaim the hung call and its VRAM. We only *recommend* it (log + error
+# message); we never switch engines automatically (owner rule: no silent
+# behavior divergence).
+_TIMEOUT_STREAK_FOR_ISOLATED_HINT = 2
+_timeout_streak = 0
+_timeout_streak_lock = threading.Lock()
+
+
+def _note_transcribe_timeout() -> int:
+    global _timeout_streak
+    with _timeout_streak_lock:
+        _timeout_streak += 1
+        return _timeout_streak
+
+
+def _note_transcribe_success() -> None:
+    global _timeout_streak
+    with _timeout_streak_lock:
+        _timeout_streak = 0
+
+
+def _isolated_engine_hint(streak: int) -> str:
+    """User-facing recommendation once resets stop recovering (streak ≥ 2).
+
+    Empty when the streak is below the threshold, or when the user is already
+    on the isolated engine (recommending it to itself would be noise — the
+    base message's smaller-model/CPU guidance is all that's left)."""
+    if streak < _TIMEOUT_STREAK_FOR_ISOLATED_HINT:
+        return ""
+    try:
+        if active_backend_id() == "faster-whisper-isolated":
+            return ""
+    except Exception:  # noqa: BLE001 — the hint must never break the error path
+        pass
+    logger.warning(
+        "%d consecutive ASR transcribe timeouts this session — pool resets are "
+        "not recovering the hang. Recommend switching the ASR engine to "
+        "'Faster-Whisper (crash-isolated subprocess)' [faster-whisper-isolated] "
+        "in Settings → Engines. Not switching automatically (#730).", streak,
+    )
+    return (
+        f"This is {streak} transcribe timeouts in a row this session, so pool "
+        "resets aren't recovering the underlying hang. Recommended: switch the "
+        "ASR engine to 'Faster-Whisper (crash-isolated subprocess)' "
+        "(faster-whisper-isolated) in Settings → Engines — it runs "
+        "transcription in a separate process that can be force-killed to "
+        "reclaim a hung transcribe and its VRAM. OmniVoice never switches "
+        "engines automatically."
+    )
+
+
 async def run_transcribe_guarded(executor, fn, *, what: str = "ASR",
-                                 timeout: float = ASR_TRANSCRIBE_TIMEOUT_S):
+                                 timeout: float = ASR_TRANSCRIBE_TIMEOUT_S,
+                                 timeout_env: str = "OMNIVOICE_ASR_TRANSCRIBE_TIMEOUT_S"):
     """Run a blocking transcribe ``fn`` in ``executor`` with a hard wall-clock
     bound. On timeout, raise :class:`ASRTimeoutError` with guidance instead of
     letting the request hang forever.
@@ -73,30 +161,30 @@ async def run_transcribe_guarded(executor, fn, *, what: str = "ASR",
     loop = asyncio.get_running_loop()
     fut = loop.run_in_executor(executor, fn)
     try:
-        return await asyncio.wait_for(fut, timeout=timeout)
+        result = await asyncio.wait_for(fut, timeout=timeout)
     except asyncio.TimeoutError:
         # Free the poisoned pool so a hung transcribe can't keep starving TTS /
         # other ASR work (the "can't reach backend" symptom, #730).
-        _reset = getattr(executor, "reset", None)
-        if callable(_reset):
-            try:
-                _reset()
-                logger.warning(
-                    "%s transcription exceeded %.0fs — abandoned the GPU-pool "
-                    "worker to restore capacity (#730).", what, timeout,
-                )
-            except Exception:
-                logger.exception("GPU pool reset after ASR timeout failed")
-        raise ASRTimeoutError(
+        reset_pool_after_wedge(executor, what=what)
+        streak = _note_transcribe_timeout()
+        msg = (
             f"{what} transcription exceeded {timeout:.0f}s and was abandoned — "
             "the backend is running, but the ASR model is too heavy for the "
             "available compute. Most often the GPU is VRAM-starved: the resident "
             "TTS model and a large ASR model (large-v3) contend for memory. "
             "Capacity was restored automatically, but for a durable fix Flush the "
             "TTS model to free VRAM, pick a smaller ASR model in Settings → "
-            "Models, or set ASR to CPU. (Raise OMNIVOICE_ASR_TRANSCRIBE_TIMEOUT_S "
-            "for very long single files.)"
+            f"Models, or set ASR to CPU. (Raise {timeout_env} "
+            "for very long transcribes.)"
         )
+        hint = _isolated_engine_hint(streak)
+        if hint:
+            msg += " " + hint
+        raise ASRTimeoutError(msg)
+    # A completed transcribe (even a failed-but-returned one) proves the pool
+    # isn't hung — only genuine timeouts count toward the consecutive streak.
+    _note_transcribe_success()
+    return result
 
 
 def _compute_type_candidates(device: str) -> list[str]:
@@ -1336,6 +1424,11 @@ class SherpaDictationBackend(ASRBackend):
             )
         self._spec = spec
         self._rec = None  # lazy OfflineRecognizer / OnlineRecognizer
+        # One backend is shared across live-dictation WS sessions (see
+        # get_sherpa_dictation_backend), so guard the one-time recognizer build
+        # against two sessions racing to construct it concurrently. Each session
+        # still owns its own decode stream — only the recognizer is shared.
+        self._rec_lock = threading.Lock()
 
     @property
     def spec(self):
@@ -1353,14 +1446,25 @@ class SherpaDictationBackend(ASRBackend):
     def ensure_loaded(self) -> None:
         self._ensure_rec()
 
+    def warmup(self) -> None:
+        """Eagerly build the recognizer so the FIRST live-dictation session
+        doesn't pay the 1.3–2.5s ONNX-session load (#888 'instant first
+        dictation'). Called by the background capture-ASR preload; idempotent,
+        and the built recognizer is reused across sessions via
+        get_sherpa_dictation_backend (the same singleton the preload warms)."""
+        self._ensure_rec()
+
     def _ensure_rec(self):
         if self._rec is not None:
             return
-        from services import sherpa_dictation as _sd
-        if self._spec.streaming:
-            self._rec = _sd.build_online_recognizer(self._spec)
-        else:
-            self._rec = _sd.build_offline_recognizer(self._spec)
+        with self._rec_lock:
+            if self._rec is not None:
+                return
+            from services import sherpa_dictation as _sd
+            if self._spec.streaming:
+                self._rec = _sd.build_online_recognizer(self._spec)
+            else:
+                self._rec = _sd.build_offline_recognizer(self._spec)
 
     def transcribe(self, audio_path: str, *, word_timestamps: bool = True) -> dict:
         self._ensure_rec()
@@ -1558,7 +1662,13 @@ class _LazyASRRegistry(dict):
 
     def __iter__(self):
         seen = set()
-        for k in dict.__iter__(self):
+        # Snapshot the live keys before yielding — see _LazyRegistry.__iter__ in
+        # tts_backend.py. A concurrent lazy __getitem__ inserts into self, and
+        # list_backends() runs in a FastAPI threadpool, so a *live* dict iterator
+        # held open across the per-engine is_available() probes would raise
+        # "dictionary changed size during iteration". list() consumes it
+        # atomically under the GIL, closing the window.
+        for k in list(dict.__iter__(self)):
             seen.add(k)
             yield k
         for k in self._LAZY:
@@ -1590,10 +1700,25 @@ _INSTALL_HINTS: dict[str, str] = {
     "faster-whisper":  "pip install faster-whisper  (CTranslate2; cross-platform, CUDA or CPU)",
     "mlx-whisper":     "pip install mlx-whisper  (Apple Silicon only)",
     "pytorch-whisper": "Bundled with transformers — no extra install (CUDA/MPS/CPU)",
-    "nemo-parakeet":   "pip install nemo_toolkit[asr]  (NVIDIA Parakeet; CUDA or CPU)",
+    "nemo-parakeet":   (
+        "No safe install path in this app yet — nemo_toolkit's ASR extras pin "
+        "transformers>=4.57,<4.58, which conflicts with OmniVoice's own "
+        "transformers>=5.3 requirement and WILL break the backend "
+        "(ImportError on startup) if installed into this shared venv. Do NOT "
+        "install nemo_toolkit here. If you want to try Parakeet TDT, set it "
+        "up in a separate/dedicated Python environment — not the one "
+        "OmniVoice manages; in-app isolation for this engine is tracked "
+        "separately."
+    ),
     "moonshine":       "pip install useful-moonshine  (edge/CPU-optimized ASR)",
     "funasr":          "pip install funasr  (SenseVoiceSmall + FSMN-VAD; CUDA or CPU)",
     "sherpa-onnx-asr": "uv add sherpa-onnx  (ONNX live dictation; CPU, cross-platform)",
+    "faster-whisper-isolated": (
+        "No extra install (reuses faster-whisper). Escape hatch for hanging "
+        "transcribes: runs ASR in a separate process that can be force-killed "
+        "to reclaim a hung transcribe and its VRAM (#730). Slightly slower per "
+        "call than in-process faster-whisper."
+    ),
 }
 
 # Most-recent failure per backend, so a transient probe error survives between
@@ -1707,6 +1832,14 @@ def active_backend_id() -> str:
     return _auto_detect()
 
 
+# Subprocess-isolated backends must be process-wide singletons: their
+# ``__init__`` registers an atexit shutdown hook and the instance owns the
+# sidecar child process, so a fresh instance per request would leak handler
+# entries and respawn the sidecar (reloading its model) on every transcribe.
+# Same rationale as api.routers.engines._ENGINE_INSTANCES.
+_ISOLATED_INSTANCES: dict[str, "ASRBackend"] = {}
+
+
 def get_active_asr_backend(*, asr_pipe=None) -> ASRBackend:
     bid = active_backend_id()
     if bid == "pytorch-whisper":
@@ -1719,7 +1852,14 @@ def get_active_asr_backend(*, asr_pipe=None) -> ASRBackend:
         return WhisperXBackend()
     if bid not in _REGISTRY:
         raise ValueError(f"Unknown ASR backend: {bid!r}. Known: {list(_REGISTRY)}")
-    return _REGISTRY[bid]()
+    cls = _REGISTRY[bid]
+    if getattr(cls, "_is_subprocess_isolated", False):
+        inst = _ISOLATED_INSTANCES.get(bid)
+        if inst is None:
+            inst = cls()
+            _ISOLATED_INSTANCES[bid] = inst
+        return inst
+    return cls()
 
 
 def transcribe_reference(audio_path: str) -> str | None:
@@ -1764,6 +1904,34 @@ _capture_backend: ASRBackend | None = None
 # The sherpa model id the cached capture backend was built for, so a model
 # switch in Settings rebuilds the singleton instead of serving the old model.
 _capture_backend_key: str | None = None
+# Guards the read-modify-write of the two globals above. Both the background
+# capture-ASR preload (runs in the GPU-pool thread) and the live-dictation WS
+# handlers (run on the event loop) resolve/replace the singleton, so the
+# check-then-build must be atomic to avoid two threads each building a model.
+_capture_backend_lock = threading.Lock()
+
+
+def get_sherpa_dictation_backend(model_id: str) -> "SherpaDictationBackend":
+    """Return a shared, warm-cached :class:`SherpaDictationBackend` for
+    ``model_id``, building it at most once and reusing the recognizer across
+    live-dictation WS sessions.
+
+    Live sessions previously constructed a FRESH backend per WebSocket connect,
+    so every session reloaded the ONNX recognizer (1.3–2.5s "loading…") and the
+    #888 background preload was a no-op. This reuses the SAME module-level
+    ``_capture_backend`` singleton the preload warms (when the ids match), and
+    rebuilds on a model switch — identical invalidation to
+    :func:`get_capture_asr_backend`. Thread-safe: the recognizer is shared;
+    each session creates its own decode stream (see capture_ws)."""
+    global _capture_backend, _capture_backend_key
+    with _capture_backend_lock:
+        if (isinstance(_capture_backend, SherpaDictationBackend)
+                and _capture_backend_key == model_id):
+            return _capture_backend
+        backend = SherpaDictationBackend(model_id=model_id)
+        _capture_backend = backend
+        _capture_backend_key = model_id
+        return backend
 
 
 def dictation_model_id() -> str | None:
@@ -1803,49 +1971,52 @@ def get_capture_asr_backend() -> ASRBackend:
     """
     global _capture_backend, _capture_backend_key
 
-    # 0. Honor an explicit sherpa dictation model selection.
-    sherpa_id = dictation_model_id()
-    if sherpa_id:
-        ok, _ = SherpaDictationBackend.is_available()
+    # Atomic resolve+build so the preload thread and a WS session (which may
+    # call get_sherpa_dictation_backend concurrently) can't both build a model.
+    with _capture_backend_lock:
+        # 0. Honor an explicit sherpa dictation model selection.
+        sherpa_id = dictation_model_id()
+        if sherpa_id:
+            ok, _ = SherpaDictationBackend.is_available()
+            if ok:
+                if not (isinstance(_capture_backend, SherpaDictationBackend)
+                        and _capture_backend_key == sherpa_id):
+                    try:
+                        _capture_backend = SherpaDictationBackend(model_id=sherpa_id)
+                        _capture_backend_key = sherpa_id
+                    except Exception as e:  # noqa: BLE001 — fall through to Whisper
+                        logger.warning(
+                            "sherpa dictation model %r unavailable (%s) — falling "
+                            "back to Whisper capture engine", sherpa_id, e,
+                        )
+                        _capture_backend = None
+                        _capture_backend_key = None
+                if _capture_backend is not None:
+                    return _capture_backend
+            else:
+                logger.info(
+                    "dictation.model_id=%r selected but sherpa-onnx not installed — "
+                    "falling back to Whisper capture engine", sherpa_id,
+                )
+
+        if _capture_backend is not None and _capture_backend_key is None:
+            return _capture_backend
+
+        # Prefer MLX Turbo on Apple Silicon
+        ok, _ = MLXWhisperBackend.is_available()
         if ok:
-            if not (isinstance(_capture_backend, SherpaDictationBackend)
-                    and _capture_backend_key == sherpa_id):
-                try:
-                    _capture_backend = SherpaDictationBackend(model_id=sherpa_id)
-                    _capture_backend_key = sherpa_id
-                except Exception as e:  # noqa: BLE001 — fall through to Whisper
-                    logger.warning(
-                        "sherpa dictation model %r unavailable (%s) — falling "
-                        "back to Whisper capture engine", sherpa_id, e,
-                    )
-                    _capture_backend = None
-                    _capture_backend_key = None
-            if _capture_backend is not None:
-                return _capture_backend
-        else:
-            logger.info(
-                "dictation.model_id=%r selected but sherpa-onnx not installed — "
-                "falling back to Whisper capture engine", sherpa_id,
-            )
+            _capture_backend = MLXWhisperBackend(model_name=_MLX_MODEL_TURBO)
+            _capture_backend_key = None
+            return _capture_backend
 
-    if _capture_backend is not None and _capture_backend_key is None:
-        return _capture_backend
+        # Fall back to faster-whisper (CPU int8 on non-Apple)
+        ok, _ = FasterWhisperBackend.is_available()
+        if ok:
+            _capture_backend = FasterWhisperBackend()
+            _capture_backend_key = None
+            return _capture_backend
 
-    # Prefer MLX Turbo on Apple Silicon
-    ok, _ = MLXWhisperBackend.is_available()
-    if ok:
-        _capture_backend = MLXWhisperBackend(model_name=_MLX_MODEL_TURBO)
+        # Last resort
+        _capture_backend = PyTorchWhisperBackend()
         _capture_backend_key = None
         return _capture_backend
-
-    # Fall back to faster-whisper (CPU int8 on non-Apple)
-    ok, _ = FasterWhisperBackend.is_available()
-    if ok:
-        _capture_backend = FasterWhisperBackend()
-        _capture_backend_key = None
-        return _capture_backend
-
-    # Last resort
-    _capture_backend = PyTorchWhisperBackend()
-    _capture_backend_key = None
-    return _capture_backend

backend/services/audio_dsp.py

@@ -1,9 +1,12 @@
 """
 Audio DSP pipeline — broadcast-grade mastering + configurable effects chain.
 
-The default `apply_mastering()` is the same chain shipped since v0.1.0
-(highpass + compressor + light reverb). The new `apply_effects_chain()`
-lets callers build custom pipelines from a list of named effects.
+`apply_mastering()` is the shared pre-stage that runs before the user's
+effect preset: highpass + gentle compression only (see `MASTERING_CHAIN`).
+Reverb is deliberately NOT part of it — it is preset-declared only (e.g.
+cinematic, warm); a hidden reverb here used to bake echo into every non-raw
+synthesis, which field reports flagged. `apply_effects_chain()` lets callers
+build custom pipelines from a list of named effects.
 
 All effects use Spotify's `pedalboard` library. When pedalboard isn't
 installed, every function degrades gracefully (returns audio unmodified).
@@ -97,24 +100,26 @@ def get_effect_chain(preset_id: str) -> list[dict]:
 
 # ── Core DSP functions ──────────────────────────────────────────────────
 
+#: Shared pre-preset mastering stage: highpass + gentle compression ONLY.
+#: Reverb must never live here — a hidden Reverb in this chain baked echo
+#: into every non-raw synthesis regardless of the chosen preset (field
+#: reports of echoey voices; the podcast preset even promises "no reverb").
+#: Reverb is preset-declared only (see EFFECT_PRESETS: cinematic, warm).
+MASTERING_CHAIN = [
+    {"type": "highpass", "cutoff_hz": 60},
+    {"type": "compressor", "threshold_db": -15, "ratio": 1.5, "attack_ms": 2.0, "release_ms": 100},
+]
+
 
 def apply_mastering(audio_tensor, sample_rate=24000):
-    """Applies professional Broadcast-grade DSP (EQ, Compressor, light Reverb) to the clone voice."""
+    """Applies the broadcast pre-stage (highpass + gentle compression) to the clone voice.
+
+    Reverb is intentionally absent — only user-chosen effect presets declare
+    it. Degrades gracefully: pedalboard missing or any DSP error returns the
+    input unmodified.
+    """
     try:
-        from pedalboard import Pedalboard, Compressor, Reverb, HighpassFilter
-        import numpy as np
-        board = Pedalboard([
-            HighpassFilter(cutoff_frequency_hz=60),
-            Compressor(threshold_db=-15, ratio=1.5, attack_ms=2.0, release_ms=100),
-            Reverb(room_size=0.10, wet_level=0.08, dry_level=0.95)
-        ])
-        audio_np = audio_tensor.cpu().numpy()
-        if audio_np.ndim == 1:
-            audio_np = audio_np[np.newaxis, :]
-        effected = board(audio_np, sample_rate, reset=False)
-        return torch.from_numpy(effected).to(audio_tensor.device)
-    except ImportError:
-        return audio_tensor # Fail gracefully if pedalboard isn't installed
+        return apply_effects_chain(audio_tensor, sample_rate, MASTERING_CHAIN)
     except Exception as e:
         logger.warning("Mastering DSP Error: %s", e)
         return audio_tensor

backend/services/audiobook.py

@@ -104,9 +104,10 @@ def synthesize_chapter(
 ):
     """Render a chapter's spans to one waveform via an injected ``synth``.
 
-    ``synth(text, voice_id, speed)`` returns a 1-D float32 audio tensor for a
-    span of text in the given voice (``speed`` may be ``None`` for the engine
-    default). Long spans are split with the ``chunked_tts`` splitter and
+    ``synth(text, voice_id, speed)`` returns a float32 audio tensor — 1-D
+    ``(samples,)`` or ``(channels, samples)``; real engines emit ``(1, samples)``
+    per the ``TTSBackend`` contract (#897) — for a span of text in the given
+    voice (``speed`` may be ``None`` for the engine default). Long spans are split with the ``chunked_tts`` splitter and
     crossfaded; inter-span ``pause_ms_after`` becomes silence. ``lexicon`` (when
     given) respells each span's text before chunking so the engine pronounces
     tricky words correctly; a ``None``/empty lexicon is a no-op pass-through.
@@ -118,23 +119,35 @@ def synthesize_chapter(
     from services.chunked_tts import concatenate_audio_chunks, split_text_into_chunks
     from services.pronunciation import apply_lexicon
 
-    parts: list = []
+    items: list = []  # ("a", tensor) for audio, ("s", n_samples) for silence
     for span in spans:
         if span.text:
             chunks = split_text_into_chunks(apply_lexicon(span.text, lexicon))
             rendered = [synth(c, span.voice_id, span.speed) for c in chunks]
             rendered = [r for r in rendered if r is not None and getattr(r, "numel", lambda: 0)()]
             if len(rendered) == 1:
-                parts.append(rendered[0])
+                items.append(("a", rendered[0]))
             elif rendered:
-                parts.append(concatenate_audio_chunks(rendered, sample_rate, crossfade_ms=crossfade_ms))
+                items.append(("a", concatenate_audio_chunks(rendered, sample_rate, crossfade_ms=crossfade_ms)))
         if span.pause_ms_after > 0:
             n = int(sample_rate * span.pause_ms_after / 1000.0)
             if n > 0:
-                parts.append(torch.zeros(n, dtype=torch.float32))
+                items.append(("s", n))
 
-    if not parts:
+    if not items:
         return torch.zeros(0, dtype=torch.float32), 0.0
+    # Engines return (1, samples) per the TTSBackend contract while a bare
+    # zeros(n) is 1-D — mixing the two crashed the final concat (#897). So
+    # materialize inter-span silence AFTER the loop, matching the rendered
+    # audio's channel dims / dtype / device (same pattern as generation.py's
+    # _render_with_pauses). A silence-only chapter stays 1-D float32 as before.
+    ref = next((t for kind, t in items if kind == "a"), None)
+    parts: list = [
+        val if kind == "a"
+        else (torch.zeros(val, dtype=torch.float32) if ref is None
+              else torch.zeros(*ref.shape[:-1], val, dtype=ref.dtype, device=ref.device))
+        for kind, val in items
+    ]
     # Hard-concat spans + silences (crossfading silence would bleed the gap).
     audio = parts[0] if len(parts) == 1 else concatenate_audio_chunks(parts, sample_rate, crossfade_ms=0)
     return audio, audio.shape[-1] / float(sample_rate)

backend/services/chunked_tts.py

@@ -183,14 +183,43 @@ def _safe_hard_cut(segment: str, max_chars: int) -> int:
     return cut
 
 
+def _normalize_chunk_shapes(chunks: list) -> list:
+    """Coerce mixed-rank / mixed-channel chunks to one concat-compatible shape.
+
+    Engines return ``(1, samples)`` per the ``TTSBackend.generate`` contract,
+    but silence buffers and some model paths hand over bare ``(samples,)``
+    tensors — ``torch.cat`` then dies with "Tensors must have same number of
+    dimensions" (#897). Promote lower-rank chunks with leading singleton dims
+    to the highest rank present, then broadcast singleton channel dims up to
+    the widest channel count (mono follows stereo). Rank-homogeneous,
+    channel-homogeneous input is returned untouched, so all-1-D / all-2-D
+    callers keep their exact output shape; a genuine channel conflict
+    (e.g. 2 vs 3 channels) still raises, which is the honest outcome.
+    """
+    target = max(c.dim() for c in chunks)
+    if any(c.dim() != target for c in chunks):
+        promoted = []
+        for c in chunks:
+            while c.dim() < target:
+                c = c.unsqueeze(0)
+            promoted.append(c)
+        chunks = promoted
+    if target > 1:
+        lead = tuple(max(c.shape[i] for c in chunks) for i in range(target - 1))
+        chunks = [c if tuple(c.shape[:-1]) == lead else c.expand(*lead, -1)
+                  for c in chunks]
+    return chunks
+
+
 def concatenate_audio_chunks(chunks: list, sample_rate: int,
                              crossfade_ms: int = DEFAULT_CROSSFADE_MS):
     """Join per-chunk waveforms with a linear crossfade on the sample axis.
 
     ``chunks`` are torch tensors as returned by the engine (1-D, or N-D with
     samples on the last axis — matching what ``_render_with_pauses`` handles).
-    Crossfade overlap is clamped to the shorter neighbor; ``crossfade_ms=0``
-    is a hard concat.
+    Mixed ranks / mono-vs-multichannel chunks are normalized to one shape
+    first (#897), so no producer can crash the concat. Crossfade overlap is
+    clamped to the shorter neighbor; ``crossfade_ms=0`` is a hard concat.
     """
     import torch
 
@@ -199,6 +228,7 @@ def concatenate_audio_chunks(chunks: list, sample_rate: int,
         return torch.zeros(1, dtype=torch.float32)
     if len(chunks) == 1:
         return chunks[0]
+    chunks = _normalize_chunk_shapes(chunks)
 
     crossfade_samples = int(sample_rate * crossfade_ms / 1000)
     result = chunks[0]

backend/services/director.py

@@ -26,6 +26,10 @@ from services.llm_backend import get_active_llm_backend, OffBackend
 
 logger = logging.getLogger("omnivoice.director")
 
+# LLM Skills registry id — Settings → LLM Skills can disable the LLM parse
+# or route it to a specific provider. Disabled == the heuristic parser.
+_SKILL_ID = "direction_parse"
+
 
 # ── Taxonomy (stable contract) ──────────────────────────────────────────────
 # Additive per dimension — multiple values allowed. Unknown tokens are ignored
@@ -147,7 +151,10 @@ def parse(text: str) -> Direction:
     if not text or not text.strip():
         return Direction(source=text or "")
 
-    llm = get_active_llm_backend()
+    from services import llm_skills
+    # `active=` forwards this module's (monkeypatch-able) name so the
+    # no-override path is byte-identical to the pre-skills behavior.
+    llm = llm_skills.skill_backend(_SKILL_ID, active=lambda: get_active_llm_backend())
     if isinstance(llm, OffBackend):
         return _heuristic_parse(text)
 

backend/services/dub_pipeline.py

@@ -187,6 +187,14 @@ def put_job(job_id: str, job: dict) -> None:
 def save_job(job_id: str, job: dict, filename: str = "", duration: float = 0.0, content_hash: str = "") -> None:
     """Persist dub job state to SQLite so it survives restarts. Uses UPSERT
     on `id` so repeated saves in a session keep the latest snapshot.
+
+    language / language_code / content_hash only update when the incoming
+    value is non-empty: the ingest-time insert runs before the target
+    language is known (both columns ""), generation sets them on the job
+    dict, and a later save from a job that lost them (e.g. hydrated from an
+    old row) must not clobber the healed columns back to "". The frontend
+    keys history restore off language_code, so a frozen "" hid finished
+    tracks until the user re-picked a language.
     """
     try:
         segments = job.get("segments") or []
@@ -200,6 +208,8 @@ def save_job(job_id: str, job: dict, filename: str = "", duration: float = 0.0,
                      filename=excluded.filename,
                      duration=excluded.duration,
                      segments_count=excluded.segments_count,
+                     language=CASE WHEN excluded.language != '' THEN excluded.language ELSE dub_history.language END,
+                     language_code=CASE WHEN excluded.language_code != '' THEN excluded.language_code ELSE dub_history.language_code END,
                      tracks=excluded.tracks,
                      job_data=excluded.job_data,
                      content_hash=CASE WHEN excluded.content_hash != '' THEN excluded.content_hash ELSE dub_history.content_hash END""",

backend/services/engine_routing.py

@@ -63,7 +63,21 @@ def resolve_routing(gpu_compat: tuple[str, ...], caps: HostCaps) -> RoutingResul
             "routing_reason": _caveat(caps),
         }
 
-    # 3. Host has an accelerator the engine lacks, but engine supports cpu
+    # 3. CPU-native engine (declares ONLY cpu) has nothing to fall back FROM,
+    #    so on ANY accelerator host it is benign cpu_only (neutral), never a
+    #    warn-tone "CPU fallback". This must precede the fallback rule below —
+    #    a ("cpu",) engine matches `"cpu" in targets` too, and would otherwise
+    #    be mis-classed cpu_fallback on a GPU/MPS host. (A cpu host reaches
+    #    rule 5 unchanged, keeping its DirectML note.) Engines that *could*
+    #    accelerate elsewhere (e.g. ("cuda", "cpu")) are untouched.
+    if fam != "cpu" and targets == ("cpu",):
+        return {
+            "effective_device": "cpu",
+            "routing_status": "cpu_only",
+            "routing_reason": None,
+        }
+
+    # 4. Host has an accelerator the engine lacks, but engine supports cpu
     #    → the no-silent-fallback signal.
     if fam != "cpu" and "cpu" in targets:
         if fam == "rocm" and "cuda" in targets and "rocm" not in targets:
@@ -76,7 +90,7 @@ def resolve_routing(gpu_compat: tuple[str, ...], caps: HostCaps) -> RoutingResul
             "routing_reason": reason,
         }
 
-    # 4. Genuine CPU-only host (or DirectML, which the probe reports as cpu)
+    # 5. Genuine CPU-only host (or DirectML, which the probe reports as cpu)
     #    and engine supports cpu → benign; must not warn or block.
     if fam == "cpu" and "cpu" in targets:
         reason = None
@@ -93,7 +107,7 @@ def resolve_routing(gpu_compat: tuple[str, ...], caps: HostCaps) -> RoutingResul
             "routing_reason": reason,
         }
 
-    # 5. Engine needs an accelerator this host lacks and has no cpu path.
+    # 6. Engine needs an accelerator this host lacks and has no cpu path.
     first = targets[0]
     return {
         "effective_device": first,

backend/services/incremental.py

@@ -49,7 +49,7 @@ def _canon_value(field: str, value):
     return value
 
 
-def segment_fingerprint(seg: dict) -> str:
+def segment_fingerprint(seg: dict, track_lang: str | None = None) -> str:
     """Deterministic hash of the inputs that actually affect TTS output.
 
     Any change to `_GEN_INPUT_FIELDS` flips the hash and the segment becomes
@@ -61,8 +61,20 @@ def segment_fingerprint(seg: dict) -> str:
     so a fingerprint computed from the generate request (server defaults
     filled in) matches one recomputed later from the client's raw segment
     state — the root cause of #281's "1 edit re-dubs all N lines".
+
+    ``track_lang`` (P1.3) is the TRACK's language code (`req.language_code`,
+    e.g. "es"). It is part of the fingerprint because the same segment text
+    renders different audio per language — without it, a bn hash could
+    vouch for an es WAV on a multi-track job. It is only mixed in when
+    provided, so hashes computed by legacy callers (and hashes stored by
+    previous builds, which never carried a language) keep their old values;
+    a legacy hash therefore never matches a lang-scoped fingerprint and the
+    segment reads as stale — the safe direction (one clean regen, never a
+    wrong-language splice).
     """
     payload = {k: _canon_value(k, seg.get(k)) for k in _GEN_INPUT_FIELDS}
+    if track_lang:
+        payload["track_lang"] = str(track_lang)
     blob = json.dumps(payload, sort_keys=True, ensure_ascii=False)
     return hashlib.sha1(blob.encode("utf-8"), usedforsecurity=False).hexdigest()[:16]
 
@@ -120,6 +132,7 @@ def plan_incremental(
     segments: list[dict],
     *,
     stored_hashes: dict[str, str] | None = None,
+    track_lang: str | None = None,
 ) -> dict:
     """Return `{stale, fresh, total, fingerprints}` where:
 
@@ -133,6 +146,13 @@ def plan_incremental(
     `stored_hashes` may come from the caller's own bookkeeping (e.g. the
     `dub_history.job_data["seg_hashes"]` we'll start writing in Phase 4.5).
     When missing, every segment is considered stale (first run).
+
+    `track_lang` (P1.3) scopes the plan to ONE dub track: pass the track's
+    language code together with THAT language's stored hashes
+    (`job_data["seg_hashes_by_lang"][lang]`) so staleness is judged against
+    the active track, never against whatever language was generated last.
+    Must match the language the generate run hashed with, or every segment
+    reads stale (#281 parity class).
     """
     stored = stored_hashes or {}
     stale: list[str] = []
@@ -142,7 +162,7 @@ def plan_incremental(
         sid = str(seg.get("id", ""))
         if not sid:
             continue
-        fp = segment_fingerprint(seg)
+        fp = segment_fingerprint(seg, track_lang=track_lang)
         fingerprints[sid] = fp
         prev = stored.get(sid)
         if prev == fp:

backend/services/llm_backend.py

@@ -54,9 +54,12 @@ class LLMBackend(ABC):
     def model_name(self) -> str: ...
 
     @abstractmethod
-    def chat(self, *, system: str, user: str, timeout: Optional[float] = None) -> str:
+    def chat(self, *, system: str, user: str, timeout: Optional[float] = None,
+             temperature: Optional[float] = None) -> str:
         """One-shot chat completion. Returns the assistant content string.
         Raises on failure — callers decide whether to fallback gracefully.
+        ``temperature`` is only sent to the provider when set — callers that
+        leave it None keep the provider default (existing behavior).
         """
 
 
@@ -67,8 +70,18 @@ class OpenAICompatBackend(LLMBackend):
     id = "openai-compat"
     display_name = "OpenAI-compatible (real OpenAI, Ollama, LM Studio, …)"
 
-    def __init__(self):
+    def __init__(self, provider=None):
+        """``provider``: optional ``llm_providers.Provider`` to bind this
+        instance to (LLM Skills per-skill routing). None keeps the historical
+        behavior — resolve the ACTIVE provider at call time."""
         self._client = None
+        self._provider = provider
+
+    def _resolve_provider(self):
+        if self._provider is not None:
+            return self._provider
+        from services import llm_providers
+        return llm_providers.active_provider()
 
     @classmethod
     def is_available(cls) -> tuple[bool, str]:
@@ -97,7 +110,7 @@ class OpenAICompatBackend(LLMBackend):
     @property
     def model_name(self) -> str:
         from services import llm_providers
-        p = llm_providers.active_provider()
+        p = self._resolve_provider()
         if p is not None:
             return llm_providers.resolve_model(p)
         return os.environ.get("TRANSLATE_MODEL", "gpt-4o-mini")
@@ -107,7 +120,7 @@ class OpenAICompatBackend(LLMBackend):
             return self._client
         from openai import OpenAI
         from services import llm_providers
-        p = llm_providers.active_provider()
+        p = self._resolve_provider()
         if p is None:
             raise RuntimeError("LLM not configured. See `is_available()` for the hint.")
         base_url = llm_providers.resolve_base_url(p)
@@ -117,35 +130,48 @@ class OpenAICompatBackend(LLMBackend):
         kw = {"api_key": api_key}
         if base_url:
             kw["base_url"] = base_url
-        self._client = OpenAI(**kw)
+        # max_retries=0 so a 429 + Retry-After can't make one chat() sleep
+        # through the Autofit fit-pass wall-clock budget (speech_rate).
+        self._client = OpenAI(max_retries=0, **kw)
         return self._client
 
-    def chat(self, *, system: str, user: str, timeout: Optional[float] = None) -> str:
+    def chat(self, *, system: str, user: str, timeout: Optional[float] = None,
+             temperature: Optional[float] = None) -> str:
         return self.chat_messages(
             messages=[
                 {"role": "system", "content": system},
                 {"role": "user", "content": user},
             ],
             timeout=timeout,
+            temperature=temperature,
         )
 
-    def chat_messages(self, *, messages: list[dict], timeout: Optional[float] = None) -> str:
+    def chat_messages(self, *, messages: list[dict], timeout: Optional[float] = None,
+                      temperature: Optional[float] = None) -> str:
         """One-shot completion over a full message list.
 
         Additive surface for callers that need structured few-shot turns
         (dictation refinement, Wave 2.1) — small local models pattern-match
         and echo inline examples, so examples must arrive as prior chat
         turns, not inside the system prompt.
+
+        ``temperature`` is only forwarded when set (Cinematic/Autofit pin 0.2
+        — the provider default of 1.0 makes local models drift and invent);
+        every other caller leaves it None and keeps the provider default.
         """
         if timeout is None:
             try:
                 timeout = float(os.environ.get("OMNIVOICE_LLM_TIMEOUT", "45"))
             except ValueError:
                 timeout = 45.0
+        kw = {}
+        if temperature is not None:
+            kw["temperature"] = temperature
         res = self._get_client().chat.completions.create(
             model=self.model_name,
             timeout=timeout,
             messages=messages,
+            **kw,
         )
         return (res.choices[0].message.content or "").strip()
 

backend/services/llm_providers.py

@@ -24,10 +24,13 @@ users.
 """
 from __future__ import annotations
 
+import logging
 import os
 from dataclasses import dataclass
 from typing import Optional
 
+logger = logging.getLogger("omnivoice.llm_providers")
+
 # Settings-store row names (non-secret overrides live in the plaintext table;
 # keys live in the encrypted secret table under ``llm_key.<id>``).
 _ACTIVE_PROVIDER_KEY = "llm.active_provider"
@@ -172,17 +175,33 @@ def _env_first(names: tuple[str, ...]) -> Optional[str]:
     return None
 
 
-def resolve_base_url(p: Provider) -> str:
+def resolve_account_id(p: Provider) -> str:
+    """The Cloudflare-style account id: env override → stored → empty."""
+    from services import settings_store
+    return (
+        (p.account_env and os.environ.get(p.account_env))
+        or settings_store.get_text(f"llm.account.{p.id}")
+        or ""
+    )
+
+
+def resolve_base_url(p: Provider, *, substitute: bool = True) -> str:
+    """Resolve a provider's base URL (env → stored override → default).
+
+    ``substitute`` interpolates ``{account_id}`` for account-scoped providers
+    (Cloudflare) so the *client* gets a working URL. The UI passes
+    ``substitute=False`` so the field shows/saves the raw template — baking the
+    substituted value back into a stored override would freeze the URL and make
+    later account-id changes silently no-op (the bug this guards against).
+    """
     from services import settings_store
     val = (
         (p.base_url_env and os.environ.get(p.base_url_env))
         or settings_store.get_text(_BASE_URL_KEY + p.id)
         or p.default_base_url
     )
-    if p.needs_account and val and "{account_id}" in val:
-        acct = (p.account_env and os.environ.get(p.account_env)) or \
-            settings_store.get_text(f"llm.account.{p.id}") or ""
-        val = val.replace("{account_id}", acct)
+    if substitute and p.needs_account and val and "{account_id}" in val:
+        val = val.replace("{account_id}", resolve_account_id(p))
     return val or ""
 
 
@@ -232,6 +251,19 @@ def is_configured(p: Provider) -> bool:
 
 # ── Active provider selection ─────────────────────────────────────────────
 
+def stored_active_provider_id() -> Optional[str]:
+    """The user's explicitly-persisted selection ONLY — no env pin, no legacy
+    TRANSLATE_* fallback, no auto-detect.
+
+    ``None`` means the user has never chosen a provider. This is what gates
+    save-activates in the settings router (#963): an explicit save may claim
+    the *empty* slot, but must never steal it from a made choice.
+    """
+    from services import settings_store
+    stored = settings_store.get_text(_ACTIVE_PROVIDER_KEY)
+    return stored if stored and stored in _BY_ID else None
+
+
 def active_provider_id() -> Optional[str]:
     """The provider Cinematic/Autofit should use.
 
@@ -239,12 +271,11 @@ def active_provider_id() -> Optional[str]:
     configured provider → None. Legacy ``TRANSLATE_BASE_URL`` users with no
     explicit selection resolve to ``custom`` (its envs are TRANSLATE_*).
     """
-    from services import settings_store
     env_pick = os.environ.get("LLM_DEFAULT_PROVIDER")
     if env_pick and env_pick in _BY_ID:
         return env_pick
-    stored = settings_store.get_text(_ACTIVE_PROVIDER_KEY)
-    if stored and stored in _BY_ID:
+    stored = stored_active_provider_id()
+    if stored:
         return stored
     # Legacy: a lone TRANSLATE_BASE_URL means the old single-endpoint setup.
     if os.environ.get("TRANSLATE_BASE_URL"):
@@ -286,26 +317,121 @@ def save_overrides(pid: str, *, base_url: Optional[str] = None,
     from services import settings_store
     if pid not in _BY_ID:
         raise ValueError(f"unknown provider {pid!r}")
+    p = _BY_ID[pid]
     if base_url is not None:
-        settings_store.set_text(_BASE_URL_KEY + pid, base_url.strip())
+        bu = base_url.strip()
+        # Never freeze an override that equals the built-in default. Critical
+        # for account-templated URLs (Cloudflare): persisting the shown value
+        # would pin the base_url and stop later account-id edits from taking
+        # effect. Clearing (→ empty) falls the resolver back to the default
+        # template so substitution stays live. Also self-heals a stale override
+        # if a provider's default URL changes in a future release.
+        settings_store.set_text(_BASE_URL_KEY + pid, "" if bu == p.default_base_url else bu)
     if model is not None:
         settings_store.set_text(_MODEL_KEY + pid, model.strip())
     if account_id is not None:
         settings_store.set_text(f"llm.account.{pid}", account_id.strip())
 
 
+def _active_env_pin() -> Optional[str]:
+    """The provider id pinned by ``LLM_DEFAULT_PROVIDER`` (if set + valid)."""
+    pick = os.environ.get("LLM_DEFAULT_PROVIDER")
+    return pick if pick and pick in _BY_ID else None
+
+
 def describe(p: Provider) -> dict:
-    """Client-safe provider descriptor — NEVER includes the key material."""
-    return {
+    """Client-safe provider descriptor — NEVER includes the key material.
+
+    The ``*_from_env`` booleans mirror ``key_from_env`` so the UI can disable an
+    env-pinned field (and the make-active button) with an explainer instead of
+    letting the user edit a value the resolver will silently override. ``base_url``
+    is the RAW template (``substitute=False``) so an account-scoped default shows
+    ``{account_id}`` rather than a baked-in value; ``account_id`` is returned
+    separately for account-scoped providers so the field can round-trip.
+    """
+    d = {
         "id": p.id,
         "display_name": p.display_name,
         "local": p.local,
         "needs_account": p.needs_account,
         "signup_url": p.signup_url,
         "notes": p.notes,
-        "base_url": resolve_base_url(p),
+        "base_url": resolve_base_url(p, substitute=False),
         "model": resolve_model(p),
         "has_key": has_key(p),
         "key_from_env": bool(_env_first(p.key_envs)),
+        "base_url_from_env": bool(p.base_url_env and os.environ.get(p.base_url_env)),
+        "model_from_env": bool(p.model_env and os.environ.get(p.model_env)),
+        "active_from_env": _active_env_pin() is not None,
         "configured": is_configured(p),
     }
+    if p.needs_account:
+        d["account_id"] = resolve_account_id(p)
+        d["account_from_env"] = bool(p.account_env and os.environ.get(p.account_env))
+    return d
+
+
+# ── Legacy TRANSLATE_* prefs migration (#963) ──────────────────────────────
+
+# prefs.json row → the custom-provider field it becomes.
+_LEGACY_TRANSLATE_PREFS: tuple[tuple[str, str], ...] = (
+    ("env.TRANSLATE_BASE_URL", "base_url"),
+    ("env.TRANSLATE_MODEL", "model"),
+    ("env.TRANSLATE_API_KEY", "api_key"),
+)
+
+
+def migrate_legacy_translate_prefs() -> bool:
+    """Move the retired (≤v0.3.7) Translation-LLM panel's prefs rows into the
+    ``custom`` provider's own settings-store rows, then delete them.
+
+    Those ``env.TRANSLATE_*`` rows in prefs.json are re-imported into
+    ``os.environ`` on every launch (main.py), and a live ``TRANSLATE_BASE_URL``
+    makes :func:`active_provider_id` resolve to ``custom`` ahead of the stored
+    selection fallbacks — silently hijacking the active slot on every restart
+    (issue #963, "Ollama works until I restart"). Must run BEFORE main.py's
+    prefs→env import so the rows never reach the environment.
+
+    Semantics:
+      * Each value is copied only where the store has no value yet — a user's
+        later edit of the custom provider always wins over legacy leftovers.
+      * The prefs row is deleted afterwards either way, so it can never be
+        re-imported as env again (the migration is one-shot per row).
+      * Real process env vars are NEVER touched — a shell/.env
+        ``TRANSLATE_BASE_URL`` keeps its documented override behavior.
+      * A row whose store write fails is kept in prefs (it still works via the
+        env import this launch and the migration retries next launch).
+
+    Returns True if any prefs row was migrated/removed.
+    """
+    from core import prefs
+    from services import settings_store
+
+    changed = False
+    for prefs_key, field in _LEGACY_TRANSLATE_PREFS:
+        try:
+            raw = prefs.get(prefs_key)
+        except Exception:
+            logger.exception("legacy TRANSLATE prefs read failed (%s)", prefs_key)
+            return changed
+        if raw is None:
+            continue
+        val = str(raw).strip()
+        try:
+            if val:
+                if field == "base_url":
+                    if not settings_store.get_text(_BASE_URL_KEY + "custom"):
+                        save_overrides("custom", base_url=val)
+                elif field == "model":
+                    if not settings_store.get_text(_MODEL_KEY + "custom"):
+                        save_overrides("custom", model=val)
+                else:  # api_key — encrypted store, never overwrite an existing one
+                    if not _key_in_store("custom"):
+                        save_key("custom", val)
+            prefs.delete(prefs_key)
+            changed = True
+        except Exception:
+            # Store not ready (e.g. settings table missing) — keep the prefs
+            # row so the legacy env import still works and we retry next boot.
+            logger.exception("legacy TRANSLATE prefs migration failed (%s)", prefs_key)
+    return changed

backend/services/llm_skills.py

@@ -0,0 +1,323 @@
+"""LLM Skills registry — per-feature enable/route control for every LLM call.
+
+Every LLM-powered capability ("skill") in the backend is registered here, so
+the Settings → LLM Skills panel can (a) toggle it and (b) route it to a
+specific provider (a local Ollama/LM Studio vs a remote key) instead of
+everything riding the one global active provider.
+
+The six consumption points today:
+
+    dub_translation       — api/routers/dub_translate.py (the Dub tab's direct
+                            "LLM" translation engine; provider=openai branch)
+    cinematic_translation — services/translator.py (Cinematic + Autofit
+                            REFLECT/ADAPT rewrite; dub_translate quality gate)
+    slot_fitting          — services/speech_rate.py (trim/expand a line to its
+                            time slot; Autofit strict pass + /tools/rate-fit)
+    glossary_extract      — api/routers/glossary.py auto-extract
+    direction_parse       — services/director.py (natural-language direction →
+                            taxonomy tokens; /tools/direction + dub generate)
+    dictation_refinement  — services/refinement.py (dictation transcript
+                            cleanup on finals)
+
+Design rules:
+
+* **Disabled == unconfigured.** A disabled skill degrades through the exact
+  same path the feature takes today when no LLM is configured (Fast
+  translation fallback, refinement pass-through, heuristic direction parse,
+  no-llm slot fit, 503 on glossary auto-extract). No new degradation modes.
+* **Override > active > none.** A per-skill provider override (persisted in
+  settings_store) wins over the global active provider. No override → the
+  active provider, resolved exactly as before (so existing setups see zero
+  behavior change; all skills default to enabled with no override).
+* **Persistence** is two plaintext settings rows per skill:
+  ``llm_skill.<id>.enabled`` ("1"/"0", absent = enabled) and
+  ``llm_skill.<id>.provider`` (provider id, absent/empty = active provider).
+  Keys stay in the provider registry (encrypted) — nothing secret here.
+* ``OMNIVOICE_LLM_BACKEND=off`` remains the global kill switch: it also
+  silences skills routed through a per-skill override.
+"""
+from __future__ import annotations
+
+import logging
+import os
+from dataclasses import dataclass
+from typing import Any, Callable, Optional
+
+logger = logging.getLogger("omnivoice.llm_skills")
+
+_ENABLED_KEY = "llm_skill.{sid}.enabled"
+_PROVIDER_KEY = "llm_skill.{sid}.provider"
+
+_UNSET = object()
+
+
+@dataclass(frozen=True)
+class LLMSkill:
+    """A registered LLM consumption point. name/description resolve via the
+    frontend i18n layer (localization hard rule — no hardcoded UI text)."""
+
+    id: str
+    name_key: str
+    description_key: str
+
+
+def _skill(sid: str) -> LLMSkill:
+    return LLMSkill(
+        id=sid,
+        name_key=f"settings.llmskills_{sid}_name",
+        description_key=f"settings.llmskills_{sid}_desc",
+    )
+
+
+# Display order in the settings panel: the dub pipeline first (translation →
+# refine → fit → glossary → direction), then dictation.
+_SKILLS: tuple[LLMSkill, ...] = (
+    _skill("dub_translation"),
+    _skill("cinematic_translation"),
+    _skill("slot_fitting"),
+    _skill("glossary_extract"),
+    _skill("direction_parse"),
+    _skill("dictation_refinement"),
+)
+
+_BY_ID: dict[str, LLMSkill] = {s.id: s for s in _SKILLS}
+
+
+def all_skills() -> tuple[LLMSkill, ...]:
+    return _SKILLS
+
+
+def get_skill(skill_id: str) -> Optional[LLMSkill]:
+    return _BY_ID.get(skill_id)
+
+
+# ── Persistence (settings_store text rows) ─────────────────────────────────
+
+
+def is_enabled(skill_id: str) -> bool:
+    """Skill toggle. Absent row = enabled (all skills default on)."""
+    from services import settings_store
+
+    raw = settings_store.get_text(_ENABLED_KEY.format(sid=skill_id))
+    return raw != "0"
+
+
+def provider_override(skill_id: str) -> Optional[str]:
+    """The per-skill provider id, or None when the skill follows the active
+    provider. A stored id that no longer exists in the registry reads as None
+    (stale override — resolution falls back to the active provider)."""
+    from services import llm_providers, settings_store
+
+    raw = (settings_store.get_text(_PROVIDER_KEY.format(sid=skill_id)) or "").strip()
+    if not raw:
+        return None
+    if llm_providers.get_provider(raw) is None:
+        logger.warning("llm_skills: stale provider override %r on %s — ignoring",
+                       raw, skill_id)
+        return None
+    return raw
+
+
+def configure_skill(skill_id: str, *, enabled: Optional[bool] = None,
+                    provider_override: Any = _UNSET) -> None:
+    """Persist a skill's toggle and/or provider routing.
+
+    ``provider_override``: omit to leave unchanged; ``None``/``""`` clears it
+    (skill follows the active provider); a provider id routes the skill there.
+    Raises KeyError for an unknown skill, ValueError for an unknown provider.
+    """
+    if skill_id not in _BY_ID:
+        raise KeyError(f"unknown LLM skill {skill_id!r}. Known: {sorted(_BY_ID)}")
+    from services import llm_providers, settings_store
+
+    if enabled is not None:
+        settings_store.set_text(_ENABLED_KEY.format(sid=skill_id),
+                                "1" if enabled else "0")
+    if provider_override is not _UNSET:
+        pid = (provider_override or "").strip()
+        if pid and llm_providers.get_provider(pid) is None:
+            raise ValueError(f"unknown provider {pid!r}")
+        settings_store.set_text(_PROVIDER_KEY.format(sid=skill_id), pid)
+
+
+# ── Resolution (override > active > none) ──────────────────────────────────
+
+
+@dataclass(frozen=True)
+class SkillResolution:
+    skill: LLMSkill
+    enabled: bool
+    provider: Optional[Any]      # llm_providers.Provider or None
+    source: str                  # "override" | "active" | "none"
+    ready: bool
+    reason: Optional[str]        # None | "disabled" | "no_provider" | "unconfigured"
+
+
+def resolve_skill(skill_id: str) -> SkillResolution:
+    """Resolve a skill's effective provider + ready status.
+
+    Precedence: per-skill override → global active provider → none. Ready
+    means enabled AND the effective provider is configured end-to-end.
+    Raises KeyError for an unknown skill.
+    """
+    skill = _BY_ID.get(skill_id)
+    if skill is None:
+        raise KeyError(f"unknown LLM skill {skill_id!r}. Known: {sorted(_BY_ID)}")
+    from services import llm_providers
+
+    enabled = is_enabled(skill_id)
+    override = provider_override(skill_id)
+    if override:
+        provider = llm_providers.get_provider(override)
+        source = "override"
+    else:
+        provider = llm_providers.active_provider()
+        source = "active" if provider is not None else "none"
+
+    if not enabled:
+        ready, reason = False, "disabled"
+    elif provider is None:
+        ready, reason = False, "no_provider"
+    elif not llm_providers.is_configured(provider):
+        ready, reason = False, "unconfigured"
+    else:
+        ready, reason = True, None
+    return SkillResolution(skill=skill, enabled=enabled, provider=provider,
+                           source=source, ready=ready, reason=reason)
+
+
+def effective_provider(skill_id: str) -> Optional[Any]:
+    """The provider a skill would call (override or active), or None."""
+    return resolve_skill(skill_id).provider
+
+
+# ── Client / backend construction ───────────────────────────────────────────
+
+
+@dataclass(frozen=True)
+class SkillClient:
+    """A ready-to-call OpenAI-compatible client bound to the skill's provider."""
+
+    client: Any        # openai.OpenAI
+    model: str
+    provider_id: str
+    timeout: float
+
+
+def _default_timeout() -> float:
+    try:
+        return float(os.environ.get("OMNIVOICE_LLM_TIMEOUT", "45"))
+    except ValueError:
+        return 45.0
+
+
+def resolve_skill_client(skill_id: str) -> Optional[SkillClient]:
+    """OpenAI-compat client + model for a skill, or None.
+
+    None when the skill is disabled, no provider resolves, the provider is
+    unconfigured, or the openai package is missing — callers treat None
+    exactly like "no LLM configured" (their existing degradation path).
+    Raises KeyError for an unknown skill (programming error, not user state).
+    """
+    res = resolve_skill(skill_id)
+    if not res.ready:
+        return None
+    try:
+        from openai import OpenAI
+    except ImportError:
+        logger.warning("openai package not installed — LLM skill %s unavailable.",
+                       skill_id)
+        return None
+    from services import llm_providers
+
+    api_key = llm_providers.resolve_api_key(res.provider)
+    if not api_key:
+        return None
+    kw: dict[str, Any] = {"api_key": api_key}
+    base_url = llm_providers.resolve_base_url(res.provider)
+    if base_url:
+        kw["base_url"] = base_url
+    # max_retries=0: a rate-limited provider returning 429 + a long Retry-After
+    # would otherwise let the SDK sleep+retry inside a single call, blowing the
+    # skill's wall-clock budget (the cinematic pass budget, the glossary call
+    # timeout) from inside one request. Fail fast — the per-call timeout and the
+    # pass-level budget are the only bounds we want. Mirrors OpenAICompatBackend.
+    #
+    # #959 class guard: OpenAI() eagerly builds its httpx client, which can
+    # raise AT CONSTRUCTION for environment-shaped reasons — the reported one
+    # is httpx's ImportError under ALL_PROXY/HTTPS_PROXY=socks5:// without
+    # socksio; a malformed proxy URL or broken cert bundle fails the same way.
+    # The contract here is already "None == LLM unavailable, degrade" — a bad
+    # proxy env must degrade the skill, never 500 the calling feature.
+    try:
+        client = OpenAI(max_retries=0, **kw)
+    except Exception as exc:
+        logger.warning(
+            "LLM client construction failed for skill %s (provider %s): %s — "
+            "treating the skill as unavailable.",
+            skill_id, res.provider.id, exc,
+        )
+        return None
+    return SkillClient(
+        client=client,
+        model=llm_providers.resolve_model(res.provider),
+        provider_id=res.provider.id,
+        timeout=_default_timeout(),
+    )
+
+
+def skill_backend(skill_id: str, active: Optional[Callable[[], Any]] = None):
+    """LLMBackend for a skill — the drop-in for ``get_active_llm_backend()``.
+
+    * disabled skill → OffBackend (same object the no-LLM path returns today,
+      so every caller's ``id == "off"`` / ``isinstance(…, OffBackend)`` check
+      degrades identically);
+    * no override → the ``active`` callable (callers pass their module-local
+      ``get_active_llm_backend`` so existing monkeypatch seams keep working),
+      defaulting to ``llm_backend.get_active_llm_backend`` — the exact legacy
+      path, env/prefs overrides included;
+    * override → an OpenAICompatBackend bound to that provider, or OffBackend
+      when the provider is unconfigured, openai is missing, or the global
+      ``OMNIVOICE_LLM_BACKEND=off`` kill switch is set.
+    """
+    from services.llm_backend import OffBackend, OpenAICompatBackend
+
+    res = resolve_skill(skill_id)
+    if not res.enabled:
+        return OffBackend()
+    if res.source != "override":
+        if active is not None:
+            return active()
+        from services import llm_backend
+        return llm_backend.get_active_llm_backend()
+    if os.environ.get("OMNIVOICE_LLM_BACKEND") == "off":
+        return OffBackend()
+    if not res.ready:
+        return OffBackend()
+    try:
+        import openai  # noqa: F401
+    except ImportError:
+        return OffBackend()
+    return OpenAICompatBackend(provider=res.provider)
+
+
+# ── API descriptor ──────────────────────────────────────────────────────────
+
+
+def describe(skill_id: str) -> dict:
+    """Client-safe skill descriptor for GET /api/settings/llm-skills."""
+    res = resolve_skill(skill_id)
+    p = res.provider
+    return {
+        "id": res.skill.id,
+        "name_key": res.skill.name_key,
+        "description_key": res.skill.description_key,
+        "enabled": res.enabled,
+        "provider_override": provider_override(skill_id),
+        "provider": p.id if p is not None else None,
+        "provider_display_name": p.display_name if p is not None else None,
+        "provider_local": p.local if p is not None else None,
+        "provider_source": res.source,
+        "ready": res.ready,
+        "reason": res.reason,
+    }

backend/services/model_lifecycle.py

@@ -45,11 +45,33 @@ def _asr_device() -> str:
     return "cpu"
 
 
+def _active_tts_id() -> Optional[str]:
+    """Configured TTS engine id, or None if it can't be resolved. Attribution
+    is advisory — a prefs/import hiccup must never break /model/loaded."""
+    try:
+        from services.tts_backend import active_backend_id
+        return active_backend_id()
+    except Exception:
+        return None
+
+
+def _tts_attribution(engine_id: str, active: Optional[str]) -> dict:
+    """Per-entry engine attribution for TTS-family models. A model can stay
+    resident in VRAM after the user switches engines (freed only by unload/
+    idle-evict), so the panel needs to know which entry synthesis actually
+    routes to. ``is_active_engine`` is None when the active id is unknown."""
+    return {
+        "engine_id": engine_id,
+        "is_active_engine": (engine_id == active) if active is not None else None,
+    }
+
+
 def list_loaded() -> dict:
     """Enumerate every currently-loaded model. Shape: ``{"models": [...],
     "count": n}`` with per-model id/name/checkpoint/device/vram_mb/unloadable
     (+ optional ``note``)."""
     models: list[dict] = []
+    active_tts = _active_tts_id()
 
     # 1. In-process TTS model (OmniVoice)
     if mm.model is not None:
@@ -64,6 +86,7 @@ def list_loaded() -> dict:
             "device": device,
             "vram_mb": round(_tts_vram_mb(), 1),
             "unloadable": True,
+            **_tts_attribution("omnivoice", active_tts),
         })
 
     # 2. ASR (WhisperX) — co-loaded with and released alongside the TTS model.
@@ -105,6 +128,7 @@ def list_loaded() -> dict:
                 "device": get_best_device(),
                 "vram_mb": round(float(s.get("vram_mb") or 0), 1),
                 "unloadable": True,
+                **_tts_attribution(s["id"], active_tts),
             })
     except Exception:
         pass

backend/services/model_manager.py

@@ -249,15 +249,40 @@ async def run_on_gpu_pool_guarded(fn, *, what: str = "GPU job",
                 )
             except Exception:
                 logger.exception("GPU pool reset after %s timeout failed", what)
-        raise GpuJobTimeoutError(
-            f"{what} exceeded {timeout:.0f}s and was abandoned — the backend is "
-            "running, but the job was too heavy for the available compute. Most "
-            "often the GPU is VRAM-starved (a resident model and this job contend "
-            "for memory). Capacity was restored automatically; for a durable fix "
-            "try shorter text, a lighter engine, or set the engine to CPU in "
-            "Settings → Models. (Raise OMNIVOICE_GENERATE_TIMEOUT_S for very long "
-            "single generations.)"
+        raise GpuJobTimeoutError(_timeout_guidance(what, timeout))
+
+
+def _timeout_guidance(what: str, timeout: float) -> str:
+    """Device-aware timeout message (#896): a CPU-only host must never be told
+    to "set the engine to CPU" or blamed on VRAM — on CPU the job is simply
+    compute-bound. GPU hosts keep the VRAM-contention guidance."""
+    family = "cuda"  # conservative default: GPU wording if the probe fails
+    try:
+        from core.device_caps import detect_host_caps
+        family = detect_host_caps().family
+    except Exception:  # noqa: BLE001 — guidance must never mask the timeout
+        pass
+    common = (
+        f"{what} exceeded {timeout:.0f}s and was abandoned — the backend is "
+        "running, but the job was too heavy for the available compute. "
+        "Capacity was restored automatically; "
+    )
+    if family == "cpu":
+        return common + (
+            "this machine renders on CPU, where long generations are "
+            "compute-bound. For a durable fix try shorter text or a lighter "
+            "engine (OmniVoice GGUF and Supertonic-3 are CPU-tuned). If you "
+            "expect very long single generations, raise "
+            "OMNIVOICE_GENERATE_TIMEOUT_S."
         )
+    return common + (
+        "most often the GPU is VRAM-starved (a resident model and this job "
+        "contend for memory). For a durable fix, Flush caches / Unload the "
+        "resident model (top toolbar or Settings → Models) before retrying, "
+        "try shorter text, a lighter engine, or set the engine to CPU in "
+        "Settings → Models. (Raise OMNIVOICE_GENERATE_TIMEOUT_S for very "
+        "long single generations.)"
+    )
 
 
 model = None  # type: ignore
@@ -632,6 +657,29 @@ def _hf_offline() -> bool:
     return _env_flag("HF_HUB_OFFLINE") or _env_flag("TRANSFORMERS_OFFLINE")
 
 
+# Why the LAST _repair_model_cache run failed ("" when it succeeded / hasn't
+# run). #886: the "could not be auto-repaired" message used to drop the cause
+# entirely, so a mirror outage, offline mode, or a full disk all read the same.
+_last_repair_error: str = ""
+
+
+def _repair_failure_detail() -> str:
+    """One sanitized clause naming why auto-repair failed, or "" (#886).
+
+    Feeds user-facing messages (the generate 500 detail / model status), so it
+    goes through core.failure.sanitize — and because the cause text is now part
+    of the surfaced error, the shared HF-mirror hint (#874) fires on it when
+    the repair failed against an unreachable configured mirror."""
+    if not _last_repair_error:
+        return ""
+    try:
+        from core.failure import sanitize
+        cause = sanitize(_last_repair_error)
+    except Exception:
+        cause = _last_repair_error
+    return f" Auto-repair failed with: {cause}."
+
+
 def _repair_model_cache(checkpoint: str, *, force: bool = False) -> bool:
     """Re-fetch a checkpoint's missing files in place and report success.
 
@@ -648,16 +696,22 @@ def _repair_model_cache(checkpoint: str, *, force: bool = False) -> bool:
     size won't be re-fetched by the default resume (#739). It re-downloads the
     whole snapshot, so it's the last resort the load path only reaches after a
     plain resume-repair didn't fix the cache."""
+    global _last_repair_error
+    _last_repair_error = ""
     if _hf_offline():
         logger.warning(
             "Model cache for %s is incomplete but HF offline mode is set — "
             "cannot auto-repair.", checkpoint,
         )
+        _last_repair_error = (
+            "Hugging Face offline mode is enabled (HF_HUB_OFFLINE/TRANSFORMERS_OFFLINE)"
+        )
         return False
     try:
         from huggingface_hub import snapshot_download
     except Exception as imp_err:  # pragma: no cover - huggingface_hub is a hard dep
         logger.warning("Cannot import snapshot_download to repair cache: %s", imp_err)
+        _last_repair_error = f"{type(imp_err).__name__}: {imp_err}"
         return False
     dl_kwargs: dict = {"repo_id": checkpoint}
     endpoint = os.environ.get("HF_ENDPOINT")
@@ -710,6 +764,7 @@ def _repair_model_cache(checkpoint: str, *, force: bool = False) -> bool:
                 "Auto-repair of %s attempt %d/%d failed: %s",
                 checkpoint, attempt, retries, e,
             )
+            _last_repair_error = f"{type(e).__name__}: {e}"
             if attempt < retries and backoff:
                 time.sleep(backoff * attempt)
     return False
@@ -801,7 +856,8 @@ def _load_model_sync():
             if not _repair_model_cache(checkpoint):
                 raise RuntimeError(
                     f"The TTS model cache for {checkpoint} is incomplete "
-                    "(weights missing — usually an interrupted download). "
+                    "(weights missing — usually an interrupted download)."
+                    f"{_repair_failure_detail()} "
                     "Open Settings → Models, delete the OmniVoice TTS model, "
                     "and install it again."
                 ) from e
@@ -830,8 +886,9 @@ def _load_model_sync():
                     else:
                         raise RuntimeError(
                             f"The TTS model cache for {checkpoint} is incomplete and "
-                            "could not be auto-repaired. Open Settings → Models, "
-                            "delete the OmniVoice TTS model, and install it again."
+                            f"could not be auto-repaired.{_repair_failure_detail()} "
+                            "Open Settings → Models, delete the OmniVoice TTS model, "
+                            "and install it again."
                         ) from e2
                 else:
                     raise RuntimeError(
@@ -967,6 +1024,22 @@ async def get_model():
     return model
 
 
+def _checkpoint_in_local_cache(checkpoint: str) -> bool:
+    """True when ``checkpoint`` is loadable with NO network: an existing local
+    directory, or a COMPLETE HF cache snapshot. ``snapshot_download(...,
+    local_files_only=True)`` never constructs an HTTP session, so a broken
+    proxy env (#959: ``ALL_PROXY``/``HTTPS_PROXY=socks5://`` without socksio)
+    can't false-negative this probe. Never raises."""
+    if os.path.isdir(checkpoint):
+        return True
+    try:
+        from huggingface_hub import snapshot_download
+        snapshot_download(checkpoint, local_files_only=True)
+        return True
+    except Exception:
+        return False
+
+
 async def preload_model():
     """Background model warm-up — call from lifespan startup.
 
@@ -987,10 +1060,27 @@ async def preload_model():
         try:
             from huggingface_hub import model_info
             model_info(checkpoint, timeout=5)
-        except Exception:
-            # Model not downloaded yet — skip preload
-            logger.info("Preload skipped: %s not available locally.", checkpoint)
-            return
+        except Exception as probe_err:
+            # The probe failing does NOT mean the model isn't installed — it
+            # means the Hub API wasn't reachable from this process. The #959
+            # class: under ALL_PROXY/HTTPS_PROXY=socks5:// without socksio,
+            # hf_hub's get_session() raises ImportError AT CLIENT CONSTRUCTION;
+            # same story for offline mode, DNS, or firewall failures. Fall back
+            # to a cache-only probe (no HTTP session involved) and warm up
+            # anyway when the model is locally present, instead of silently
+            # skipping and letting the first /generate eat the full load.
+            if not _checkpoint_in_local_cache(checkpoint):
+                logger.info(
+                    "Preload skipped: %s not available locally (network probe "
+                    "failed: %s: %s).",
+                    checkpoint, type(probe_err).__name__, probe_err,
+                )
+                return
+            logger.warning(
+                "Network probe for %s failed (%s: %s) — model found in the "
+                "local cache; warming up from cache.",
+                checkpoint, type(probe_err).__name__, probe_err,
+            )
 
         logger.info("Preloading TTS model in background…")
         _last_used = time.time()

backend/services/onset_align.py

@@ -10,8 +10,8 @@ plays the moment the video begins and everything feels desynchronised.
 ``snap_segment_starts`` post-processes segments against the actual audio
 (ideally the Demucs-isolated vocals track, which the dub pipeline already
 produces): for each segment it scans the waveform inside ``[start, end]``
-for the first frame whose RMS rises above an adaptive threshold and moves
-``start`` forward to just before that onset.
+for the first *sustained* rise of frame RMS above an adaptive threshold
+and moves ``start`` forward to just before that onset.
 
 Design constraints:
 
@@ -23,6 +23,27 @@ Design constraints:
   (no frame above the absolute floor) are left untouched.
 * **Pure NumPy.** No model, no platform-specific code — identical
   behaviour on macOS / Windows / Linux, trivially unit-testable.
+
+Robustness against non-speech onsets (#963): a field report showed dubbed
+lines starting seconds off because "when a noise is heard (a sigh or
+footsteps), it's interpreted as the start of the conversation". Three
+guards address that class of failure:
+
+* **Sustained energy.** A frame only counts as an onset when the energy
+  stays up for a speech-like duration (``SUSTAIN_MIN_S`` within the
+  following ``SUSTAIN_WINDOW_S``). Footsteps/door thuds/clicks light up
+  one or two 20 ms frames and die; syllables keep the energy up.
+* **Bounded snap distance.** Shifts beyond ``MAX_SNAP_S`` are only
+  trusted when everything being skipped is (near-)silence — the genuine
+  #280 whisper start-stretch, where Demucs removed the leading music and
+  left real silence on the vocals track. Jumping far over *audible*
+  content (e.g. quiet speech sitting under the relative threshold) would
+  play the dub seconds late, so it is refused.
+* **Source-aware.** Snapping only runs on a separated vocals track
+  (``separated_vocals=True``). On mixed/original audio — Demucs skipped
+  or failed — music, ambience and room tone are all legitimate sustained
+  energy, so any detected "onset" is as likely the score as the speaker;
+  whisper's own timestamps beat a confidently wrong snap.
 """
 from __future__ import annotations
 
@@ -51,6 +72,23 @@ RELATIVE_THRESHOLD = 0.10
 # the whole window is treated as silence and left alone (we'd only be
 # snapping to noise).
 ABS_RMS_FLOOR = 1e-3
+# An onset must be *sustained* to count as speech (#963): within the
+# SUSTAIN_WINDOW_S that follows a candidate frame, at least SUSTAIN_MIN_S
+# worth of frames must also sit above the threshold. A ~100 ms footstep
+# burst fails this; real speech (syllables every few hundred ms) passes.
+SUSTAIN_WINDOW_S = 0.30
+SUSTAIN_MIN_S = 0.16
+# Snaps larger than this are only trusted when the skipped span is
+# (near-)silence — see _region_mostly_silent (#963).
+MAX_SNAP_S = 1.5
+# The skipped span counts as "mostly silent" when at most this fraction of
+# its frames is audible. Non-zero so an isolated transient bleeding through
+# separation (a footstep) doesn't block a genuine long silence-trim…
+SKIPPED_AUDIBLE_FRAC = 0.10
+# …where "audible" = above max(ABS_RMS_FLOOR, this fraction of the span's
+# own peak); the relative term keeps a slightly raised residual noise floor
+# from reading as content.
+SKIPPED_FLOOR_PEAK_FRAC = 0.02
 
 
 def _frame_rms(x: np.ndarray, frame_len: int) -> np.ndarray:
@@ -70,6 +108,15 @@ def detect_speech_onset(
 ) -> float | None:
     """Return the absolute time (s) of the first speech-like frame inside
     ``[start_s, end_s]``, or ``None`` when the window is empty / silent.
+
+    "Speech-like" requires *sustained* energy (#963): within the
+    ``SUSTAIN_WINDOW_S`` look-ahead after a candidate frame, at least
+    ``SUSTAIN_MIN_S`` worth of frames must also exceed the threshold.
+    Short broadband transients — footsteps, door thuds, mouse clicks —
+    light up one or two 20 ms frames and then die, so they no longer read
+    as "the conversation started here"; real speech keeps the energy up
+    across syllables. A candidate too close to the window's end to prove
+    sustain is rejected (conservative: the ASR timestamp stands).
     """
     if sr <= 0 or end_s <= start_s:
         return None
@@ -86,10 +133,21 @@ def detect_speech_onset(
     if peak < ABS_RMS_FLOOR:
         return None  # whole window is effectively silent
     threshold = max(RELATIVE_THRESHOLD * peak, ABS_RMS_FLOOR)
-    above = np.nonzero(rms >= threshold)[0]
-    if above.size == 0:
+    above = rms >= threshold
+    candidates = np.nonzero(above)[0]
+    if candidates.size == 0:
         return None
-    return start_s + float(above[0]) * (frame_len / sr)
+    frame_s = frame_len / sr
+    win_frames = max(1, int(round(SUSTAIN_WINDOW_S / frame_s)))
+    need_frames = max(1, int(round(SUSTAIN_MIN_S / frame_s)))
+    # counts[k] = above-threshold frames within rms[c : c + win_frames]
+    # for candidate c — O(n) via a cumulative sum, no per-candidate scan.
+    cum = np.concatenate(([0], np.cumsum(above)))
+    counts = cum[np.minimum(candidates + win_frames, above.size)] - cum[candidates]
+    sustained = candidates[counts >= need_frames]
+    if sustained.size == 0:
+        return None  # only transient bursts in this window
+    return start_s + float(sustained[0]) * frame_s
 
 
 # Hysteresis for full-track onset listing: after a frame crosses the
@@ -138,21 +196,60 @@ def detect_speech_onsets(audio: np.ndarray, sr: int) -> list[float]:
     return onsets
 
 
+def _region_mostly_silent(
+    audio: np.ndarray,
+    sr: int,
+    start_s: float,
+    end_s: float,
+) -> bool:
+    """True when ``[start_s, end_s]`` contains (almost) no audible content.
+
+    Gates long snaps (> ``MAX_SNAP_S``, #963): jumping far forward is only
+    trustworthy when everything being skipped is silence — the genuine
+    whisper start-stretch of #280, where Demucs stripped the leading music
+    and left real silence on the vocals track. A small fraction of audible
+    frames is tolerated so an isolated transient bleeding through
+    separation (a footstep) doesn't block the trim; *sustained* audible
+    content — e.g. quiet speech sitting below the relative onset
+    threshold — does block it, because skipping past it would desync the
+    dub by the full jump.
+    """
+    i0 = max(0, int(start_s * sr))
+    i1 = min(len(audio), int(end_s * sr))
+    if i1 <= i0:
+        return True
+    rms = _frame_rms(audio[i0:i1], max(1, int(FRAME_S * sr)))
+    if rms.size == 0:
+        return True
+    floor = max(ABS_RMS_FLOOR, SKIPPED_FLOOR_PEAK_FRAC * float(rms.max()))
+    return float((rms >= floor).mean()) <= SKIPPED_AUDIBLE_FRAC
+
+
 def snap_segment_starts(
     segments: Sequence[dict],
     audio: np.ndarray,
     sr: int,
     *,
     min_shift_s: float = MIN_SHIFT_S,
+    separated_vocals: bool = True,
 ) -> int:
     """Snap each segment's ``start`` forward to the actual speech onset.
 
     Mutates the segment dicts in place (the shape the dub pipeline passes
     around). Returns the number of segments adjusted.
 
-    ``audio`` should be mono float; the Demucs vocals track gives the best
-    signal but the mixed track still beats nothing.
+    ``audio`` should be the mono-float **separated vocals** track. When the
+    caller only has mixed/original audio (Demucs skipped or failed), pass
+    ``separated_vocals=False``: snapping is then disabled entirely (#963) —
+    on a mixed track music, ambience and footsteps are all sustained energy,
+    so a detected "onset" is as likely the score as the speaker, and
+    whisper's own timestamps beat a confidently wrong snap.
     """
+    if not separated_vocals:
+        logger.info(
+            "onset-align: skipped — audio is not a separated vocals track "
+            "(Demucs unavailable/failed); keeping ASR timestamps as-is")
+        return 0
     if sr <= 0 or audio is None or len(audio) == 0:
         return 0
     if audio.ndim > 1:
@@ -174,6 +271,13 @@ def snap_segment_starts(
         shift = new_start - start
         if shift < min_shift_s:
             continue
+        if shift > MAX_SNAP_S and not _region_mostly_silent(audio, sr, start, onset):
+            # Long jump over audible content (#963): the "onset" is more
+            # likely a louder late event than the true start — quiet speech
+            # under the relative threshold would be skipped wholesale and
+            # the dub would play seconds LATE. Bounded corrections are fine;
+            # unbounded ones only over true silence (the #280 case).
+            continue
         # Preserve a minimum playable duration.
         new_start = min(new_start, end - MIN_SEG_DUR_S)
         if new_start - start < min_shift_s:

backend/services/refinement.py

@@ -19,13 +19,69 @@ Two tiers, both applied only to FINAL transcripts (never partials):
 
 from __future__ import annotations
 
+import asyncio
 import json
 import logging
+import os
 import re
+import time
 from dataclasses import dataclass
 
 logger = logging.getLogger("omnivoice.refinement")
 
+# Hard wall-clock budget (seconds) for a single dictation refinement LLM call.
+# The dictation FINAL must never be delayed longer than this by a slow or dead
+# LLM endpoint — refinement is best-effort and falls back to the unrefined
+# (but polished) text on timeout. 4s keeps a healthy local model (Ollama /
+# LM Studio, sub-second on the tiny cleanup prompt) fully usable while turning
+# the old worst case — a placeholder/dead endpoint blocking the send ~51s until
+# the widget's 15s fallback fired — into a bounded ~4s at most. Env-tunable so
+# power users on a slow local LLM can raise it. Guarded by the regression tests
+# in tests/backend/services/test_refinement_llm.py and tests/test_capture_ws.py.
+_DEFAULT_REFINE_TIMEOUT_S = 4.0
+
+
+def _refine_timeout_s() -> float:
+    """The refinement LLM budget in seconds (OMNIVOICE_REFINE_TIMEOUT_S).
+
+    Falls back to :data:`_DEFAULT_REFINE_TIMEOUT_S` on an unset/invalid/non-
+    positive value so a bad env var can never disable the bound."""
+    raw = os.environ.get("OMNIVOICE_REFINE_TIMEOUT_S", "")
+    try:
+        v = float(raw)
+        if v > 0:
+            return v
+    except (TypeError, ValueError):
+        pass
+    return _DEFAULT_REFINE_TIMEOUT_S
+
+
+# Most-recent refinement outcome, so the Settings panel can tell the user when a
+# configured LLM is actually failing/timing out (the honesty layer behind the
+# `llm_ready` flag, which only means "an endpoint is configured"). Best-effort,
+# process-local, cleared on success.
+_last_refine_status: dict | None = None
+
+
+def _note_refine_status(*, ok: bool, reason: str | None = None) -> None:
+    global _last_refine_status
+    _last_refine_status = {"ok": bool(ok), "reason": reason, "at": time.time()}
+
+
+def get_last_refine_status() -> dict | None:
+    """The last refinement outcome as ``{ok, reason, at}`` or None if refinement
+    hasn't run this session. ``ok=False`` with ``reason`` ("timeout" or a short
+    error string) means a configured LLM failed the most recent final."""
+    return dict(_last_refine_status) if _last_refine_status else None
+
+
+def _short_reason(exc: Exception) -> str:
+    """A compact, non-leaky label for a refinement failure (for the UI hint)."""
+    name = type(exc).__name__
+    if "Timeout" in name or "timeout" in str(exc).lower():
+        return "timeout"
+    return name
+
 # A token (or unit) must repeat at least this many times consecutively to be
 # treated as an STT artifact. Rhetorical repetition ("no, no, no, no, no" —
 # five repeats) stays below the threshold and survives.
@@ -248,6 +304,19 @@ REFINEMENT_EXAMPLES: list[tuple[str, str]] = [
 # settings_store key holding the user's refinement config (plain JSON).
 _SETTINGS_KEY = "dictation_refinement"
 
+# LLM Skills registry id — Settings → LLM Skills can disable refinement's LLM
+# use or route it to a specific provider. Disabled == identical pass-through
+# (the same path as "no LLM configured").
+_SKILL_ID = "dictation_refinement"
+
+
+def _skill_llm():
+    """The skill-resolved backend (OffBackend when disabled/unconfigured)."""
+    from services import llm_skills
+    from services.llm_backend import get_active_llm_backend
+
+    return llm_skills.skill_backend(_SKILL_ID, active=get_active_llm_backend)
+
 
 def get_refinement_config() -> dict:
     """Read the persisted config: {auto, smart_cleanup, self_correction,
@@ -274,43 +343,97 @@ def set_refinement_config(cfg: dict) -> dict:
     return merged
 
 
-def refine_transcript(transcript: str, flags: RefinementFlags | None = None) -> str:
+def refine_transcript(
+    transcript: str,
+    flags: RefinementFlags | None = None,
+    *,
+    timeout_s: float | None = None,
+) -> str:
     """Run the transcript through the configured LLM. Raises on failure —
-    callers decide the fallback (maybe_refine swallows into pass-through)."""
-    from services.llm_backend import get_active_llm_backend
+    callers decide the fallback (maybe_refine swallows into pass-through).
 
+    The LLM HTTP call is bounded by ``timeout_s`` (default: the refinement
+    budget) so a dead/slow endpoint can't tie the call up for the client's full
+    45s LLM timeout — the class of stall this whole module guards against."""
     flags = flags or RefinementFlags()
-    backend = get_active_llm_backend()
+    backend = _skill_llm()
     messages = [{"role": "system", "content": build_refinement_prompt(flags)}]
     for user_turn, assistant_turn in REFINEMENT_EXAMPLES:
         messages.append({"role": "user", "content": user_turn})
         messages.append({"role": "assistant", "content": assistant_turn})
     messages.append({"role": "user", "content": transcript})
-    return backend.chat_messages(messages=messages).strip()
+    budget = timeout_s if timeout_s is not None else _refine_timeout_s()
+    return backend.chat_messages(messages=messages, timeout=budget).strip()
 
 
-def maybe_refine(transcript: str) -> str | None:
+def maybe_refine(transcript: str, *, timeout_s: float | None = None) -> str | None:
     """Best-effort refinement for the dictation final path.
 
     Returns the refined text, or None when refinement is off, no LLM
     backend is configured, the result is empty, or anything fails — the
-    raw transcript always stands. Never raises.
+    raw transcript always stands. Never raises. Records the outcome via
+    :func:`get_last_refine_status` so the UI can flag a failing LLM.
+
+    Blocking (network I/O); the WS/REST callers run it off-thread. Prefer
+    :func:`maybe_refine_async` on the live-dictation path — it adds the hard
+    wall-clock bound so a slow endpoint can never delay the ``final`` send.
     """
     if not transcript or not transcript.strip():
         return None
+    cfg = get_refinement_config()
+    if not cfg.get("auto", True):
+        return None
+    backend = _skill_llm()
+    if backend.id == "off":
+        # No LLM configured — or the dictation_refinement skill is disabled /
+        # routed to an unconfigured provider — is not a failure. Leave the last
+        # status untouched (same pass-through as today).
+        return None
     try:
-        cfg = get_refinement_config()
-        if not cfg.get("auto", True):
-            return None
-        from services.llm_backend import get_active_llm_backend
-
-        backend = get_active_llm_backend()
-        if backend.id == "off":
-            return None
-        refined = refine_transcript(transcript, RefinementFlags.from_dict(cfg))
+        refined = refine_transcript(
+            transcript, RefinementFlags.from_dict(cfg), timeout_s=timeout_s
+        )
         if not refined:
             return None
+        _note_refine_status(ok=True)
         return refined
     except Exception as e:  # noqa: BLE001 — pass-through is the contract
         logger.warning("Dictation refinement skipped: %s", e)
+        _note_refine_status(ok=False, reason=_short_reason(e))
+        return None
+
+
+async def maybe_refine_async(
+    transcript: str, *, timeout_s: float | None = None
+) -> str | None:
+    """Async, hard-time-bounded refinement for the live-dictation final path.
+
+    Runs :func:`maybe_refine` off-thread under a hard ``OMNIVOICE_REFINE_TIMEOUT_S``
+    (~4s) budget so a slow or dead LLM endpoint can NEVER block the caller — and
+    therefore the dictation ``final`` send — longer than the budget. On timeout
+    (or any failure) it returns None and the raw, already-polished transcript
+    stands. Never raises.
+
+    ``asyncio.wait_for`` can't cancel the worker thread, but the LLM call it runs
+    is itself bounded to the same budget (see :func:`refine_transcript`), so an
+    orphaned thread unwinds shortly after rather than lingering the full 45s.
+    """
+    if not transcript or not transcript.strip():
+        return None
+    budget = timeout_s if timeout_s is not None else _refine_timeout_s()
+    try:
+        return await asyncio.wait_for(
+            asyncio.to_thread(maybe_refine, transcript, timeout_s=budget),
+            timeout=budget,
+        )
+    except asyncio.TimeoutError:
+        logger.warning(
+            "Dictation refinement exceeded its %.1fs budget — sending the "
+            "unrefined final (set OMNIVOICE_REFINE_TIMEOUT_S to adjust).", budget,
+        )
+        _note_refine_status(ok=False, reason="timeout")
+        return None
+    except Exception as e:  # noqa: BLE001 — best-effort; the raw final stands
+        logger.warning("Dictation refinement failed: %s", e)
+        _note_refine_status(ok=False, reason=_short_reason(e))
         return None

backend/services/segmentation.py

@@ -532,14 +532,41 @@ def assign_speakers_from_turns(
     return segments
 
 
-def assign_speakers_heuristic(segments: List[dict]) -> List[dict]:
-    """Two-speaker alternation based on silence gaps."""
-    current = 1
+def assign_speakers_heuristic(
+    segments: List[dict], num_speakers: Optional[int] = None
+) -> List[dict]:
+    """Silence-gap speaker assignment (used when no diarization model runs).
+
+    Base signal: a gap > SPEAKER_GAP seconds between consecutive segments is
+    treated as a speaker change. Without a ``num_speakers`` hint this keeps
+    the legacy behavior — alternate between exactly two labels. With a hint:
+
+    * ``num_speakers=1`` → every segment gets ``"Speaker 1"``.
+    * ``num_speakers>=2`` → labels round-robin across N speakers at each
+      gap boundary, so the user's requested count is represented instead of
+      being silently capped at 2.
+
+    Limits (be honest with callers): this honors the *count*, not voice
+    identity. The rotation order is arbitrary (a returning speaker gets the
+    next label in the cycle, not their own), rapid exchanges with no
+    > SPEAKER_GAP pause still collapse into one label, and N is an upper
+    bound — audio with fewer gap boundaries than N yields fewer labels.
+    Real per-speaker attribution needs pyannote (or an inline-diarizing ASR
+    backend); callers should warn the user accordingly (see dub_core).
+    Invalid hints (non-int, < 1) fall back to the legacy two-speaker cycle.
+    """
+    try:
+        n = int(num_speakers) if num_speakers is not None else 2
+    except (TypeError, ValueError):
+        n = 2
+    if n < 1:
+        n = 2
+    current = 0  # zero-based rotation index; rendered one-based below
     last_end = 0.0
     for i, s in enumerate(segments):
-        if i > 0 and (s["start"] - last_end) > SPEAKER_GAP:
-            current = 2 if current == 1 else 1
-        s["speaker_id"] = f"Speaker {current}"
+        if i > 0 and n > 1 and (s["start"] - last_end) > SPEAKER_GAP:
+            current = (current + 1) % n
+        s["speaker_id"] = f"Speaker {current + 1}"
         last_end = s["end"]
     return segments
 

backend/services/sherpa_dictation.py

@@ -34,6 +34,23 @@ _PROVIDER = os.environ.get("OMNIVOICE_SHERPA_ASR_PROVIDER", "cpu")
 _NUM_THREADS = int(os.environ.get("OMNIVOICE_SHERPA_ASR_THREADS", "2"))
 
 
+def _endpoint_rules() -> tuple[float, float]:
+    """Trailing-silence endpoint rules (seconds) for streaming recognizers.
+
+    Wispr-Flow-speed defaults (dictation v2): rule2 commits ~0.6s after speech
+    stops, rule1 flushes after 1.0s of trailing non-speech — down from the
+    upstream 2.4/1.2, which made every committed sentence feel laggy. Read at
+    call time so the env overrides apply without a restart.
+    """
+    def _f(env: str, default: float) -> float:
+        try:
+            return float(os.environ.get(env, "") or default)
+        except (TypeError, ValueError):
+            return default
+    return (_f("OMNIVOICE_DICTATION_ENDPOINT_R1", 1.0),
+            _f("OMNIVOICE_DICTATION_ENDPOINT_R2", 0.6))
+
+
 @dataclass(frozen=True)
 class SherpaModelSpec:
     """One downloadable sherpa-onnx dictation model.
@@ -282,6 +299,7 @@ def build_online_recognizer(spec: SherpaModelSpec, *, download: bool = True):
     import sherpa_onnx
 
     d = _resolve_model_dir(spec, download=download)
+    rule1, rule2 = _endpoint_rules()
 
     def p(role: str) -> str:
         return os.path.join(d, spec.files[role])
@@ -296,8 +314,8 @@ def build_online_recognizer(spec: SherpaModelSpec, *, download: bool = True):
             provider=_PROVIDER,
             decoding_method="greedy_search",
             enable_endpoint_detection=True,
-            rule1_min_trailing_silence=2.4,
-            rule2_min_trailing_silence=1.2,
+            rule1_min_trailing_silence=rule1,
+            rule2_min_trailing_silence=rule2,
             rule3_min_utterance_length=20,
         )
     if spec.kind == "online-paraformer":
@@ -309,8 +327,8 @@ def build_online_recognizer(spec: SherpaModelSpec, *, download: bool = True):
             provider=_PROVIDER,
             decoding_method="greedy_search",
             enable_endpoint_detection=True,
-            rule1_min_trailing_silence=2.4,
-            rule2_min_trailing_silence=1.2,
+            rule1_min_trailing_silence=rule1,
+            rule2_min_trailing_silence=rule2,
             rule3_min_utterance_length=20,
         )
     raise ValueError(f"{spec.id} is not a streaming model (kind={spec.kind})")

backend/services/speaker_clone.py

@@ -42,11 +42,25 @@ IDEAL_REF_DURATION_S = 8.0  # target window — long enough for prosody, short e
 # is the empirical floor below which our zero-shot clone gets unstable.
 MIN_SEGMENT_REF_DURATION_S = 3.0
 
+# Clone-purity guards (speaker-hint fix): a per-speaker reference cut from
+# mislabeled or boundary-adjacent audio mixes two people's voices and the
+# resulting clone sounds "made up".
+#   * A slice below MIN_SLICE_DURATION_S is too short to be a reliable
+#     single-speaker sample (and diarization boundary jitter dominates it).
+#   * A slice whose edges come within ADJACENT_TURN_GUARD_S of a *different*
+#     speaker's turn risks bleeding that speaker's audio across the imprecise
+#     boundary — deprioritized (scoring preference, not a hard filter, so
+#     extraction still succeeds on dense dialogue).
+MIN_SLICE_DURATION_S = 1.5
+ADJACENT_TURN_GUARD_S = 0.3
+
 
 def extract_speaker_clones(
     vocals_path: str,
     segments: list[dict],
     out_dir: str,
+    *,
+    labels_source: str | None = None,
 ) -> dict[str, dict]:
     """Build a per-speaker reference sample from `vocals_path` + `segments`.
 
@@ -63,7 +77,20 @@ def extract_speaker_clones(
 
     Speakers whose segments total < MIN_REF_DURATION_S are skipped — we'd
     rather fall back to the default TTS voice than ship a bad clone.
+
+    ``labels_source`` records where the ``speaker_id`` labels came from
+    (``"pyannote"`` | ``"turns"`` | ``"heuristic"``; ``None`` = unknown,
+    treated as trusted for backward compatibility). ``"heuristic"`` labels
+    are silence-gap *estimates*, not voice identity — a reference cut from
+    them routinely concatenates two people's audio, so extraction is skipped
+    entirely (the caller warns the user and falls back to the default voice).
     """
+    if labels_source == "heuristic":
+        logger.info(
+            "speaker_clone: skipping auto-clone extraction — speaker labels "
+            "are gap-based heuristic estimates, not voice identity"
+        )
+        return {}
     if not vocals_path or not os.path.exists(vocals_path):
         logger.info("speaker_clone: no vocals track at %s; skipping", vocals_path)
         return {}
@@ -88,7 +115,12 @@ def extract_speaker_clones(
     out: dict[str, dict] = {}
 
     for speaker_id, items in by_speaker.items():
-        chosen = _pick_reference_slices(items)
+        chosen = _pick_reference_slices(
+            items,
+            speaker_id=speaker_id,
+            all_segments=segments,
+            labels_source=labels_source,
+        )
         if not chosen:
             logger.info(
                 "speaker_clone: %s has <%ss of usable audio; will fall back to default voice",
@@ -194,31 +226,87 @@ def extract_segment_refs(
 # ── Internals ───────────────────────────────────────────────────────────────
 
 
-def _pick_reference_slices(items: list[tuple[int, dict]]) -> list[tuple[int, dict]]:
+def _adjacent_to_other_speaker(
+    seg: dict, speaker_id: str, all_segments: list[dict] | None
+) -> bool:
+    """True when `seg`'s edges come within ADJACENT_TURN_GUARD_S of (or
+    overlap) a segment attributed to a *different* speaker — a boundary where
+    imprecise diarization timestamps risk bleeding the other voice into the
+    reference slice."""
+    if not all_segments:
+        return False
+    s0 = float(seg.get("start", 0.0))
+    s1 = float(seg.get("end", 0.0))
+    for other in all_segments:
+        if other is seg:
+            continue
+        if (other.get("speaker_id") or "Speaker 1") == speaker_id:
+            continue
+        o0 = float(other.get("start", 0.0))
+        o1 = float(other.get("end", 0.0))
+        # Signed gap between the two spans; negative = overlap.
+        if max(o0 - s1, s0 - o1) < ADJACENT_TURN_GUARD_S:
+            return True
+    return False
+
+
+def _pick_reference_slices(
+    items: list[tuple[int, dict]],
+    *,
+    speaker_id: str | None = None,
+    all_segments: list[dict] | None = None,
+    labels_source: str | None = None,
+) -> list[tuple[int, dict]]:
     """Select the subset of a speaker's segments to use as reference audio.
 
-    Strategy: take the single longest segment; if it's short, accumulate the
-    next longest ones in original order until we clear IDEAL_REF_DURATION_S.
-    Cap at MAX_REF_DURATION_S. Return [] if we can't reach MIN_REF_DURATION_S.
+    Strategy: rank candidates clean-first (not temporally adjacent to a
+    different speaker's turn — see ``_adjacent_to_other_speaker``), longest
+    first within each tier, and accumulate until IDEAL_REF_DURATION_S is
+    cleared. Adjacency is a scoring preference, NOT a hard filter — on dense
+    dialogue where every slice borders another speaker, extraction still
+    succeeds using the adjacent ones. Two hard guards protect clone purity:
+
+    * slices shorter than MIN_SLICE_DURATION_S are rejected outright
+      (boundary jitter dominates them, so they're the likeliest to carry a
+      second speaker's audio);
+    * ``labels_source="heuristic"`` returns [] — gap-based labels are not
+      voice identity, so no slice of them is safe to clone from.
+
+    Cap at MAX_REF_DURATION_S. Return [] if we can't reach
+    MIN_REF_DURATION_S. When ``all_segments``/``speaker_id`` are not
+    provided (legacy callers), adjacency scoring degrades to duration-only —
+    the pre-guard behavior.
     """
     if not items:
         return []
+    if labels_source == "heuristic":
+        return []
+    if speaker_id is None:
+        speaker_id = items[0][1].get("speaker_id") or "Speaker 1"
 
-    # Longest-first candidates. Keep original indices so we can preserve order.
-    by_dur = sorted(
+    def _dur(pair) -> float:
+        return max(0.0, float(pair[1].get("end", 0.0)) - float(pair[1].get("start", 0.0)))
+
+    # Rank: clean (non-adjacent) before adjacent, longest first within each
+    # tier. Keep original indices so we can restore transcript order below.
+    ranked = sorted(
         items,
-        key=lambda pair: (pair[1].get("end", 0.0) - pair[1].get("start", 0.0)),
-        reverse=True,
+        key=lambda pair: (
+            _adjacent_to_other_speaker(pair[1], speaker_id, all_segments),
+            -_dur(pair),
+        ),
     )
 
     picked: list[tuple[int, dict]] = []
     total = 0.0
-    for idx, seg in by_dur:
-        dur = max(0.0, float(seg.get("end", 0.0)) - float(seg.get("start", 0.0)))
-        if dur <= 0.0:
+    for idx, seg in ranked:
+        dur = _dur((idx, seg))
+        if dur < MIN_SLICE_DURATION_S:
             continue
         if total + dur > MAX_REF_DURATION_S and picked:
-            break
+            # Ranking is no longer duration-monotonic, so a later (shorter or
+            # adjacent) slice may still fit — skip, don't stop.
+            continue
         picked.append((idx, seg))
         total += dur
         if total >= IDEAL_REF_DURATION_S:

backend/services/speech_rate.py

@@ -18,9 +18,17 @@ import logging
 from typing import Iterable, Optional
 
 from services.llm_backend import get_active_llm_backend, OffBackend
+# Shared LLM-output divergence guard (length window + target-script +
+# critique-echo). Lives in translator; translator never imports this module,
+# so there is no import cycle.
+from services.translator import refine_output_ok
 
 logger = logging.getLogger("omnivoice.speech_rate")
 
+# LLM Skills registry id — Settings → LLM Skills can disable the slot-fit
+# LLM pass or route it to a specific provider. Disabled == the no-llm path.
+_SKILL_ID = "slot_fitting"
+
 # Per-language read-speed estimates (chars/sec at natural pace, counting
 # Python `len()` codepoints — not phonemes or graphemes). These are
 # rough; real speakers vary wildly. Numbers below come from a mix of
@@ -87,9 +95,15 @@ _EXPAND_PROMPT = """\
 You are a dubbing writer. The user will give you a translated line + the exact
 time slot it must fit. The current line is TOO SHORT — add natural filler or
 gently flesh out the thought while keeping the meaning the same. Aim for a
-reading duration that matches the slot.
+reading duration that matches the slot. Never invent new information, names,
+or dialogue that is not already in the line; do not more than double the line.
 Reply with ONLY the new line. No quotes, no commentary."""
 
+# Below this predicted rate ratio a line can never honestly fill its slot —
+# any LLM "expansion" that far would be fabricated dialogue. Skip the expand
+# pass entirely and keep the short line (slot-aware TTS absorbs the silence).
+_MIN_EXPANDABLE_RATIO = 0.15
+
 
 def adjust_for_slot(
     text: str,
@@ -103,19 +117,41 @@ def adjust_for_slot(
 
     Falls back to the input text if the LLM is off or the loop gives up.
 
-    ``strict`` (Autofit mode) caps the accepted upper bound at 1.0 instead of
-    ``TOL_HIGH`` — i.e. the line must fit *within* the slot, never overrun it —
-    so the target-language reading time can't exceed the segment and push the
-    video timing out. A too-short line is still accepted down to ``TOL_LOW`` (we
-    don't pad just to fill silence). Best-effort: after ``MAX_ATTEMPTS`` it
-    returns the closest candidate seen, so a stubborn line degrades gracefully.
+    ``strict`` (Autofit mode) changes exactly one thing: the accepted upper
+    bound is 1.0 instead of ``TOL_HIGH`` — the line must fit *within* the
+    slot, never overrun it — so the target-language reading time can't exceed
+    the segment and push the video timing out. Lines under ``TOL_LOW`` still
+    go through the LLM expand pass in strict mode too (same as loose mode);
+    padding is bounded by the divergence guard below, and a line under
+    ``_MIN_EXPANDABLE_RATIO`` is never expanded at all — it could only "fill"
+    the slot with fabricated dialogue, so it stays short. Best-effort: after
+    ``MAX_ATTEMPTS`` it returns the closest candidate seen, so a stubborn line
+    degrades gracefully.
+
+    Every LLM reply is validated with ``translator.refine_output_ok`` against
+    the ORIGINAL input ``text`` (not the previous candidate — divergence
+    compounds across attempts otherwise). A reply that fails the guard is
+    discarded: the attempt is burned, ``current``/``best`` stay put, and if
+    nothing valid ever came back the input text is returned with
+    ``error="fit-diverged"`` — a hallucinating model can no longer invent the
+    dub line (v0.3.9 field report).
     """
     tol_high = 1.0 if strict else TOL_HIGH
     initial_ratio = rate_ratio(text, slot_seconds, target_lang)
     if TOL_LOW <= initial_ratio <= tol_high:
         return {"text": text, "rate_ratio": initial_ratio, "attempts": 0}
+    if initial_ratio < _MIN_EXPANDABLE_RATIO:
+        return {
+            "text": text,
+            "rate_ratio": initial_ratio,
+            "attempts": 0,
+            "error": "fit-skip-short",
+        }
 
-    llm = get_active_llm_backend()
+    from services import llm_skills
+    # `active=` forwards this module's (monkeypatch-able) name so the
+    # no-override path is byte-identical to the pre-skills behavior.
+    llm = llm_skills.skill_backend(_SKILL_ID, active=lambda: get_active_llm_backend())
     if isinstance(llm, OffBackend):
         return {
             "text": text,
@@ -126,6 +162,7 @@ def adjust_for_slot(
 
     current = text
     best = (current, initial_ratio)
+    diverged = False
     for attempt in range(1, MAX_ATTEMPTS + 1):
         r = rate_ratio(current, slot_seconds, target_lang)
         if TOL_LOW <= r <= tol_high:
@@ -143,23 +180,43 @@ def adjust_for_slot(
             user_lines.append(f"Source line (for meaning): {source_text}")
 
         try:
-            next_text = llm.chat(system=system, user="\n".join(user_lines))
+            next_text = llm.chat(
+                system=system, user="\n".join(user_lines),
+                temperature=0.2,  # pinned like the Fast path — default 1.0 drifts/invents
+            )
         except Exception as e:
             logger.warning("speech-rate attempt %d failed: %s", attempt, e)
             return {"text": best[0], "rate_ratio": best[1], "attempts": attempt - 1, "error": str(e)}
 
         if next_text and next_text.strip():
-            current = next_text.strip()
+            candidate = next_text.strip()
+            # Divergence guard — validate against the ORIGINAL text, not
+            # `current`: each accepted reply becomes the next prompt's input,
+            # so per-step checks would let drift compound across attempts.
+            ok, reason = refine_output_ok(text, candidate, target_lang)
+            if not ok:
+                diverged = True
+                logger.warning(
+                    "speech-rate attempt %d rejected (%s) — discarding candidate",
+                    attempt, reason,
+                )
+                continue  # attempt burned; current/best untouched
+            current = candidate
             new_r = rate_ratio(current, slot_seconds, target_lang)
             # Keep the best candidate seen so far in case we exhaust retries.
             if abs(new_r - 1.0) < abs(best[1] - 1.0):
                 best = (current, new_r)
 
-    return {
+    out = {
         "text": best[0],
         "rate_ratio": best[1],
         "attempts": MAX_ATTEMPTS,
     }
+    # Every usable reply diverged and the input text survived unchanged —
+    # surface it on the row (rate_error in dub_translate, like fit-budget).
+    if diverged and best[0] == text:
+        out["error"] = "fit-diverged"
+    return out
 
 
 def adjust_many(pairs: Iterable[tuple[str, float, str, Optional[str]]]) -> list[dict]:
@@ -171,3 +228,78 @@ def adjust_many(pairs: Iterable[tuple[str, float, str, Optional[str]]]) -> list[
         adjust_for_slot(t, slot_seconds=s, target_lang=tl, source_text=src)
         for (t, s, tl, src) in pairs
     ]
+
+
+async def adjust_for_slot_many(
+    items: Iterable[tuple],
+    *,
+    executor=None,
+    concurrency: Optional[int] = None,
+    deadline: Optional[float] = None,
+    loop=None,
+) -> dict:
+    """Fan `adjust_for_slot` out across many segments concurrently, bounded by a
+    shared wall-clock ``deadline``.
+
+    ``items``: iterable of ``(key, text, slot_seconds, target_lang,
+    source_text_or_None, strict)``. Returns ``{key: adjust_for_slot_result}``.
+
+    Why this exists: the Autofit fit pass used to run one `adjust_for_slot` per
+    segment *sequentially* and *outside* any budget, so a 50-segment dub against
+    a slow/rate-limited LLM spun ~50×(per-call timeout) unbounded. Here every
+    segment runs on the executor under a bounded ``asyncio.Semaphore``, and any
+    segment still running when the shared ``deadline`` passes degrades to a
+    no-fit result (input text kept, predicted ``rate_ratio``, ``error`` =
+    ``"fit-budget"``) instead of hanging the translate. ``deadline`` is an
+    absolute ``loop.time()``; ``None`` disables the bound (run to completion).
+    """
+    import asyncio
+    import os
+
+    loop = loop or asyncio.get_running_loop()
+    items = list(items)
+    if not items:
+        return {}
+    sem = asyncio.Semaphore(concurrency or int(os.environ.get("OMNIVOICE_LLM_CONCURRENCY", "6")))
+
+    async def _one(key, text, slot, tgt, src, strict):
+        async with sem:
+            res = await loop.run_in_executor(
+                executor,
+                lambda: adjust_for_slot(
+                    text, slot_seconds=slot, target_lang=tgt,
+                    source_text=src, strict=strict,
+                ),
+            )
+        return key, res
+
+    def _degraded(text, slot, tgt) -> dict:
+        return {
+            "text": text,
+            "rate_ratio": rate_ratio(text, slot, tgt),
+            "attempts": 0,
+            "error": "fit-budget",
+        }
+
+    tasks = [asyncio.ensure_future(_one(*it)) for it in items]
+
+    if deadline is None:
+        pairs_out = await asyncio.gather(*tasks)
+        return dict(pairs_out)
+
+    timeout = max(0.0, deadline - loop.time())
+    done, _pending = await asyncio.wait(tasks, timeout=timeout)
+    out: dict = {}
+    for task, it in zip(tasks, items):
+        key, text, slot, tgt = it[0], it[1], it[2], it[3]
+        if task in done and not task.cancelled():
+            try:
+                k, res = task.result()
+                out[k] = res
+                continue
+            except Exception as e:  # noqa: BLE001 — one slow seg must not sink the pass
+                logger.warning("fit segment %s failed: %s", key, e)
+        else:
+            task.cancel()  # stop awaiting; the executor thread is abandoned (#730 pattern)
+        out[key] = _degraded(text, slot, tgt)
+    return out

backend/services/storage_report.py

@@ -0,0 +1,471 @@
+"""Storage usage report for Settings → Storage.
+
+Computes, for everything the app owns on disk:
+
+  * per-volume totals (total / used / free, grouped by ``st_dev`` so two
+    roots on the same disk are reported once),
+  * per-category directory sizes — the HF model cache (with the largest
+    model dirs), the app data dir (broken into voices / outputs / dub_jobs /
+    batch / preview / database / logs / other subtotals), the per-engine
+    venvs under ``backend/engines/*/.venv`` (+ the app venv), and any
+    ``omnivoice*`` entries in the OS temp dir,
+  * server-side ``warnings`` (low disk, volume pressure, unreadable paths)
+    so every client renders the same guidance.
+
+Directory walks are **bounded**: each top-level category gets a deadline
+(default 10 s) and returns a partial total (``complete: false`` + an
+``unreadable`` warning with ``reason: "timeout"``) when it expires. Results
+are cached in-process for 5 minutes; ``refresh`` bypasses the cache. The API
+layer runs the whole build in a worker thread so the event loop never blocks.
+"""
+from __future__ import annotations
+
+import glob
+import os
+import shutil
+import sys
+import tempfile
+import threading
+import time
+from pathlib import Path
+
+CACHE_TTL_SECONDS = 300.0
+CATEGORY_TIMEOUT_SECONDS = 10.0
+TOP_MODEL_COUNT = 10
+VOLUME_PRESSURE_PERCENT = 90.0
+DEFAULT_MIN_FREE_GB = 10  # callers pass setup.wizard.MIN_FREE_GB — this is the standalone fallback
+
+# DATA_DIR children we know by name (core.config constants + routers that
+# write there). Anything else lands in the "other" subtotal so the numbers
+# always add up to the real on-disk footprint.
+_DATA_CHILD_DIRS = ("voices", "outputs", "dub_jobs", "batch", "preview")
+_DB_PREFIX = "omnivoice.db"          # omnivoice.db + -wal / -shm / -journal
+_LOG_FILES = ("crash_log.txt", "error_journal.jsonl")
+_LOG_PREFIX = "omnivoice.log"        # rolling log + rotations
+
+_GB = 1024 ** 3
+
+
+def default_engines_dir() -> str:
+    """``backend/engines`` — where per-engine venvs live (`<id>/.venv`)."""
+    return str(Path(__file__).resolve().parents[1] / "engines")
+
+
+def default_app_venv() -> str | None:
+    """The venv this backend runs from, when it is one (None for system python)."""
+    if sys.prefix != getattr(sys, "base_prefix", sys.prefix):
+        return sys.prefix
+    return None
+
+
+def _existing_ancestor(path: str) -> str:
+    """Deepest existing ancestor of ``path`` (for disk_usage on missing dirs)."""
+    p = os.path.abspath(path)
+    while p and not os.path.exists(p):
+        parent = os.path.dirname(p)
+        if parent == p:
+            break
+        p = parent
+    return p
+
+
+def _mount_point(path: str) -> str:
+    """Mount point of the volume holding ``path`` (best-effort, cheap)."""
+    p = _existing_ancestor(path)
+    try:
+        while p and not os.path.ismount(p):
+            parent = os.path.dirname(p)
+            if parent == p:
+                break
+            p = parent
+    except OSError:
+        pass
+    return p or os.path.abspath(os.sep)
+
+
+def _dir_size(path: str, deadline: float) -> tuple[int, bool, str | None]:
+    """du-style size of ``path``: ``(bytes, complete, first_unreadable_path)``.
+
+    Never follows symlinks (lstat + walk default), never raises. Stops early
+    and reports ``complete=False`` once ``deadline`` (time.monotonic) passes.
+    """
+    err_path: str | None = None
+
+    def _onerror(e: OSError) -> None:
+        nonlocal err_path
+        if err_path is None:
+            err_path = getattr(e, "filename", None) or path
+
+    try:
+        if not os.path.exists(path):
+            return 0, True, None
+        if not os.path.isdir(path):
+            return os.lstat(path).st_size, True, None
+    except OSError:
+        return 0, True, path
+
+    total = 0
+    complete = True
+    for root, _dirs, files in os.walk(path, onerror=_onerror):
+        if time.monotonic() > deadline:
+            complete = False
+            break
+        for name in files:
+            fp = os.path.join(root, name)
+            try:
+                total += os.lstat(fp).st_size
+            except OSError:
+                if err_path is None:
+                    err_path = fp
+    return total, complete, err_path
+
+
+def _sum_files(paths: list[str]) -> int:
+    total = 0
+    for p in paths:
+        try:
+            total += os.lstat(p).st_size
+        except OSError:
+            pass
+    return total
+
+
+def _hf_model_dirs(cache_dir: str) -> list[str]:
+    """`models--org--name` dirs in the cache root and its `hub/` child.
+
+    HF_HUB_CACHE points straight at the hub dir; HF_HOME needs `/hub`
+    appended — scanning both covers either env resolution.
+    """
+    out: list[str] = []
+    for base in (cache_dir, os.path.join(cache_dir, "hub")):
+        try:
+            with os.scandir(base) as it:
+                out.extend(
+                    e.path for e in it
+                    if e.name.startswith("models--") and e.is_dir(follow_symlinks=False)
+                )
+        except OSError:
+            continue
+    return out
+
+
+def _model_display_name(dir_name: str) -> str:
+    return dir_name.removeprefix("models--").replace("--", "/")
+
+
+def build_report(
+    *,
+    data_dir: str,
+    hf_cache_dir: str,
+    engines_dir: str | None = None,
+    app_venv: str | None = None,
+    temp_root: str | None = None,
+    min_free_gb: float = DEFAULT_MIN_FREE_GB,
+    category_timeout: float = CATEGORY_TIMEOUT_SECONDS,
+) -> dict:
+    """Build the full storage report (synchronous; call from a worker thread)."""
+    engines_dir = engines_dir if engines_dir is not None else default_engines_dir()
+    temp_root = temp_root if temp_root is not None else tempfile.gettempdir()
+    warnings: list[dict] = []
+    categories: list[dict] = []
+
+    def _warn_unreadable(category_id: str, path: str, reason: str) -> None:
+        warnings.append({
+            "kind": "unreadable",
+            "severity": "warning",
+            "category_id": category_id,
+            "path": path,
+            "reason": reason,
+        })
+
+    def _finish(category_id: str, cat: dict, complete: bool, err_path: str | None) -> None:
+        cat["complete"] = complete
+        if not complete:
+            _warn_unreadable(category_id, cat["path"], "timeout")
+        if err_path is not None:
+            _warn_unreadable(category_id, err_path, "permission")
+
+    # ── 1. HF model cache (+ top model dirs) ───────────────────────────────
+    deadline = time.monotonic() + category_timeout
+    hf_total = 0
+    hf_complete = True
+    hf_err: str | None = None
+    models: list[dict] = []
+    model_dirs = set(_hf_model_dirs(hf_cache_dir))
+    seen: set[str] = set()
+    for mdir in sorted(model_dirs):
+        size, ok, err = _dir_size(mdir, deadline)
+        hf_total += size
+        hf_complete = hf_complete and ok
+        hf_err = hf_err or err
+        models.append({"name": _model_display_name(os.path.basename(mdir)), "bytes": size})
+        seen.add(os.path.realpath(mdir))
+    # Non-model remainder of the cache (datasets, xet chunks, token file, …):
+    # walk the top-level entries that aren't model dirs so the category total
+    # reflects the whole cache, not just models.
+    try:
+        with os.scandir(hf_cache_dir) as it:
+            entries = list(it)
+    except OSError:
+        entries = []
+        if os.path.exists(hf_cache_dir):
+            hf_err = hf_err or hf_cache_dir
+    for e in entries:
+        if os.path.realpath(e.path) in seen:
+            continue
+        if e.name == "hub":
+            # hub/ holds the model dirs (already counted) + misc; count the rest.
+            try:
+                with os.scandir(e.path) as hub_it:
+                    for h in hub_it:
+                        if os.path.realpath(h.path) in seen:
+                            continue
+                        size, ok, err = _dir_size(h.path, deadline)
+                        hf_total += size
+                        hf_complete = hf_complete and ok
+                        hf_err = hf_err or err
+            except OSError:
+                hf_err = hf_err or e.path
+            continue
+        size, ok, err = _dir_size(e.path, deadline)
+        hf_total += size
+        hf_complete = hf_complete and ok
+        hf_err = hf_err or err
+    models.sort(key=lambda m: m["bytes"], reverse=True)
+    hf_cat = {
+        "id": "hf_cache",
+        "path": hf_cache_dir,
+        "exists": os.path.isdir(hf_cache_dir),
+        "bytes": hf_total,
+        "items": models[:TOP_MODEL_COUNT],
+    }
+    _finish("hf_cache", hf_cat, hf_complete, hf_err)
+    categories.append(hf_cat)
+
+    # ── 2. App data dir, broken into subtotals ─────────────────────────────
+    deadline = time.monotonic() + category_timeout
+    data_complete = True
+    data_err: str | None = None
+    children: list[dict] = []
+    claimed: set[str] = set()
+
+    for name in _DATA_CHILD_DIRS:
+        p = os.path.join(data_dir, name)
+        size, ok, err = _dir_size(p, deadline)
+        data_complete = data_complete and ok
+        data_err = data_err or err
+        claimed.add(name)
+        children.append({"id": name, "path": p, "bytes": size, "complete": ok})
+
+    db_files = sorted(glob.glob(os.path.join(glob.escape(data_dir), _DB_PREFIX + "*")))
+    claimed.update(os.path.basename(p) for p in db_files)
+    children.append({
+        "id": "database",
+        "path": os.path.join(data_dir, _DB_PREFIX),
+        "bytes": _sum_files(db_files),
+        "complete": True,
+    })
+
+    log_files = sorted(glob.glob(os.path.join(glob.escape(data_dir), _LOG_PREFIX + "*")))
+    log_files += [os.path.join(data_dir, n) for n in _LOG_FILES]
+    claimed.update(os.path.basename(p) for p in log_files)
+    children.append({
+        "id": "logs",
+        "path": data_dir,
+        "bytes": _sum_files(log_files),
+        "complete": True,
+    })
+
+    other_bytes = 0
+    try:
+        with os.scandir(data_dir) as it:
+            for e in it:
+                if e.name in claimed:
+                    continue
+                if e.is_dir(follow_symlinks=False):
+                    size, ok, err = _dir_size(e.path, deadline)
+                    other_bytes += size
+                    data_complete = data_complete and ok
+                    data_err = data_err or err
+                else:
+                    try:
+                        other_bytes += e.stat(follow_symlinks=False).st_size
+                    except OSError:
+                        data_err = data_err or e.path
+    except OSError:
+        if os.path.exists(data_dir):
+            data_err = data_err or data_dir
+    children.append({"id": "other", "path": data_dir, "bytes": other_bytes, "complete": True})
+
+    data_cat = {
+        "id": "data",
+        "path": data_dir,
+        "exists": os.path.isdir(data_dir),
+        "bytes": sum(c["bytes"] for c in children),
+        "children": children,
+    }
+    _finish("data", data_cat, data_complete, data_err)
+    categories.append(data_cat)
+
+    # ── 3. Engine venvs (+ the app venv) ───────────────────────────────────
+    deadline = time.monotonic() + category_timeout
+    venv_total = 0
+    venv_complete = True
+    venv_err: str | None = None
+    venv_items: list[dict] = []
+    try:
+        with os.scandir(engines_dir) as it:
+            engine_dirs = sorted(e.path for e in it if e.is_dir(follow_symlinks=False))
+    except OSError:
+        engine_dirs = []
+    for edir in engine_dirs:
+        venv_dir = os.path.join(edir, ".venv")
+        if not os.path.isdir(venv_dir):
+            continue
+        size, ok, err = _dir_size(venv_dir, deadline)
+        venv_total += size
+        venv_complete = venv_complete and ok
+        venv_err = venv_err or err
+        venv_items.append({"name": os.path.basename(edir), "bytes": size})
+    if app_venv:
+        size, ok, err = _dir_size(app_venv, deadline)
+        venv_total += size
+        venv_complete = venv_complete and ok
+        venv_err = venv_err or err
+        venv_items.append({"name": "app", "bytes": size})
+    venv_items.sort(key=lambda m: m["bytes"], reverse=True)
+    venv_cat = {
+        "id": "engine_venvs",
+        "path": engines_dir,
+        "exists": os.path.isdir(engines_dir),
+        "bytes": venv_total,
+        "items": venv_items,
+    }
+    _finish("engine_venvs", venv_cat, venv_complete, venv_err)
+    categories.append(venv_cat)
+
+    # ── 4. Temp/working files the app owns (omnivoice* in the OS temp dir) ─
+    deadline = time.monotonic() + category_timeout
+    tmp_total = 0
+    tmp_complete = True
+    tmp_err: str | None = None
+    for p in sorted(glob.glob(os.path.join(glob.escape(temp_root), "omnivoice*"))):
+        size, ok, err = _dir_size(p, deadline)
+        tmp_total += size
+        tmp_complete = tmp_complete and ok
+        tmp_err = tmp_err or err
+    tmp_cat = {
+        "id": "temp",
+        "path": temp_root,
+        "exists": os.path.isdir(temp_root),
+        "bytes": tmp_total,
+        "items": [],
+    }
+    _finish("temp", tmp_cat, tmp_complete, tmp_err)
+    categories.append(tmp_cat)
+
+    # ── Volumes: group category roots by device, disk_usage once each ──────
+    roots = {"hf_cache": hf_cache_dir, "data": data_dir, "engine_venvs": engines_dir, "temp": temp_root}
+    by_dev: dict[object, dict] = {}
+    for cid, root in roots.items():
+        anchor = _existing_ancestor(root)
+        try:
+            dev: object = os.stat(anchor).st_dev
+        except OSError:
+            dev = anchor
+        if dev not in by_dev:
+            try:
+                usage = shutil.disk_usage(anchor)
+            except OSError:
+                continue
+            by_dev[dev] = {
+                "path": _mount_point(anchor),
+                "total_bytes": usage.total,
+                "used_bytes": usage.used,
+                "free_bytes": usage.free,
+                "used_percent": round(usage.used / usage.total * 100.0, 1) if usage.total else 0.0,
+                "roots": [],
+            }
+        by_dev[dev]["roots"].append(cid)
+    volumes = list(by_dev.values())
+
+    # ── Server-side warnings ────────────────────────────────────────────────
+    for v in volumes:
+        free_gb = v["free_bytes"] / _GB
+        base = {
+            "path": v["path"],
+            "free_gb": round(free_gb, 1),
+            "min_free_gb": min_free_gb,
+            "roots": v["roots"],
+        }
+        if free_gb < min_free_gb:
+            warnings.append({"kind": "low_disk", "severity": "critical", **base})
+        elif free_gb < 2 * min_free_gb:
+            warnings.append({"kind": "low_disk", "severity": "low", **base})
+        if v["used_percent"] > VOLUME_PRESSURE_PERCENT and ({"hf_cache", "data"} & set(v["roots"])):
+            warnings.append({
+                "kind": "volume_pressure",
+                "severity": "warning",
+                "path": v["path"],
+                "used_percent": v["used_percent"],
+                "roots": v["roots"],
+            })
+
+    # Order: critical first, then the rest in computed order (stable sort).
+    warnings.sort(key=lambda w: 0 if w["severity"] == "critical" else 1)
+
+    return {
+        "generated_at": time.time(),
+        "min_free_gb": min_free_gb,
+        "volumes": volumes,
+        "categories": categories,
+        "warnings": warnings,
+    }
+
+
+# ── In-process cache (5-minute TTL, refresh bypasses) ──────────────────────
+_cache_lock = threading.Lock()
+_cache: dict = {"key": None, "ts": 0.0, "report": None}
+
+
+def get_report(
+    *,
+    data_dir: str,
+    hf_cache_dir: str,
+    engines_dir: str | None = None,
+    app_venv: str | None = None,
+    temp_root: str | None = None,
+    min_free_gb: float = DEFAULT_MIN_FREE_GB,
+    category_timeout: float = CATEGORY_TIMEOUT_SECONDS,
+    refresh: bool = False,
+    ttl: float = CACHE_TTL_SECONDS,
+) -> dict:
+    """Cached ``build_report``. ``refresh=True`` forces a rescan."""
+    key = (data_dir, hf_cache_dir, engines_dir, app_venv, temp_root, min_free_gb)
+    if not refresh:
+        with _cache_lock:
+            fresh = (
+                _cache["report"] is not None
+                and _cache["key"] == key
+                and (time.monotonic() - _cache["ts"]) < ttl
+            )
+            if fresh:
+                return {**_cache["report"], "cached": True}
+    report = build_report(
+        data_dir=data_dir,
+        hf_cache_dir=hf_cache_dir,
+        engines_dir=engines_dir,
+        app_venv=app_venv,
+        temp_root=temp_root,
+        min_free_gb=min_free_gb,
+        category_timeout=category_timeout,
+    )
+    with _cache_lock:
+        _cache.update(key=key, ts=time.monotonic(), report=report)
+    return {**report, "cached": False}
+
+
+def clear_cache() -> None:
+    """Testing hook — drop the in-process cache."""
+    with _cache_lock:
+        _cache.update(key=None, ts=0.0, report=None)

backend/services/subprocess_asr.py

@@ -132,6 +132,10 @@ class IsolatedFasterWhisperBackend(SubprocessASRBackend):
 
     id = "faster-whisper-isolated"
     display_name = "Faster-Whisper (crash-isolated subprocess)"
+    # Same engine as FasterWhisperBackend, so the same device support — the
+    # sidecar picks cuda/cpu itself via `_device()`. Without this the registry
+    # default ("cpu",) would dishonestly report cpu_only routing on CUDA hosts.
+    gpu_compat = ("cuda", "cpu")
 
     @classmethod
     def is_available(cls) -> tuple[bool, str]:

backend/services/text_polish.py

@@ -0,0 +1,79 @@
+"""
+Deterministic polish for dictation finals (dictation v2).
+
+Every ``final`` that leaves ``/ws/transcribe`` passes through
+:func:`polish_text` so pasted dictation reads like typed text:
+
+  * leading capital -- Latin scripts only (CJK/Cyrillic/etc. untouched),
+  * terminal punctuation -- a period is appended unless the text already
+    ends with sentence-terminal punctuation (incl. the CJK fullwidth forms),
+  * doubled spaces collapsed, leading/trailing whitespace stripped.
+
+Purely rule-based -- no model, no locale detection, no network -- so it is
+byte-for-byte reproducible and idempotent (``polish(polish(x)) == polish(x)``).
+
+CJK codepoints below are ``\\u``-escaped on purpose: this is functional
+punctuation handling (allowed), and the escapes keep this file outside the
+literal-CJK scan in ``tests/test_no_hardcoded_cjk.py`` without growing its
+allowlist.
+"""
+from __future__ import annotations
+
+import re
+
+# Sentence-terminal punctuation that already "closes" a final -- Latin plus
+# the CJK fullwidth forms (U+3002 ideographic full stop, U+FF01 !, U+FF1F ?)
+# and ellipsis. A trailing closing quote/bracket after one of these still
+# counts as terminated ("He said \"hi.\"").
+_TERMINAL = ".!?\u2026\u3002\uff01\uff1f"
+_CLOSERS = "\"'\u201d\u2019\u00bb\u203a)]}\u300d\u300f\uff09\u3011"
+
+# A dangling clause separator at the very end (ASR often stops mid-breath on
+# a comma) is swapped for a stop instead of stacking ",." punctuation.
+# Latin , ; : plus the CJK forms U+3001 U+FF0C U+FF1B U+FF1A.
+_DANGLING = ",;:\u3001\uff0c\uff1b\uff1a"
+
+# CJK codepoints (kana, unified ideographs, compatibility + halfwidth forms)
+# -- used to pick the fullwidth stop U+3002 over "." for CJK sentences.
+_CJK = re.compile(
+    "[\u3040-\u30ff\u3400-\u4dbf\u4e00-\u9fff\uf900-\ufaff\uff66-\uff9f]"
+)
+
+_MULTISPACE = re.compile(r"[ \t]{2,}")
+
+
+def _is_latin_lower(ch: str) -> bool:
+    """Lowercase letter in a Latin block (ASCII, Latin-1, Latin Extended-A/B).
+
+    Capitalization is meaningless (CJK) or presumptuous (Cyrillic, Greek --
+    the model's casing is trusted) outside Latin scripts.
+    """
+    return ch.islower() and ord(ch) <= 0x024F
+
+
+def polish_text(text: str) -> str:
+    """Normalise one dictation final. Empty/whitespace-only input -> ``""``."""
+    if not text:
+        return ""
+    out = _MULTISPACE.sub(" ", text).strip()
+    if not out:
+        return ""
+
+    # Leading capital (Latin scripts only).
+    if _is_latin_lower(out[0]):
+        out = out[0].upper() + out[1:]
+
+    # Already terminated -- possibly behind a closing quote/bracket?
+    body = out.rstrip(_CLOSERS)
+    if body and body[-1] in _TERMINAL:
+        return out
+
+    # Swap a dangling comma/colon for the stop instead of stacking ",.".
+    if out[-1] in _DANGLING:
+        out = out[:-1].rstrip()
+        if not out:
+            return ""
+
+    # Script-matched stop: fullwidth U+3002 when the sentence ends in CJK.
+    out += "\u3002" if _CJK.search(out[-1]) else "."
+    return out

backend/services/translation_engines.py

@@ -92,9 +92,11 @@ REGISTRY: dict[str, dict] = {
         "category": "llm",
         "needs_key": True,
         "notes": (
-            "Any OpenAI-compatible endpoint: GPT-4/5 (OpenAI), Claude (via OpenRouter), "
-            "Gemini (OpenAI-compat mode), DeepSeek, Qwen, Ollama, LM Studio. "
-            "Set TRANSLATE_BASE_URL + TRANSLATE_API_KEY + TRANSLATE_MODEL."
+            "Uses the LLM provider you configure in Settings → LLM Providers "
+            "(route it via the 'Dub translation' skill in Settings → LLM Skills): "
+            "GPT (OpenAI), Claude (via OpenRouter), Gemini, DeepSeek, Qwen, "
+            "Ollama, LM Studio. Power-user env override: TRANSLATE_BASE_URL + "
+            "TRANSLATE_API_KEY + TRANSLATE_MODEL."
         ),
     },
 }
@@ -137,17 +139,45 @@ def install_command(engine: "str | dict | None") -> str | None:
     return f"uv pip install {pkg}" if pkg else None
 
 
+def _llm_configured() -> tuple[bool, "str | None"]:
+    """Whether the LLM translation engine has something to call, and via what.
+
+    Resolution mirrors the translate-time path in dub_translate.py: the
+    "dub_translation" LLM skill (per-skill override → active provider from
+    Settings → LLM Providers) first, then the TRANSLATE_* env override. Lets
+    the Engine dropdown say "ready via <provider>" / "needs setup" up front
+    instead of a per-segment failure after the user clicks Translate.
+    """
+    try:
+        from services import llm_skills
+        res = llm_skills.resolve_skill("dub_translation")
+        if res.ready and res.provider is not None:
+            return True, res.provider.display_name
+    except Exception:  # noqa: BLE001 — a probe must never break list_engines()
+        logger.debug("dub_translation skill probe failed", exc_info=True)
+    if os.environ.get("TRANSLATE_BASE_URL") or os.environ.get("TRANSLATE_API_KEY"):
+        return True, "env"
+    return False, None
+
+
 def list_engines() -> list[dict]:
     """Return a UI-ready list with per-engine availability stamped in."""
     out = []
     for e in REGISTRY.values():
         installed, reason = _probe(e)
-        out.append({
+        entry = {
             **e,
             "installed": installed,
             "availability_reason": reason,
             "install_command": install_command(e),
-        })
+        }
+        # LLM engines additionally need a provider/key — surface configured-ness
+        # so the UI can distinguish "importable" from "actually ready to call".
+        if e.get("category") == "llm":
+            configured, via = _llm_configured()
+            entry["configured"] = configured
+            entry["configured_via"] = via
+        out.append(entry)
     return out
 
 

backend/services/translator.py

@@ -59,8 +59,9 @@ _ADAPT_PROMPT = """\
 You are a cinematic dubbing writer. Rewrite the literal translation using the
 editor's critique so it sounds natural, in-character, and fits the speaker's
 time slot. Keep meaning faithful but prefer native idiom over word-for-word
-accuracy. The output MUST be written in the same target language and script
-as the literal translation — never switch language or transliterate.
+accuracy. Never introduce facts, names, or dialogue that are not present in
+the source line. The output MUST be written in the same target language and
+script as the literal translation — never switch language or transliterate.
 Reply ONLY with the adapted translation — no quotes, no headers, no code
 fences, no commentary."""
 
@@ -93,38 +94,136 @@ def _looks_like_target_script(text: str, code: str, threshold: float = 0.5) -> b
     return (inside / len(letters)) >= threshold
 
 
-def _llm_client():
-    """Lazy-build the OpenAI-compatible client for the ACTIVE LLM provider.
+# ── Divergence guard (shared with speech_rate's Autofit fit pass) ────────────
+# For every Latin-script target `_looks_like_target_script` passes ANY text
+# unconditionally (no `_SCRIPT_RANGES` entry), so it was the only — and for
+# es/de/fr/… a no-op — gate on the ADAPT/fit LLM output. These checks close
+# that gap for the whole class: runaway length (hallucinated dialogue,
+# refusals, commentary) and the REFLECT critique echoed back as the "line".
 
-    Resolves through the LLM Providers registry (Settings → LLM Providers) so a
-    provider configured there actually powers Cinematic/Autofit — previously this
-    only read ``TRANSLATE_*``/``OPENAI_*`` directly, so the registry-configured
-    provider was ignored (the "LLM not wired" bug). The registry's ``custom``
-    provider still maps ``TRANSLATE_BASE_URL``/``TRANSLATE_API_KEY``, so legacy
-    env setups keep working. Returns None if no provider is configured.
-    """
+_SHORT_REF_CHARS = 20        # below this, a length *ratio* is meaningless
+_SHORT_REF_ABS_SLACK = 120   # …use an absolute cap instead: ref + this many chars
+
+
+def _refine_ratio_bounds() -> tuple[float, float]:
+    """Accepted ``len(candidate)/len(reference)`` window for LLM refine output.
+    Anything outside is treated as divergence and the caller degrades to its
+    input text. Defaults [0.4, 2.5]; env-tunable like the cinematic budget."""
     try:
-        from openai import OpenAI
-    except ImportError:
-        logger.warning("openai package not installed — cinematic mode unavailable.")
-        return None
-    from services import llm_providers
-    p = llm_providers.active_provider()
-    if p is None:
-        return None
-    base_url = llm_providers.resolve_base_url(p)
-    api_key = llm_providers.resolve_api_key(p)
-    if not api_key:
-        return None
-    kw = {"api_key": api_key}
-    if base_url:
-        kw["base_url"] = base_url
-    return OpenAI(**kw)
+        lo = float(os.environ.get("OMNIVOICE_REFINE_RATIO_MIN", "0.4"))
+    except ValueError:
+        lo = 0.4
+    try:
+        hi = float(os.environ.get("OMNIVOICE_REFINE_RATIO_MAX", "2.5"))
+    except ValueError:
+        hi = 2.5
+    return lo, hi
+
+
+def _norm_overlap_text(s: str) -> str:
+    return " ".join(s.lower().split())
+
+
+def _echoes_critique(candidate: str, critique: str) -> bool:
+    """True when the "adaptation" is really the REFLECT critique leaking through.
+
+    Deterministic on purpose (no fuzzy matching): exact match after
+    case/whitespace normalization; containment — the full critique inside the
+    candidate always counts, the candidate inside the critique only when it
+    covers most of it (critiques legitimately quote short phrases from the
+    line); or >0.8 token-set overlap.
+    """
+    c = _norm_overlap_text(candidate)
+    k = _norm_overlap_text(critique)
+    if not c or not k:
+        return False
+    if c == k:
+        return True
+    if k in c:                                  # critique embedded in the output
+        return True
+    if c in k and len(c) >= 0.6 * len(k):       # output ≈ a big chunk of the critique
+        return True
+    ct, kt = set(c.split()), set(k.split())
+    union = ct | kt
+    return bool(union) and len(ct & kt) / len(union) > 0.8
+
+
+def refine_output_ok(
+    reference: str,
+    candidate: str,
+    target_lang: str,
+    *,
+    critique: str | None = None,
+    max_ratio: float | None = None,
+) -> tuple[bool, str | None]:
+    """Sanity-check one LLM refine output against the text it was rewriting.
+
+    Shared by the Cinematic ADAPT step here and by ``speech_rate``'s Autofit
+    fit pass (speech_rate imports this; translator never imports speech_rate,
+    so there is no cycle). Returns ``(ok, reason)`` — ``reason`` is ``None``
+    when ok, otherwise a short machine-readable tag for logs/error mapping.
+
+    Checks, in order:
+      • script — candidate must look like the target language's script
+        (``_looks_like_target_script``; Latin-script targets pass, as before);
+      • length — ``len(candidate)/len(reference)`` must sit inside
+        [``OMNIVOICE_REFINE_RATIO_MIN``, ``OMNIVOICE_REFINE_RATIO_MAX``]
+        (default 0.4–2.5; ``max_ratio`` overrides the upper bound). References
+        shorter than ~20 chars use an absolute cap (reference + 120 chars)
+        instead — a two-word line legitimately doubles or halves;
+      • critique echo — the candidate must not be the critique itself.
+    """
+    cand = (candidate or "").strip()
+    ref = (reference or "").strip()
+    if not cand:
+        return False, "empty"
+    if not _looks_like_target_script(cand, target_lang):
+        return False, f"wrong-script:{target_lang}"
+    lo, hi = _refine_ratio_bounds()
+    if max_ratio is not None:
+        hi = max_ratio
+    if ref:
+        if len(ref) < _SHORT_REF_CHARS:
+            if len(cand) > len(ref) + _SHORT_REF_ABS_SLACK:
+                return False, f"length-abs:{len(cand)}>{len(ref)}+{_SHORT_REF_ABS_SLACK}"
+        else:
+            ratio = len(cand) / len(ref)
+            if not (lo <= ratio <= hi):
+                return False, f"length-ratio:{ratio:.2f}"
+    if critique and _echoes_critique(cand, critique):
+        return False, "critique-echo"
+    return True, None
+
+
+# The LLM Skills registry entry this pipeline resolves through — lets the
+# user disable Cinematic/Autofit's LLM use or route it to a specific provider
+# (Settings → LLM Skills) independently of the other LLM features.
+_SKILL_ID = "cinematic_translation"
+
+
+def _llm_client():
+    """Lazy-build the OpenAI-compatible client for the Cinematic skill.
+
+    Resolves through the LLM Skills registry: per-skill provider override →
+    global active provider (Settings → LLM Providers). The registry's
+    ``custom`` provider still maps ``TRANSLATE_BASE_URL``/``TRANSLATE_API_KEY``,
+    so legacy env setups keep working. Returns None if the skill is disabled
+    or no provider is configured — the callers' Fast-fallback path.
+
+    The registry builds the client with ``max_retries=0`` (see
+    ``llm_skills.resolve_skill_client``) so a 429 + long Retry-After can't make
+    one call sleep+retry past the cinematic wall-clock budget from inside a
+    single request. The pass-level budget (``cinematic_refine_many``) and the
+    per-call timeout stay the only bounds.
+    """
+    from services import llm_skills
+    handle = llm_skills.resolve_skill_client(_SKILL_ID)
+    return handle.client if handle is not None else None
 
 
 def _llm_model() -> str:
-    from services import llm_providers
-    p = llm_providers.active_provider()
+    from services import llm_providers, llm_skills
+    p = llm_skills.effective_provider(_SKILL_ID)
     if p is not None:
         return llm_providers.resolve_model(p)
     return os.environ.get("TRANSLATE_MODEL", "gpt-4o-mini")
@@ -176,6 +275,7 @@ def _chat(client, *, system: str, user: str) -> str:
     res = client.chat.completions.create(
         model=_llm_model(),
         timeout=_llm_timeout(),
+        temperature=0.2,  # pinned like the Fast path — default 1.0 drifts/invents
         messages=[
             {"role": "system", "content": system},
             {"role": "user", "content": user},
@@ -277,21 +377,28 @@ def cinematic_refine_sync(
         }
 
     final = (adapted or "").strip() or literal_text
-    # Refuse adaptations that drifted off the target script (e.g. local LLM
-    # rewrote a Devanagari line in Latin/German). Caller still gets the
-    # critique so the UI can show what happened, but the live text falls
-    # back to the literal translation rather than corrupting the dub.
-    if final is not literal_text and not _looks_like_target_script(final, target_lang):
-        logger.warning(
-            "cinematic adapt produced wrong-script output for %s — falling back to literal",
-            target_lang,
-        )
-        return {
-            "text": literal_text,
-            "literal": literal_text,
-            "critique": critique,
-            "error": f"adapt-wrong-script:{target_lang}",
-        }
+    # Refuse adaptations that diverged from the line they were rewriting:
+    # wrong script (e.g. a local LLM rewrote a Devanagari line in
+    # Latin/German), runaway length (hallucinated dialogue, refusals,
+    # commentary — the script check alone passes ANY text for Latin-script
+    # targets), or the critique echoed back as the "adaptation". Caller still
+    # gets the critique so the UI can show what happened, but the live text
+    # falls back to the literal translation rather than corrupting the dub.
+    if final is not literal_text:
+        ok, reason = refine_output_ok(literal_text, final, target_lang, critique=critique)
+        if not ok:
+            logger.warning(
+                "cinematic adapt diverged for %s (%s) — falling back to literal",
+                target_lang, reason,
+            )
+            wrong_script = (reason or "").startswith("wrong-script")
+            return {
+                "text": literal_text,
+                "literal": literal_text,
+                "critique": critique,
+                "error": (f"adapt-wrong-script:{target_lang}" if wrong_script
+                          else "adapt-diverged"),
+            }
     return {
         "text": final,
         "literal": literal_text,

backend/services/tts_backend.py

@@ -55,6 +55,59 @@ def _mask_hf_tokens(value):
     return _HF_TOKEN_MASK_RE.sub(_HF_TOKEN_MASK, value)
 
 
+# ── HF Hub closed-client recovery (#880) ────────────────────────────────────
+#
+# huggingface_hub ≥1.x shares ONE global httpx client across every download.
+# If anything closes it mid-lifecycle, every later hub call — e.g. an engine's
+# first-use model download inside the generate path — dies with httpx's
+# "Cannot send a request, as the client has been closed". The client is
+# recoverable: ``close_session()`` drops it and the next hub call builds a
+# fresh one, so the correct handling is a single targeted retry, not a
+# user-facing failure.
+
+
+def _is_closed_client_error(e) -> bool:
+    """True iff ``e`` (or anything in its __cause__/__context__ chain) is
+    httpx's closed-client lifecycle error. Cycle-safe."""
+    seen, stack = set(), [e]
+    while stack:
+        exc = stack.pop()
+        if exc is None or id(exc) in seen:
+            continue
+        seen.add(id(exc))
+        low = str(exc).lower()
+        if "client has been closed" in low or "cannot send a request" in low:
+            return True
+        stack.append(exc.__cause__)
+        stack.append(exc.__context__)
+    return False
+
+
+def _retry_once_with_fresh_hf_client(loader, what: str):
+    """Run ``loader()`` — a model constructor that may download from the HF
+    Hub on first use. On the specific closed-client failure above, reset the
+    hub's shared client and retry exactly ONCE. Any other failure (and a
+    repeat closed-client failure) propagates untouched, where the generation
+    error classifier labels it as a network problem (#880)."""
+    try:
+        return loader()
+    except Exception as e:
+        if not _is_closed_client_error(e):
+            raise
+        logger.warning(
+            "%s: HF Hub httpx client was closed mid-download (%s); "
+            "retrying once with a fresh client.", what, e,
+        )
+        try:
+            from huggingface_hub.utils import close_session
+            close_session()
+        except Exception:  # pragma: no cover — hub too old / API renamed
+            logger.warning(
+                "%s: couldn't reset the HF Hub client; retrying anyway.", what,
+            )
+        return loader()
+
+
 # ── Protocol ────────────────────────────────────────────────────────────────
 
 
@@ -90,12 +143,19 @@ class TTSBackend(ABC):
     supports_voice_design: bool = False
 
     #: Whether this engine already emits mastered, studio-grade audio and should
-    #: therefore skip the shared apply_mastering() chain (Compressor + Reverb,
+    #: therefore skip the shared apply_mastering() chain (highpass + Compressor,
     #: tuned for OmniVoice's 24 kHz output). Studio engines like VoxCPM2 (native
-    #: 48 kHz) set this True so their clean output isn't pumped/reverbed. Loudness
+    #: 48 kHz) set this True so their clean output isn't pumped. Loudness
     #: normalisation is applied regardless — it's a benign peak scale.
     applies_own_mastering: bool = False
 
+    #: Whether this engine can clone an arbitrary voice from reference audio
+    #: (`ref_audio=`), as opposed to only offering a fixed set of preset
+    #: voices. Default True — most engines clone. Dub/batch gate on this
+    #: (issue #312 class) before committing to a job that needs it, instead
+    #: of silently falling back to OmniVoice or mis-cloning per segment.
+    supports_cloning: bool = True
+
     #: GPU/accelerator targets the engine can run on. Surfaced via the
     #: Engine Compatibility Matrix (Plan 02-04 / ENGINE-06) so users can
     #: tell at a glance which engines will use their hardware. Defaults to
@@ -550,6 +610,7 @@ class KittenTTSBackend(TTSBackend):
     display_name = "KittenTTS (English, 8 preset voices, CPU realtime)"
     # KittenTTS ships as an ONNX CPU graph; no CUDA/MPS path today.
     gpu_compat = ("cpu",)
+    supports_cloning = False  # fixed preset voices only; ref_audio is ignored
 
     PRESET_VOICES = [
         "expr-voice-2-m", "expr-voice-2-f",
@@ -587,7 +648,13 @@ class KittenTTSBackend(TTSBackend):
             "OMNIVOICE_KITTENTTS_MODEL", "KittenML/kitten-tts-mini-0.8"
         )
         logger.info("Loading KittenTTS from %s", checkpoint)
-        self._model = KittenTTS(checkpoint)
+        # #880: the first-use load downloads ~80 MB from the HF Hub inside the
+        # generate path; if the hub's shared httpx client was closed
+        # mid-lifecycle, retry once with a fresh client instead of failing
+        # the whole generation.
+        self._model = _retry_once_with_fresh_hf_client(
+            lambda: KittenTTS(checkpoint), what="KittenTTS"
+        )
 
     def generate(self, text: str, **kw) -> torch.Tensor:
         import numpy as np
@@ -624,6 +691,54 @@ class KittenTTSBackend(TTSBackend):
 # ── MLX-Audio (mac-ARM engine multiplexer) ──────────────────────────────────
 
 
+# #977: Kokoro's own ALIASES table (mlx_audio.tts.models.kokoro.pipeline) only
+# recognizes ISO-ish tokens ("en", "es", "fr-fr", "pt-br", …) — it has no idea
+# what a full language name is. OmniVoice's `language` kwarg is normally a
+# full display name from frontend/src/languages.json (e.g. "Dutch",
+# "Spanish"), forwarded verbatim by the frontend and by
+# `OmniVoiceBackend.generate()`. Translate the subset Kokoro actually
+# supports to the ISO token its own ALIASES expects; a caller that already
+# passes an ISO code (or one of Kokoro's own single-letter codes) is
+# resolved unchanged by `resolve_kokoro_lang_code()` below.
+_KOKORO_ISO_BY_FULL_NAME = {
+    "english": "en",
+    "spanish": "es",
+    "french": "fr",
+    "hindi": "hi",
+    "italian": "it",
+    "portuguese": "pt",
+    "japanese": "ja",
+    "chinese": "zh",
+}
+
+
+def resolve_kokoro_lang_code(language: str) -> str:
+    """Map a full language name / ISO code to Kokoro's single-letter
+    `lang_code`, against the AUTHORITATIVE table read from the installed
+    mlx-audio package (never a hardcoded guess — the vendored table is the
+    only source of truth and can change across mlx-audio versions).
+
+    Raises ``ValueError`` for anything Kokoro doesn't support, naming what
+    it *does* support — instead of forwarding a bogus code into Kokoro's
+    `assert lang_code in LANG_CODES`, which crashes with an unreadable
+    ``(lang_code, LANG_CODES)`` tuple/dict repr (#977).
+    """
+    from mlx_audio.tts.models.kokoro.pipeline import ALIASES, LANG_CODES
+
+    key = language.strip().lower()
+    iso = _KOKORO_ISO_BY_FULL_NAME.get(key, key)
+    code = ALIASES.get(iso, iso)
+    if code not in LANG_CODES:
+        supported = ", ".join(sorted(name.title() for name in _KOKORO_ISO_BY_FULL_NAME))
+        raise ValueError(
+            f"mlx-audio's Kokoro model (mlx-community/Kokoro-82M-bf16) doesn't "
+            f"support language={language!r}. Kokoro supports: {supported}. "
+            f"Pick one of those, leave language as 'Auto', or switch to a "
+            f"multilingual engine (e.g. OmniVoice) for other languages."
+        )
+    return code
+
+
 class MLXAudioBackend(TTSBackend):
     """Blaizzy/mlx-audio — Apple-Silicon-only wrapper over 14+ TTS engines
     (Kokoro, CSM, Dia, Qwen3-TTS, Chatterbox, MeloTTS, OuteTTS, Spark,
@@ -662,7 +777,16 @@ class MLXAudioBackend(TTSBackend):
     def __init__(self):
         self._model = None
         self._sr = 24000  # most mlx-audio engines emit 24 kHz mono
-        key = os.environ.get("OMNIVOICE_MLX_AUDIO_MODEL", self.DEFAULT_MODEL_KEY)
+        # Env var > persisted UI choice (#981 — Settings → Engines curated-
+        # model picker) > default. Mirrors active_backend_id()'s resolution
+        # order exactly so power-users can still pin a model without the UI
+        # silently undoing it.
+        from core import prefs
+        key = prefs.resolve(
+            "mlx_audio_model_id",
+            env="OMNIVOICE_MLX_AUDIO_MODEL",
+            default=self.DEFAULT_MODEL_KEY,
+        )
         # Accept either a curated key ("kokoro") or a full HF repo id
         # ("mlx-community/Kokoro-82M-bf16") — flexibility for power users.
         self._model_id = self.CURATED_MODELS.get(key, key)
@@ -700,6 +824,18 @@ class MLXAudioBackend(TTSBackend):
         # silently ignores languages it doesn't know.
         return ["multi"]
 
+    @property
+    def supports_cloning(self) -> bool:
+        """Model-dependent — this adapter multiplexes 7+ curated models and
+        only some take a reference-audio speaker prompt. `generate()` passes
+        `ref_audio` through when present (~kwargs below) but silently retries
+        without it on a TypeError, so an engine picked for cloning that's
+        actually running Kokoro/Qwen3-TTS/etc. would clone nothing. Of the
+        curated set, only CSM (`mlx-community/csm-1b-8bit`) is confirmed to
+        accept a reference prompt — default False for every other model,
+        curated or user-supplied, until positively confirmed."""
+        return self._model_id == self.CURATED_MODELS.get("csm")
+
     def _ensure_loaded(self):
         if self._model is not None:
             return
@@ -723,7 +859,25 @@ class MLXAudioBackend(TTSBackend):
         kwargs = {"text": text, "speed": speed}
         if voice:     kwargs["voice"] = voice
         if ref_audio: kwargs["ref_audio"] = ref_audio
-        if language:  kwargs["lang_code"] = language[:2].lower()
+        if language and language != "Auto":
+            if self._model_id == self.CURATED_MODELS.get("kokoro"):
+                # Kokoro's vendored pipeline hard-asserts `lang_code` against
+                # its own single-letter table — a bogus code crashes with an
+                # unreadable AssertionError instead of failing cleanly
+                # (#977). Resolve against the authoritative installed table
+                # instead of guessing via `language[:2]`.
+                kwargs["lang_code"] = resolve_kokoro_lang_code(language)
+            else:
+                # `lang_code`-as-2-letter-truncation is Kokoro's own
+                # convention, not mlx-audio's in general — other curated
+                # models either ignore unrecognized kwargs (CSM/Dia/OuteTTS
+                # accept **kwargs and drop it) or expect something else
+                # entirely (Qwen3-TTS's own docstring: "lang_code: Language
+                # code (auto, chinese, english, etc.)" — a full name, not a
+                # 2-letter code). Kokoro's strict validation doesn't apply to
+                # them, so don't reject a language that's valid for whatever
+                # model is actually active.
+                kwargs["lang_code"] = language[:2].lower()
 
         pieces = []
         try:
@@ -1052,6 +1206,7 @@ class SherpaOnnxBackend(TTSBackend):
     # Sherpa-ONNX uses the onnxruntime providers — CPU is the universal
     # baseline; CUDA provider is available on Linux/Windows installs.
     gpu_compat = ("cuda", "cpu")
+    supports_cloning = False  # VITS speaker-id only; no ref_audio support
 
     def __init__(self):
         self._tts = None
@@ -1061,13 +1216,34 @@ class SherpaOnnxBackend(TTSBackend):
     def is_available(cls) -> tuple[bool, str]:
         try:
             import sherpa_onnx  # noqa: F401
-            return True, "ready"
         except ImportError as e:
             return False, (
                 f"sherpa-onnx not installed: {e}. "
                 "Install with: pip install sherpa-onnx. "
                 "Download models from https://github.com/k2-fsa/sherpa-onnx/releases"
             )
+        # #919: sherpa-onnx ships no bundled default model — it can only
+        # synthesize once OMNIVOICE_SHERPA_MODEL points at a downloaded model
+        # directory. Gate on it here (like the other path-configured opt-in
+        # engines: Confucius4/dots/MOSS) so the picker marks it unavailable-
+        # with-a-reason instead of letting a user select it, generate, and hit
+        # a config error that used to be mislabeled as out-of-memory.
+        model_dir = os.environ.get("OMNIVOICE_SHERPA_MODEL", "").strip()
+        if not model_dir:
+            return False, (
+                "OMNIVOICE_SHERPA_MODEL not set. Point it to a sherpa-onnx TTS "
+                "model directory (containing model.onnx + tokens.txt), then "
+                "restart OmniVoice. Download models from "
+                "https://github.com/k2-fsa/sherpa-onnx/releases"
+            )
+        if not os.path.isfile(os.path.join(model_dir, "model.onnx")):
+            return False, (
+                f"No model.onnx in OMNIVOICE_SHERPA_MODEL ({model_dir}). Point "
+                "it at a sherpa-onnx TTS model directory containing model.onnx "
+                "+ tokens.txt. Download models from "
+                "https://github.com/k2-fsa/sherpa-onnx/releases"
+            )
+        return True, "ready"
 
     @property
     def sample_rate(self) -> int:
@@ -1200,7 +1376,13 @@ class _LazyRegistry(dict):
         # effect on every list_backends() call — we keep iteration light
         # and let the caller's __getitem__ trigger the import.
         seen: set[str] = set()
-        for k in dict.__iter__(self):
+        # Snapshot the live keys before yielding. A concurrent thread's lazy
+        # __getitem__ inserts into self (self[key] = cls), and list_backends()
+        # runs in a FastAPI threadpool — so holding a *live* dict iterator open
+        # across the per-engine is_available() probes would raise
+        # "dictionary changed size during iteration". list() consumes the
+        # iterator atomically under the GIL, closing that window.
+        for k in list(dict.__iter__(self)):
             seen.add(k)
             yield k
         for k in _LAZY_REGISTRY:
@@ -1263,6 +1445,38 @@ _INSTALL_HINTS: dict[str, str] = {
 }
 
 
+# Copy-paste-ready setup line for opt-in engines gated behind a filesystem-path
+# env var (issue #498 / #590). The install_hint tells users a var exists; this
+# is the *exact* `export VAR=...` line to run, so they don't have to reconstruct
+# it from the docs. Surfaced verbatim in the Compat Matrix's "Why unavailable?"
+# disclosure with a Copy button. Single-sourced here so it can't drift from the
+# var each engine's is_available() actually reads. bash/zsh form (the dominant
+# clone-and-run workflow for these engines; dots.tts is *nix-only anyway).
+_SETUP_SNIPPETS: dict[str, str] = {
+    "indextts2":      "export OMNIVOICE_INDEXTTS_DIR=/path/to/index-tts",
+    "moss-tts-v15":   "export OMNIVOICE_MOSS_TTS_V15_DIR=/path/to/MOSS-TTS",
+    "dots-tts":       "export OMNIVOICE_DOTS_TTS_DIR=/path/to/dots.tts",
+    "confucius4-tts": "export OMNIVOICE_CONFUCIUS4_TTS_DIR=/path/to/Confucius4-TTS",
+    # #919: sherpa-onnx gates on a downloaded model dir (model.onnx + tokens.txt).
+    "sherpa-onnx":    "export OMNIVOICE_SHERPA_MODEL=/path/to/sherpa-onnx-model",
+}
+
+
+# Short, readable labels for mlx-audio's curated models (#981) — surfaced in
+# the Settings → Engines model picker so users see more than a bare key.
+# Single-sourced here rather than on MLXAudioBackend.CURATED_MODELS itself so
+# the class dict stays a plain key → repo-id map (what __init__ needs).
+_MLX_AUDIO_MODEL_LABELS: dict[str, str] = {
+    "kokoro":     "Kokoro (default, fast)",
+    "csm":        "CSM (voice cloning)",
+    "qwen3-tts":  "Qwen3-TTS (voice design)",
+    "dia":        "Dia",
+    "chatterbox": "Chatterbox",
+    "melotts":    "MeloTTS (lightweight)",
+    "outetts":    "OuteTTS",
+}
+
+
 def list_backends() -> list[dict]:
     """Enumerate every registered backend with its availability state.
 
@@ -1274,6 +1488,7 @@ def list_backends() -> list[dict]:
           "available":      bool,
           "reason":         Optional[str],          # message when not available
           "install_hint":   Optional[str],
+          "setup_snippet":  Optional[str],          # exact `export VAR=...` for path-gated opt-in engines
           "last_error":     Optional[str],          # cached most-recent failure
           "isolation_mode": "in-process" | "subprocess",
           "gpu_compat":     list[str],              # subset of {cuda, rocm, mps, xpu, cpu}
@@ -1337,12 +1552,30 @@ def list_backends() -> list[dict]:
             "available": ok,
             "reason": None if ok else _mask_hf_tokens(msg),
             "install_hint": _INSTALL_HINTS.get(bid),
+            # Exact `export VAR=...` line for path-gated opt-in engines, or None.
+            "setup_snippet": _SETUP_SNIPPETS.get(bid),
             "last_error": _LAST_ERRORS.get(bid),
             "isolation_mode": isolation,
             "gpu_compat": list(gpu_compat),
             # effective_device / routing_status / routing_reason (scrubbed):
             **routing_fields(gpu_compat, caps),
         })
+        # #981: mlx-audio multiplexes 7+ curated models behind one backend id
+        # — surface the roster + the currently-active pick so Settings can
+        # render a model picker instead of always defaulting to Kokoro.
+        # mlx-audio ONLY; every other backend loads a single fixed model.
+        if bid == "mlx-audio":
+            from core import prefs
+            active_model = prefs.resolve(
+                "mlx_audio_model_id",
+                env="OMNIVOICE_MLX_AUDIO_MODEL",
+                default=cls.DEFAULT_MODEL_KEY,
+            )
+            out[-1]["curated_models"] = [
+                {"key": key, "label": _MLX_AUDIO_MODEL_LABELS.get(key, key), "repo_id": repo_id}
+                for key, repo_id in cls.CURATED_MODELS.items()
+            ]
+            out[-1]["active_model_id"] = active_model
     return out
 
 
@@ -1352,6 +1585,29 @@ def get_backend_class(backend_id: str) -> type[TTSBackend]:
     return _REGISTRY[backend_id]
 
 
+def cloning_capable_engine_ids() -> list[str]:
+    """Engine ids that support reference-audio voice cloning — used to build
+    an actionable error when the active engine can't (dub/batch gating).
+
+    Iterates the same registry ``list_backends()`` uses, via ``.items()`` so
+    lazy entries resolve through ``_LazyRegistry``'s snapshot-safe iteration
+    (see ``_LazyRegistry.__iter__``) exactly like every other registry scan
+    in this module.
+
+    A class-level ``getattr`` on a *property* returns the descriptor object
+    itself (always truthy) rather than its computed value — so a
+    model-dependent adapter like ``MLXAudioBackend`` (only some of its 7+
+    curated models can clone) would always show up here regardless of which
+    model is actually configured. Excluded rather than falsely recommended:
+    ``isinstance(..., bool)`` is False for a descriptor, True for a plain
+    class attribute.
+    """
+    return [
+        bid for bid, cls in _REGISTRY.items()
+        if isinstance((v := getattr(cls, "supports_cloning", True)), bool) and v
+    ]
+
+
 def active_routing() -> dict | None:
     """Routing verdict for the currently-active TTS engine, or ``None`` if it
     can't be determined (no engine / probe failure).
@@ -1420,15 +1676,21 @@ def active_backend_id() -> str:
 # call the outgoing engine's unload() before switching.
 _active_instance: "TTSBackend | None" = None
 _active_instance_id: "str | None" = None
+# mlx-audio multiplexes 7+ curated models behind one backend id — a model-only
+# switch (same "mlx-audio" id, different curated model) must also invalidate
+# the cache, or picking a different model in Settings has no effect until the
+# app restarts (#981). Only meaningful when _active_instance_id == "mlx-audio".
+_active_mlx_model_key: "str | None" = None
 
 
 def reset_active_backend() -> None:
     """Unload + clear the cached active backend. For app shutdown and tests.
     Idempotent and best-effort — a raising unload() never propagates."""
-    global _active_instance, _active_instance_id
+    global _active_instance, _active_instance_id, _active_mlx_model_key
     inst = _active_instance
     _active_instance = None
     _active_instance_id = None
+    _active_mlx_model_key = None
     if inst is not None:
         try:
             inst.unload()
@@ -1446,13 +1708,32 @@ def get_active_tts_backend(*, model=None) -> TTSBackend:
     ``model=`` (caller already holds a loaded model), we return a fresh view
     over the shared singleton rather than caching it — but a switch *away from*
     a different engine still triggers that engine's unload().
+
+    For mlx-audio specifically, the backend id alone doesn't capture *which*
+    curated model is loaded (#981) — so we also track the resolved model key
+    and treat a model-only change as a switch, reusing the exact same
+    unload-and-reconstruct path as an id switch.
     """
-    global _active_instance, _active_instance_id
+    global _active_instance, _active_instance_id, _active_mlx_model_key
     bid = active_backend_id()
 
-    # Switching engines: release the outgoing one first. Best-effort so a bad
-    # unload() can never block the switch.
-    if _active_instance is not None and _active_instance_id != bid:
+    mlx_model_key = None
+    if bid == "mlx-audio":
+        from core import prefs
+        mlx_model_key = prefs.resolve(
+            "mlx_audio_model_id",
+            env="OMNIVOICE_MLX_AUDIO_MODEL",
+            default=MLXAudioBackend.DEFAULT_MODEL_KEY,
+        )
+
+    # Switching engines (or, for mlx-audio, switching curated models): release
+    # the outgoing one first. Best-effort so a bad unload() can never block
+    # the switch.
+    switching = _active_instance is not None and (
+        _active_instance_id != bid
+        or (bid == "mlx-audio" and mlx_model_key != _active_mlx_model_key)
+    )
+    if switching:
         try:
             _active_instance.unload()
         except Exception as exc:  # noqa: BLE001
@@ -1460,6 +1741,7 @@ def get_active_tts_backend(*, model=None) -> TTSBackend:
                            type(_active_instance).__name__, exc)
         _active_instance = None
         _active_instance_id = None
+        _active_mlx_model_key = None
 
     cls = get_backend_class(bid)
     if cls is OmniVoiceBackend and model is not None:
@@ -1471,9 +1753,82 @@ def get_active_tts_backend(*, model=None) -> TTSBackend:
     if _active_instance is None or _active_instance_id != bid:
         _active_instance = OmniVoiceBackend(model=model) if cls is OmniVoiceBackend else cls()
         _active_instance_id = bid
+        _active_mlx_model_key = mlx_model_key
     return _active_instance
 
 
+# ── Shared generation-time engine resolution (issue #312 class) ───────────
+#
+# dub_generate.py and batch.py used to call services.model_manager.get_model()
+# directly, hardcoding OmniVoice regardless of the engine selected in
+# Settings → Engines — a SILENT fallback: pick VoxCPM2, dub anyway with
+# OmniVoice, no error. This is the single resolution path both routers now
+# call instead, mirroring generation.py's /generate resolution (engine id →
+# is_available() → routing gate) plus a voice-cloning capability gate that
+# /generate doesn't need (OmniVoice's native path always clones).
+
+
+async def resolve_generation_backend(
+    *, require_cloning: bool = False, cloning_purpose: str = "dubbing",
+) -> TTSBackend:
+    """Resolve + validate the active TTS engine for a generation call.
+
+    Returns the live backend instance (:func:`get_active_tts_backend`) —
+    cached, and properly unload()ed on an engine switch. Raises ``ValueError``
+    with an actionable message (never silently falls back to OmniVoice) when:
+
+      * the configured engine id is unknown (bad env var / stale pref),
+      * the engine reports itself unavailable (``is_available()``),
+      * the engine needs an accelerator this host lacks and has no CPU path
+        (``routing_status == "unavailable"``),
+      * ``require_cloning`` is True and the resolved backend can't clone
+        from reference audio (``supports_cloning`` False) — checked on the
+        live *instance*, not the class, so a model-dependent adapter like
+        MLX-Audio (Kokoro vs. CSM) is judged by what's actually loaded.
+    """
+    engine_id = active_backend_id()
+    try:
+        backend_cls = get_backend_class(engine_id)
+    except ValueError as e:
+        raise ValueError(
+            f"Active TTS engine '{engine_id}' is not a recognized backend ({e}). "
+            "Check Settings → Engines or the OMNIVOICE_TTS_BACKEND env var."
+        ) from e
+
+    try:
+        ok, msg = backend_cls.is_available()
+    except Exception as exc:  # noqa: BLE001 — surface as an actionable ValueError
+        ok, msg = False, f"{type(exc).__name__}: {exc}"
+    if not ok:
+        raise ValueError(f"TTS engine '{engine_id}' is not available: {_mask_hf_tokens(msg)}")
+
+    from core.device_caps import detect_host_caps
+    from services.engine_routing import resolve_routing
+    routing = resolve_routing(getattr(backend_cls, "gpu_compat", ("cpu",)), detect_host_caps())
+    if routing["routing_status"] == "unavailable":
+        raise ValueError(routing["routing_reason"])
+
+    _model = None
+    if backend_cls is OmniVoiceBackend:
+        # OmniVoice needs its model pre-loaded before construction: called
+        # from an async context, OmniVoiceBackend._ensure_loaded() refuses to
+        # bootstrap its own event loop (see its docstring) — same reason
+        # generation.py's /generate special-cases this backend.
+        from services.model_manager import get_model
+        _model = await get_model()
+    backend = get_active_tts_backend(model=_model)
+
+    if require_cloning and not getattr(backend, "supports_cloning", True):
+        raise ValueError(
+            f"The active TTS engine '{engine_id}' doesn't support voice cloning, "
+            f"so {cloning_purpose} can't preserve speaker voices. Switch to one "
+            f"of: {', '.join(cloning_capable_engine_ids())} in Settings → "
+            "Engines, or use OmniVoice for this job."
+        )
+
+    return backend
+
+
 # ── PEP 562 lazy attribute re-export ───────────────────────────────────────
 #
 # Allows ``from services.tts_backend import IndexTTS2Backend`` to keep

backend/tests/test_asr_transcribe_timeout.py

@@ -17,14 +17,25 @@ import pytest
 
 sys.path.insert(0, os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__)))))
 
+from services import asr_backend  # noqa: E402
 from services.asr_backend import (  # noqa: E402
     ASRTimeoutError,
     ASR_TRANSCRIBE_TIMEOUT_S,
+    reset_pool_after_wedge,
     run_transcribe_guarded,
 )
 from concurrent.futures import ThreadPoolExecutor  # noqa: E402
 
 
+@pytest.fixture(autouse=True)
+def _fresh_timeout_streak(monkeypatch):
+    """The consecutive-timeout streak (#730 residual B) is process-global
+    session state; zero it per test so ordering can't leak recommendations,
+    and pin the active engine so a dev box's prefs can't flip the hint."""
+    monkeypatch.setattr(asr_backend, "_timeout_streak", 0)
+    monkeypatch.setattr(asr_backend, "active_backend_id", lambda: "whisperx")
+
+
 def test_default_timeout_is_env_overridable(monkeypatch):
     # The constant is read at import; just assert it's a sane positive default.
     assert ASR_TRANSCRIBE_TIMEOUT_S > 0
@@ -113,3 +124,115 @@ def test_timeout_without_reset_capable_pool_does_not_crash():
 
     asyncio.run(_go())
     pool.shutdown(wait=False)
+
+
+# ── Residual B on #730: consecutive timeouts recommend the isolated engine ──
+
+
+def _hang_forever():
+    time.sleep(5)
+    return "never"
+
+
+async def _timeout_once(pool, timeout=0.1) -> str:
+    with pytest.raises(ASRTimeoutError) as ei:
+        await run_transcribe_guarded(pool, _hang_forever, what="Dub", timeout=timeout)
+    return str(ei.value)
+
+
+def test_second_consecutive_timeout_recommends_isolated_engine():
+    """When guarded timeouts hit twice in a row in one session, pool resets
+    clearly aren't recovering the hang — the error the user sees must name the
+    crash-isolated escape-hatch engine (and make clear we never auto-switch)."""
+    pool = ThreadPoolExecutor(max_workers=2)
+
+    async def _go():
+        first = await _timeout_once(pool)
+        assert "faster-whisper-isolated" not in first  # one timeout ≠ a pattern
+        second = await _timeout_once(pool)
+        assert "faster-whisper-isolated" in second
+        assert "Settings → Engines" in second
+        assert "never switches engines automatically" in second
+
+    asyncio.run(_go())
+    pool.shutdown(wait=False)
+
+
+def test_successful_transcribe_resets_the_timeout_streak():
+    """'Consecutive' must mean consecutive: a transcribe that completes between
+    two timeouts proves the pool recovered, so the recommendation must not fire."""
+    pool = ThreadPoolExecutor(max_workers=3)
+
+    async def _go():
+        await _timeout_once(pool)
+        out = await run_transcribe_guarded(pool, lambda: "ok", what="Dub", timeout=5.0)
+        assert out == "ok"
+        second = await _timeout_once(pool)
+        assert "faster-whisper-isolated" not in second
+
+    asyncio.run(_go())
+    pool.shutdown(wait=False)
+
+
+def test_no_recommendation_when_already_on_isolated_engine(monkeypatch):
+    """Recommending the isolated engine to a user already running it is noise —
+    the base message's smaller-model/CPU guidance is all that's left."""
+    monkeypatch.setattr(
+        asr_backend, "active_backend_id", lambda: "faster-whisper-isolated"
+    )
+    pool = ThreadPoolExecutor(max_workers=2)
+
+    async def _go():
+        await _timeout_once(pool)
+        second = await _timeout_once(pool)
+        assert "faster-whisper-isolated) in Settings" not in second
+        assert "never switches engines automatically" not in second
+
+    asyncio.run(_go())
+    pool.shutdown(wait=False)
+
+
+def test_timeout_env_name_is_parameterized():
+    """The chunked dub path passes its own knob; the message must name IT, not
+    the whole-file env var (actionable errors point at the right dial)."""
+    pool = ThreadPoolExecutor(max_workers=1)
+
+    async def _go():
+        with pytest.raises(ASRTimeoutError) as ei:
+            await run_transcribe_guarded(
+                pool, _hang_forever, what="Dub chunk 1/3", timeout=0.1,
+                timeout_env="OMNIVOICE_TRANSCRIBE_CHUNK_TIMEOUT_S",
+            )
+        msg = str(ei.value)
+        assert "OMNIVOICE_TRANSCRIBE_CHUNK_TIMEOUT_S" in msg
+        assert "OMNIVOICE_ASR_TRANSCRIBE_TIMEOUT_S" not in msg
+
+    asyncio.run(_go())
+    pool.shutdown(wait=False)
+
+
+def test_reset_pool_after_wedge_is_shared_and_best_effort():
+    """One reset mechanism for every transcribe path (#730 residual A): it
+    resets a reset-capable pool, no-ops a plain executor, and never raises."""
+
+    class _Pool:
+        resets = 0
+
+        def reset(self):
+            self.resets += 1
+
+    p = _Pool()
+    assert reset_pool_after_wedge(p, what="Dub chunk 1/2") is True
+    assert p.resets == 1
+
+    plain = ThreadPoolExecutor(max_workers=1)
+    try:
+        assert reset_pool_after_wedge(plain) is False
+    finally:
+        plain.shutdown(wait=False)
+
+    class _Broken:
+        def reset(self):
+            raise RuntimeError("reset blew up")
+
+    assert reset_pool_after_wedge(_Broken()) is False  # must not raise

bun.lock

@@ -16,7 +16,7 @@
     },
     "frontend": {
       "name": "omnivoice-studio",
-      "version": "0.3.8",
+      "version": "0.3.11",
       "dependencies": {
         "@fontsource-variable/inter": "^5.2.8",
         "@fontsource-variable/source-serif-4": "^5.2.9",
@@ -31,6 +31,7 @@
         "@radix-ui/react-toggle": "^1.1.12",
         "@radix-ui/react-toggle-group": "^1.1.13",
         "@radix-ui/react-tooltip": "^1.2.10",
+        "@scalar/api-reference-react": "^0.9.52",
         "@tailwindcss/vite": "^4.3.1",
         "@tanstack/react-query": "^5.101.0",
         "@tanstack/react-table": "^8.21.3",
@@ -84,6 +85,14 @@
   "packages": {
     "@adobe/css-tools": ["@adobe/css-tools@4.4.4", "", {}, "sha512-Elp+iwUx5rN5+Y8xLt5/GRoG20WGoDCQ/1Fb+1LiGtvwbDavuSk0jhD/eZdckHAuzcDzccnkv+rEjyWfRx18gg=="],
 
+    "@ai-sdk/gateway": ["@ai-sdk/gateway@3.0.13", "", { "dependencies": { "@ai-sdk/provider": "3.0.2", "@ai-sdk/provider-utils": "4.0.5", "@vercel/oidc": "3.1.0" }, "peerDependencies": { "zod": "^3.25.76 || ^4.1.8" } }, "sha512-g7nE4PFtngOZNZSy1lOPpkC+FAiHxqBJXqyRMEG7NUrEVZlz5goBdtHg1YgWRJIX776JTXAmbOI5JreAKVAsVA=="],
+
+    "@ai-sdk/provider": ["@ai-sdk/provider@3.0.2", "", { "dependencies": { "json-schema": "^0.4.0" } }, "sha512-HrEmNt/BH/hkQ7zpi2o6N3k1ZR1QTb7z85WYhYygiTxOQuaml4CMtHCWRbric5WPU+RNsYI7r1EpyVQMKO1pYw=="],
+
+    "@ai-sdk/provider-utils": ["@ai-sdk/provider-utils@4.0.5", "", { "dependencies": { "@ai-sdk/provider": "3.0.2", "@standard-schema/spec": "^1.1.0", "eventsource-parser": "^3.0.6" }, "peerDependencies": { "zod": "^3.25.76 || ^4.1.8" } }, "sha512-Ow/X/SEkeExTTc1x+nYLB9ZHK2WUId8+9TlkamAx7Tl9vxU+cKzWx2dwjgMHeCN6twrgwkLrrtqckQeO4mxgVA=="],
+
+    "@ai-sdk/vue": ["@ai-sdk/vue@3.0.33", "", { "dependencies": { "@ai-sdk/provider-utils": "4.0.5", "ai": "6.0.33", "swrv": "^1.0.4" }, "peerDependencies": { "vue": "^3.3.4" } }, "sha512-czM9Js3a7f+Eo35gjEYEeJYUoPvMg5Dfi4bOLyDBghLqn0gaVg8yTmTaSuHCg+3K/+1xPjyXd4+2XcQIohWWiQ=="],
+
     "@antfu/ni": ["@antfu/ni@30.2.0", "", { "dependencies": { "fzf": "^0.5.2", "package-manager-detector": "^1.6.0", "tinyexec": "^1.2.4", "tinyglobby": "^0.2.17" }, "bin": { "ni": "bin/ni.mjs", "nci": "bin/nci.mjs", "nr": "bin/nr.mjs", "nup": "bin/nup.mjs", "nd": "bin/nd.mjs", "nlx": "bin/nlx.mjs", "na": "bin/na.mjs", "nun": "bin/nun.mjs" } }, "sha512-/FOdAP1w8COnANVD3TtNj/tnpt/36RkU/ysKZTqx86x9acdhCqTFjDXNYVDyBg6UzcrTwWPUeY75ng7CWLNr+g=="],
 
     "@asamuzakjp/css-color": ["@asamuzakjp/css-color@5.1.11", "", { "dependencies": { "@asamuzakjp/generational-cache": "^1.0.1", "@csstools/css-calc": "^3.2.0", "@csstools/css-color-parser": "^4.1.0", "@csstools/css-parser-algorithms": "^4.0.0", "@csstools/css-tokenizer": "^4.0.0" } }, "sha512-KVw6qIiCTUQhByfTd78h2yD1/00waTmm9uy/R7Ck/ctUyAPj+AEDLkQIdJW0T8+qGgj3j5bpNKK7Q3G+LedJWg=="],
@@ -130,6 +139,30 @@
 
     "@bramus/specificity": ["@bramus/specificity@2.4.2", "", { "dependencies": { "css-tree": "^3.0.0" }, "bin": { "specificity": "bin/cli.js" } }, "sha512-ctxtJ/eA+t+6q2++vj5j7FYX3nRu311q1wfYH3xjlLOsczhlhxAg2FWNUXhpGvAw3BWo1xBcvOV6/YLc2r5FJw=="],
 
+    "@codemirror/autocomplete": ["@codemirror/autocomplete@6.20.3", "", { "dependencies": { "@codemirror/language": "^6.0.0", "@codemirror/state": "^6.0.0", "@codemirror/view": "^6.17.0", "@lezer/common": "^1.0.0" } }, "sha512-tlosUqb+3BbxCxZdu4tKeRghPFC+QM7q4X5YhKV2eCmPG+1r2F3f4AaSz5sCrFqUtX4Jh20VFTKecl16MgiV9g=="],
+
+    "@codemirror/commands": ["@codemirror/commands@6.10.4", "", { "dependencies": { "@codemirror/language": "^6.0.0", "@codemirror/state": "^6.7.0", "@codemirror/view": "^6.27.0", "@lezer/common": "^1.1.0" } }, "sha512-Ryk9y9T0FFVF0cUGhAknveAyUOl/A1qReTFi+qPKtOh2Z9F4AUBz3XOrYD4ZEgZirdugVzHvd/2/Wcwy5OliTg=="],
+
+    "@codemirror/lang-css": ["@codemirror/lang-css@6.3.1", "", { "dependencies": { "@codemirror/autocomplete": "^6.0.0", "@codemirror/language": "^6.0.0", "@codemirror/state": "^6.0.0", "@lezer/common": "^1.0.2", "@lezer/css": "^1.1.7" } }, "sha512-kr5fwBGiGtmz6l0LSJIbno9QrifNMUusivHbnA1H6Dmqy4HZFte3UAICix1VuKo0lMPKQr2rqB+0BkKi/S3Ejg=="],
+
+    "@codemirror/lang-html": ["@codemirror/lang-html@6.4.11", "", { "dependencies": { "@codemirror/autocomplete": "^6.0.0", "@codemirror/lang-css": "^6.0.0", "@codemirror/lang-javascript": "^6.0.0", "@codemirror/language": "^6.4.0", "@codemirror/state": "^6.0.0", "@codemirror/view": "^6.17.0", "@lezer/common": "^1.0.0", "@lezer/css": "^1.1.0", "@lezer/html": "^1.3.12" } }, "sha512-9NsXp7Nwp891pQchI7gPdTwBuSuT3K65NGTHWHNJ55HjYcHLllr0rbIZNdOzas9ztc1EUVBlHou85FFZS4BNnw=="],
+
+    "@codemirror/lang-javascript": ["@codemirror/lang-javascript@6.2.5", "", { "dependencies": { "@codemirror/autocomplete": "^6.0.0", "@codemirror/language": "^6.6.0", "@codemirror/lint": "^6.0.0", "@codemirror/state": "^6.0.0", "@codemirror/view": "^6.17.0", "@lezer/common": "^1.0.0", "@lezer/javascript": "^1.0.0" } }, "sha512-zD4e5mS+50htS7F+TYjBPsiIFGanfVqg4HyUz6WNFikgOPf2BgKlx+TQedI1w6n/IqRBVBbBWmGFdLB/7uxO4A=="],
+
+    "@codemirror/lang-json": ["@codemirror/lang-json@6.0.2", "", { "dependencies": { "@codemirror/language": "^6.0.0", "@lezer/json": "^1.0.0" } }, "sha512-x2OtO+AvwEHrEwR0FyyPtfDUiloG3rnVTSZV1W8UteaLL8/MajQd8DpvUb2YVzC+/T18aSDv0H9mu+xw0EStoQ=="],
+
+    "@codemirror/lang-xml": ["@codemirror/lang-xml@6.1.0", "", { "dependencies": { "@codemirror/autocomplete": "^6.0.0", "@codemirror/language": "^6.4.0", "@codemirror/state": "^6.0.0", "@codemirror/view": "^6.0.0", "@lezer/common": "^1.0.0", "@lezer/xml": "^1.0.0" } }, "sha512-3z0blhicHLfwi2UgkZYRPioSgVTo9PV5GP5ducFH6FaHy0IAJRg+ixj5gTR1gnT/glAIC8xv4w2VL1LoZfs+Jg=="],
+
+    "@codemirror/lang-yaml": ["@codemirror/lang-yaml@6.1.3", "", { "dependencies": { "@codemirror/autocomplete": "^6.0.0", "@codemirror/language": "^6.0.0", "@codemirror/state": "^6.0.0", "@lezer/common": "^1.2.0", "@lezer/highlight": "^1.2.0", "@lezer/lr": "^1.0.0", "@lezer/yaml": "^1.0.0" } }, "sha512-AZ8DJBuXGVHybpBQhmZtgew5//4hv3tdkXnr3vDmOUMJRuB6vn/uuwtmTOTlqEaQFg3hQSVeA90NmvIQyUV6FQ=="],
+
+    "@codemirror/language": ["@codemirror/language@6.12.4", "", { "dependencies": { "@codemirror/state": "^6.0.0", "@codemirror/view": "^6.23.0", "@lezer/common": "^1.5.0", "@lezer/highlight": "^1.0.0", "@lezer/lr": "^1.0.0", "style-mod": "^4.0.0" } }, "sha512-1q4PaT+o6PbgpkJt4Q8Fv5XJxTy4FUZ4MWETtyiDw3J0Pyr9E2vqcKL+k9wcvjNTIsauxvE7OfmWj3FRPHQ76A=="],
+
+    "@codemirror/lint": ["@codemirror/lint@6.9.7", "", { "dependencies": { "@codemirror/state": "^6.0.0", "@codemirror/view": "^6.42.0", "crelt": "^1.0.5" } }, "sha512-28/+iWLYxKxsvGYhSYL7zaCZqLz5+FFFDq9tVsvGv9kv8RY4fFAchJ5WX9M3YrrRlTIsECjsXPqeNgnSmNP2dg=="],
+
+    "@codemirror/state": ["@codemirror/state@6.7.0", "", { "dependencies": { "@marijn/find-cluster-break": "^1.0.0" } }, "sha512-Zbl9NyscLMZkfXPQnNAIIAFftidrA1UbcJEIMp24C0Bukc2I5T8wJS0wsXYsnDOqCFJUeJ1BITGNs5CqPDSmSg=="],
+
+    "@codemirror/view": ["@codemirror/view@6.43.4", "", { "dependencies": { "@codemirror/state": "^6.7.0", "crelt": "^1.0.6", "style-mod": "^4.1.0", "w3c-keyname": "^2.2.4" } }, "sha512-YImu23iyKfncJzT7sRy+rEqEhSc8RhOHqDxwy4WzXRKJwYm6iwf/9OJk5ctCAdZ6yi2ZqaGEvmf55fSVqMDrgg=="],
+
     "@csstools/color-helpers": ["@csstools/color-helpers@6.0.2", "", {}, "sha512-LMGQLS9EuADloEFkcTBR3BwV/CGHV7zyDxVRtVDTwdI2Ca4it0CCVTT9wCkxSgokjE5Ho41hEPgb8OEUwoXr6Q=="],
 
     "@csstools/css-calc": ["@csstools/css-calc@3.2.0", "", { "peerDependencies": { "@csstools/css-parser-algorithms": "^4.0.0", "@csstools/css-tokenizer": "^4.0.0" } }, "sha512-bR9e6o2BDB12jzN/gIbjHa5wLJ4UjD1CB9pM7ehlc0ddk6EBz+yYS1EV2MF55/HUxrHcB/hehAyt5vhsA3hx7w=="],
@@ -170,7 +203,9 @@
 
     "@floating-ui/react-dom": ["@floating-ui/react-dom@2.1.8", "", { "dependencies": { "@floating-ui/dom": "^1.7.6" }, "peerDependencies": { "react": ">=16.8.0", "react-dom": ">=16.8.0" } }, "sha512-cC52bHwM/n/CxS87FH0yWdngEZrjdtLW/qVruo68qg+prK7ZQ4YGdut2GyDVpoGeAYe/h899rVeOVm6Oi40k2A=="],
 
-    "@floating-ui/utils": ["@floating-ui/utils@0.2.11", "", {}, "sha512-RiB/yIh78pcIxl6lLMG0CgBXAZ2Y0eVHqMPYugu+9U0AeT6YBeiJpf7lbdJNIugFP5SIjwNRgo4DhR1Qxi26Gg=="],
+    "@floating-ui/utils": ["@floating-ui/utils@0.2.10", "", {}, "sha512-aGTxbpbg8/b5JfU1HXSrbH3wXZuLPJcNEcZQFMxLs3oSzgtVu6nFPkbbGGUvBcUjKV2YyB9Wxxabo+HEH9tcRQ=="],
+
+    "@floating-ui/vue": ["@floating-ui/vue@1.1.9", "", { "dependencies": { "@floating-ui/dom": "^1.7.4", "@floating-ui/utils": "^0.2.10", "vue-demi": ">=0.13.0" } }, "sha512-BfNqNW6KA83Nexspgb9DZuz578R7HT8MZw1CfK9I6Ah4QReNWEJsXWHN+SdmOVLNGmTPDi+fDT535Df5PzMLbQ=="],
 
     "@fontsource-variable/inter": ["@fontsource-variable/inter@5.2.8", "", {}, "sha512-kOfP2D+ykbcX/P3IFnokOhVRNoTozo5/JxhAIVYLpea/UBmCQ/YWPBfWIDuBImXX/15KH+eKh4xpEUyS2sQQGQ=="],
 
@@ -190,6 +225,10 @@
 
     "@hapi/topo": ["@hapi/topo@6.0.2", "", { "dependencies": { "@hapi/hoek": "^11.0.2" } }, "sha512-KR3rD5inZbGMrHmgPxsJ9dbi6zEK+C3ZwUwTa+eMwWLz7oijWUTWD2pMSNNYJAU6Qq+65NkxXjqHr/7LM2Xkqg=="],
 
+    "@headlessui/tailwindcss": ["@headlessui/tailwindcss@0.2.2", "", { "peerDependencies": { "tailwindcss": "^3.0 || ^4.0" } }, "sha512-xNe42KjdyA4kfUKLLPGzME9zkH7Q3rOZ5huFihWNWOQFxnItxPB3/67yBI8/qBfY8nwBRx5GHn4VprsoluVMGw=="],
+
+    "@headlessui/vue": ["@headlessui/vue@1.7.23", "", { "dependencies": { "@tanstack/vue-virtual": "^3.0.0-beta.60" }, "peerDependencies": { "vue": "^3.2.0" } }, "sha512-JzdCNqurrtuu0YW6QaDtR2PIYCKPUWq28csDyMvN4zmGccmE7lz40Is6hc3LA4HFeCI7sekZ/PQMTNmn9I/4Wg=="],
+
     "@henrygd/queue": ["@henrygd/queue@1.2.0", "", {}, "sha512-jW/BLSTpcvExDhqJGxtIPgGr2O0IFF8XUNDwEbfCfhrXT8a4xztQ9Lv6U/vbYzYC0xVWn+3zv6YnLUh3bEFUKA=="],
 
     "@humanfs/core": ["@humanfs/core@0.19.1", "", {}, "sha512-5DyQ4+1JEUzejeK1JGICcideyfUbGixgS9jNgex5nqkW+cY7WZhxBigmieN5Qnw9ZosSNVC9KQKyb+GUaGyKUA=="],
@@ -200,6 +239,10 @@
 
     "@humanwhocodes/retry": ["@humanwhocodes/retry@0.4.3", "", {}, "sha512-bV0Tgo9K4hfPCek+aMAn81RppFKv2ySDQeMoSZuvTASywNTnVJCArCZE2FWqpvIatKu7VMRLWlR1EazvVhDyhQ=="],
 
+    "@internationalized/date": ["@internationalized/date@3.12.2", "", { "dependencies": { "@swc/helpers": "^0.5.0" } }, "sha512-FY1Y+H64NDs+HAF6omlnWxm3mEpfgaCSWtL5l551ZZfImA+kGjPFgrnJrGjH6lfmLL0g8Z/mBu1R3kufeCp6Jw=="],
+
+    "@internationalized/number": ["@internationalized/number@3.6.7", "", { "dependencies": { "@swc/helpers": "^0.5.0" } }, "sha512-3ji1fcrT+FPAK86UqEhB/psHixYo6niWPJtt7+qRaYFynt/BaJG8GhAPimtWUpEiVSTq8ZM8L5psMxGquiB/Vg=="],
+
     "@jridgewell/gen-mapping": ["@jridgewell/gen-mapping@0.3.13", "", { "dependencies": { "@jridgewell/sourcemap-codec": "^1.5.0", "@jridgewell/trace-mapping": "^0.3.24" } }, "sha512-2kkt/7niJ6MgEPxF0bYdQ6etZaA+fQvDcLKckhy1yIQOzaoKjBBjSj63/aLVjYE3qhRt5dvM+uUyfCg6UKCBbA=="],
 
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@@ -210,8 +253,30 @@
 
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+
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@@ -368,6 +433,8 @@
 
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@@ -446,6 +513,8 @@
 
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@@ -478,12 +547,64 @@
 
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+    "@scalar/workspace-store": ["@scalar/workspace-store@0.55.2", "", { "dependencies": { "@scalar/asyncapi-upgrader": "0.1.2", "@scalar/helpers": "0.9.0", "@scalar/json-magic": "0.12.17", "@scalar/openapi-upgrader": "0.2.9", "@scalar/schemas": "0.7.1", "@scalar/snippetz": "0.9.20", "@scalar/typebox": "0.1.3", "@scalar/types": "0.16.1", "@scalar/validation": "0.6.0", "js-base64": "^3.7.8", "type-fest": "^5.3.1", "vue": "^3.5.30", "yaml": "^2.8.3" } }, "sha512-/8BfJkave9vmweLdzH7w2TCaUFNcLu1vmE87id0QIi08enOwOExmPsz8YpUtaKLHM2bi/R2Tj/s9Uwp9i8Lttw=="],
+
     "@sec-ant/readable-stream": ["@sec-ant/readable-stream@0.4.1", "", {}, "sha512-831qok9r2t8AlxLko40y2ebgSDhenenCatLVeW/uBtnHPyhHOvG0C7TvfgecV+wHzIm5KUICgzmVpWS+IMEAeg=="],
 
     "@sindresorhus/merge-streams": ["@sindresorhus/merge-streams@4.0.0", "", {}, "sha512-tlqY9xq5ukxTUZBmoOp+m61cqwQD5pHJtFY3Mn8CA8ps6yghLH/Hw8UPdqg4OLmFW3IFlcXnQNmo/dh8HzXYIQ=="],
 
     "@standard-schema/spec": ["@standard-schema/spec@1.1.0", "", {}, "sha512-l2aFy5jALhniG5HgqrD6jXLi/rUWrKvqN/qJx6yoJsgKhblVd+iqqU4RCXavm/jPityDo5TCvKMnpjKnOriy0w=="],
 
+    "@swc/helpers": ["@swc/helpers@0.5.23", "", { "dependencies": { "tslib": "^2.8.0" } }, "sha512-5lSsMOTXURePglDfvuAQUqkGek9Hg2kksOYay2m0+XR++b2NWYL/4sWyuvVBIs8oKnJaxkdi9whaL/sqN13afw=="],
+
     "@tailwindcss/node": ["@tailwindcss/node@4.3.1", "", { "dependencies": { "@jridgewell/remapping": "^2.3.5", "enhanced-resolve": "5.21.6", "jiti": "^2.7.0", "lightningcss": "1.32.0", "magic-string": "^0.30.21", "source-map-js": "^1.2.1", "tailwindcss": "4.3.1" } }, "sha512-6NDaqRoAMSXD1mr/RXu0HBvNE9a2n5tHPsxu9XHLws8o4Twes5rBM2205SUUiJ9goAtadrN6xTGX0UDEwp/N4A=="],
 
     "@tailwindcss/oxide": ["@tailwindcss/oxide@4.3.1", "", { "optionalDependencies": { "@tailwindcss/oxide-android-arm64": "4.3.1", "@tailwindcss/oxide-darwin-arm64": "4.3.1", "@tailwindcss/oxide-darwin-x64": "4.3.1", "@tailwindcss/oxide-freebsd-x64": "4.3.1", "@tailwindcss/oxide-linux-arm-gnueabihf": "4.3.1", "@tailwindcss/oxide-linux-arm64-gnu": "4.3.1", "@tailwindcss/oxide-linux-arm64-musl": "4.3.1", "@tailwindcss/oxide-linux-x64-gnu": "4.3.1", "@tailwindcss/oxide-linux-x64-musl": "4.3.1", "@tailwindcss/oxide-wasm32-wasi": "4.3.1", "@tailwindcss/oxide-win32-arm64-msvc": "4.3.1", "@tailwindcss/oxide-win32-x64-msvc": "4.3.1" } }, "sha512-yVPyo8RNkabVr3O2EhHEE0Rewu7YKzc1DhIqfL46LKveFrmu9XbDazNOJY7/GRuvw1h6u3utWnR29H/p5JPlgA=="],
@@ -526,6 +647,8 @@
 
     "@tanstack/virtual-core": ["@tanstack/virtual-core@3.17.1", "", {}, "sha512-VZyW2Uiml5tmBZwPGrSD3Sz73OxzljQMCmzYHsUTPEuTsERf5xwa+uWb01xEzkz3ZSYTjj8NEb/mKHvgKxyZdA=="],
 
+    "@tanstack/vue-virtual": ["@tanstack/vue-virtual@3.13.31", "", { "dependencies": { "@tanstack/virtual-core": "3.17.3" }, "peerDependencies": { "vue": "^2.7.0 || ^3.0.0" } }, "sha512-wZMEoSf852jQqaf3Ika1J7PiBae6341LNy/2CxmIyn0XKDQXMuK41wVX+xp6G0yx8jyR95Ef+Tdr13DK7mbJtQ=="],
+
     "@tauri-apps/api": ["@tauri-apps/api@2.11.0", "", {}, "sha512-7CinYODhky9lmO23xHnUFv0Xt43fbtWMyxZcLcRBlFkcgXKuEirBvHpmtJ89YMhyeGcq20Wuc47Fa4XjyniywA=="],
 
     "@tauri-apps/cli": ["@tauri-apps/cli@2.11.2", "", { "optionalDependencies": { "@tauri-apps/cli-darwin-arm64": "2.11.2", "@tauri-apps/cli-darwin-x64": "2.11.2", "@tauri-apps/cli-linux-arm-gnueabihf": "2.11.2", "@tauri-apps/cli-linux-arm64-gnu": "2.11.2", "@tauri-apps/cli-linux-arm64-musl": "2.11.2", "@tauri-apps/cli-linux-riscv64-gnu": "2.11.2", "@tauri-apps/cli-linux-x64-gnu": "2.11.2", "@tauri-apps/cli-linux-x64-musl": "2.11.2", "@tauri-apps/cli-win32-arm64-msvc": "2.11.2", "@tauri-apps/cli-win32-ia32-msvc": "2.11.2", "@tauri-apps/cli-win32-x64-msvc": "2.11.2" }, "bin": { "tauri": "tauri.js" } }, "sha512-bk3HemqvGRoy+5D/dVMUQHKMYLglD0jVnMm/0iGMH6ufZ+p8r14m6BpIixwij3PBvZdvORUp1YifTD8QxVZ1Nw=="],
@@ -586,18 +709,40 @@
 
     "@types/chai": ["@types/chai@5.2.3", "", { "dependencies": { "@types/deep-eql": "*", "assertion-error": "^2.0.1" } }, "sha512-Mw558oeA9fFbv65/y4mHtXDs9bPnFMZAL/jxdPFUpOHHIXX91mcgEHbS5Lahr+pwZFR8A7GQleRWeI6cGFC2UA=="],
 
+    "@types/debug": ["@types/debug@4.1.13", "", { "dependencies": { "@types/ms": "*" } }, "sha512-KSVgmQmzMwPlmtljOomayoR89W4FynCAi3E8PPs7vmDVPe84hT+vGPKkJfThkmXs0x0jAaa9U8uW8bbfyS2fWw=="],
+
     "@types/deep-eql": ["@types/deep-eql@4.0.2", "", {}, "sha512-c9h9dVVMigMPc4bwTvC5dxqtqJZwQPePsWjPlpSOnojbor6pGqdk541lfA7AqFQr5pB1BRdq0juY9db81BwyFw=="],
 
     "@types/esrecurse": ["@types/esrecurse@4.3.1", "", {}, "sha512-xJBAbDifo5hpffDBuHl0Y8ywswbiAp/Wi7Y/GtAgSlZyIABppyurxVueOPE8LUQOxdlgi6Zqce7uoEpqNTeiUw=="],
 
     "@types/estree": ["@types/estree@1.0.8", "", {}, "sha512-dWHzHa2WqEXI/O1E9OjrocMTKJl2mSrEolh1Iomrv6U+JuNwaHXsXx9bLu5gG7BUWFIN0skIQJQ/L1rIex4X6w=="],
 
+    "@types/har-format": ["@types/har-format@1.2.16", "", {}, "sha512-fluxdy7ryD3MV6h8pTfTYpy/xQzCFC7m89nOH9y94cNqJ1mDIDPut7MnRHI3F6qRmh/cT2fUjG1MLdCNb4hE9A=="],
+
+    "@types/hast": ["@types/hast@3.0.4", "", { "dependencies": { "@types/unist": "*" } }, "sha512-WPs+bbQw5aCj+x6laNGWLH3wviHtoCv/P3+otBhbOhJgG8qtpdAMlTCxLtsTWA7LH1Oh/bFCHsBn0TPS5m30EQ=="],
+
     "@types/json-schema": ["@types/json-schema@7.0.15", "", {}, "sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA=="],
 
+    "@types/mdast": ["@types/mdast@4.0.4", "", { "dependencies": { "@types/unist": "*" } }, "sha512-kGaNbPh1k7AFzgpud/gMdvIm5xuECykRR+JnWKQno9TAXVa6WIVCGTPvYGekIDL4uwCZQSYbUxNBSb1aUo79oA=="],
+
+    "@types/ms": ["@types/ms@2.1.0", "", {}, "sha512-GsCCIZDE/p3i96vtEqx+7dBUGXrc7zeSK3wwPHIaRThS+9OhWIXRqzs4d6k1SVU8g91DrNRWxWUGhp5KXQb2VA=="],
+
+    "@types/node": ["@types/node@24.13.2", "", { "dependencies": { "undici-types": "~7.18.0" } }, "sha512-fRa09kZTgu8o71KFcDjUFuc7F+dEbZYZmkI0mg5YBTRs0yMKjYHsq/c0urDKeDb+D5qVgXOdFcuu+DZPKOITwA=="],
+
     "@types/react": ["@types/react@19.2.17", "", { "dependencies": { "csstype": "^3.2.2" } }, "sha512-MXfmqaVPEVgkBT/aY0aGCkRWWtByiYQXo3xdQ8r5RzuFrPiRn8Gar2tQdXSUQ2GKV3bkXckek89V8wQBY2Q/Aw=="],
 
     "@types/react-dom": ["@types/react-dom@19.2.3", "", { "peerDependencies": { "@types/react": "^19.2.0" } }, "sha512-jp2L/eY6fn+KgVVQAOqYItbF0VY/YApe5Mz2F0aykSO8gx31bYCZyvSeYxCHKvzHG5eZjc+zyaS5BrBWya2+kQ=="],
 
+    "@types/unist": ["@types/unist@3.0.3", "", {}, "sha512-ko/gIFJRv177XgZsZcBwnqJN5x/Gien8qNOn0D5bQU/zAzVf9Zt3BlcUiLqhV9y4ARk0GbT3tnUiPNgnTXzc/Q=="],
+
+    "@types/web-bluetooth": ["@types/web-bluetooth@0.0.21", "", {}, "sha512-oIQLCGWtcFZy2JW77j9k8nHzAOpqMHLQejDA48XXMWH6tjCQHz5RCFz1bzsmROyL6PUm+LLnUiI4BCn221inxA=="],
+
+    "@ungap/structured-clone": ["@ungap/structured-clone@1.3.2", "", {}, "sha512-5jsZFwgR5rTdKwidH9Qmat75RKwqfpKlWWB1frDkljN127mwqBu8K0PYo7/hFpF03IEJpfVPpCQDY/eDx3iHvA=="],
+
+    "@unhead/vue": ["@unhead/vue@2.1.15", "", { "dependencies": { "hookable": "^6.0.1", "unhead": "2.1.15" }, "peerDependencies": { "vue": ">=3.5.18" } }, "sha512-SSByXfEjhzPn8gXdEdgpYqpLMPSkLUH2HVE0GxZfOtNsJ0GgOHQs0g9T67ZZ1z0kTELLKdtOtYrzrbv9+ffF7g=="],
+
+    "@vercel/oidc": ["@vercel/oidc@3.1.0", "", {}, "sha512-Fw28YZpRnA3cAHHDlkt7xQHiJ0fcL+NRcIqsocZQUSmbzeIKRpwttJjik5ZGanXP+vlA4SbTg+AbA3bP363l+w=="],
+
     "@vitejs/plugin-react": ["@vitejs/plugin-react@6.0.2", "", { "dependencies": { "@rolldown/pluginutils": "^1.0.0" }, "peerDependencies": { "@rolldown/plugin-babel": "^0.1.7 || ^0.2.0", "babel-plugin-react-compiler": "^1.0.0", "vite": "^8.0.0" }, "optionalPeers": ["@rolldown/plugin-babel", "babel-plugin-react-compiler"] }, "sha512-DlSMqo4WhThw4vB8Mpn0Woe9J+Jfq1geJ61AKW0QEgLzGMNwtIMdxbDUzLxcun8W7NbJO0e2Jg/Nxm3cCSVzzg=="],
 
     "@vitest/expect": ["@vitest/expect@4.1.9", "", { "dependencies": { "@standard-schema/spec": "^1.1.0", "@types/chai": "^5.2.2", "@vitest/spy": "4.1.9", "@vitest/utils": "4.1.9", "chai": "^6.2.2", "tinyrainbow": "^3.1.0" } }, "sha512-vl/rYsUKcBr3SnQn166+XR5ZQcgMx3DQhFWdfli/cWpLnLUmbxZvyrJZotLFUryib+LtArYMSTJ5RbQ57ZqrlA=="],
@@ -614,12 +759,40 @@
 
     "@vitest/utils": ["@vitest/utils@4.1.9", "", { "dependencies": { "@vitest/pretty-format": "4.1.9", "convert-source-map": "^2.0.0", "tinyrainbow": "^3.1.0" } }, "sha512-A51o8ymO5PpqlWNnBP9ZHPXDIpuMtTLlGSjN7la4US+LJzoUMyhwjA5QXlm39JexgwHKW4Xjs8Z2d3dLCXOeuA=="],
 
+    "@vue/compiler-core": ["@vue/compiler-core@3.5.39", "", { "dependencies": { "@babel/parser": "^7.29.7", "@vue/shared": "3.5.39", "entities": "^7.0.1", "estree-walker": "^2.0.2", "source-map-js": "^1.2.1" } }, "sha512-16KBTEXAJCpDr0mwlw+AZyhu8iyC7R3S2vBwsI7QnWJU6X3WKc9VKeNEZpiMdZ569qWhz9574L3vV55qRL0Vtw=="],
+
+    "@vue/compiler-dom": ["@vue/compiler-dom@3.5.39", "", { "dependencies": { "@vue/compiler-core": "3.5.39", "@vue/shared": "3.5.39" } }, "sha512-oQPigALqYbNxTNPvNgSOe+czwVExfbVF02lz8jP0S3AXJiu3jxYDygNUiqSep4ezzW8XgnubqH63My2A7JR/vg=="],
+
+    "@vue/compiler-sfc": ["@vue/compiler-sfc@3.5.39", "", { "dependencies": { "@babel/parser": "^7.29.7", "@vue/compiler-core": "3.5.39", "@vue/compiler-dom": "3.5.39", "@vue/compiler-ssr": "3.5.39", "@vue/shared": "3.5.39", "estree-walker": "^2.0.2", "magic-string": "^0.30.21", "postcss": "^8.5.15", "source-map-js": "^1.2.1" } }, "sha512-d0ki86iOyN8LoZPBmk5SJWNwHP19CnDDCfuo//+2WJa2g5Ke0Jay983PIBIcSSzldC68I8DrD5GrHV3OSDfodg=="],
+
+    "@vue/compiler-ssr": ["@vue/compiler-ssr@3.5.39", "", { "dependencies": { "@vue/compiler-dom": "3.5.39", "@vue/shared": "3.5.39" } }, "sha512-Ce7/wvwMHai74bdszfXExdazFigYnlF9zgCmEQUcM1j0fOymlouZ7XilTYNo8oUjhlnjYOZbGrcYKuqjz89Ucw=="],
+
+    "@vue/reactivity": ["@vue/reactivity@3.5.39", "", { "dependencies": { "@vue/shared": "3.5.39" } }, "sha512-TpsuBJ9gGlZa5d23XcM2y8EXanz9dZeVDQBXRwzy46ItgvM+rWpzs+UVM0wcRLxGvcav0HE5jz2gNL53xlRAog=="],
+
+    "@vue/runtime-core": ["@vue/runtime-core@3.5.39", "", { "dependencies": { "@vue/reactivity": "3.5.39", "@vue/shared": "3.5.39" } }, "sha512-9GLtNyRvPAUMbX+7ono0RC2j0guo2LXVi8LvcmAooImACUKm0oFf0jjwbX8/H0AE/t1nxhAkn8RSl9PMCzzxZw=="],
+
+    "@vue/runtime-dom": ["@vue/runtime-dom@3.5.39", "", { "dependencies": { "@vue/reactivity": "3.5.39", "@vue/runtime-core": "3.5.39", "@vue/shared": "3.5.39", "csstype": "^3.2.3" } }, "sha512-7Y6aAGboKcXAZ3ECuUy7RrS5yy2r47dhTp2SKaJmYxjopImaVFaNa5Ne66NwGovsrxVAl5S5rwc7m22UG7Lmww=="],
+
+    "@vue/server-renderer": ["@vue/server-renderer@3.5.39", "", { "dependencies": { "@vue/compiler-ssr": "3.5.39", "@vue/shared": "3.5.39" }, "peerDependencies": { "vue": "3.5.39" } }, "sha512-yZSakiAGw85rZfG7UM8akMnIF+FmeiNk47uvHf2nVBBSe+dIKUhZuZq9+XgJhbV3nS5Z4ALH23/MpXofW+mbcw=="],
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+    "@vue/shared": ["@vue/shared@3.5.39", "", {}, "sha512-l1rrBtBfTnmxvtsvdQDXltUUy8S1Y+ZaqdfUzmAnJkTd8Z8rv5v/ytW+TKiqEOWyHPoqtPlNFSs0lhRmYVSHVA=="],
+
+    "@vueuse/core": ["@vueuse/core@13.9.0", "", { "dependencies": { "@types/web-bluetooth": "^0.0.21", "@vueuse/metadata": "13.9.0", "@vueuse/shared": "13.9.0" }, "peerDependencies": { "vue": "^3.5.0" } }, "sha512-ts3regBQyURfCE2BcytLqzm8+MmLlo5Ln/KLoxDVcsZ2gzIwVNnQpQOL/UKV8alUqjSZOlpFZcRNsLRqj+OzyA=="],
+
+    "@vueuse/integrations": ["@vueuse/integrations@13.9.0", "", { "dependencies": { "@vueuse/core": "13.9.0", "@vueuse/shared": "13.9.0" }, "peerDependencies": { "async-validator": "^4", "axios": "^1", "change-case": "^5", "drauu": "^0.4", "focus-trap": "^7", "fuse.js": "^7", "idb-keyval": "^6", "jwt-decode": "^4", "nprogress": "^0.2", "qrcode": "^1.5", "sortablejs": "^1", "universal-cookie": "^7 || ^8", "vue": "^3.5.0" }, "optionalPeers": ["async-validator", "axios", "change-case", "drauu", "focus-trap", "fuse.js", "idb-keyval", "jwt-decode", "nprogress", "qrcode", "sortablejs", "universal-cookie"] }, "sha512-SDobKBbPIOe0cVL7QxMzGkuUGHvWTdihi9zOrrWaWUgFKe15cwEcwfWmgrcNzjT6kHnNmWuTajPHoIzUjYNYYQ=="],
+
+    "@vueuse/metadata": ["@vueuse/metadata@13.9.0", "", {}, "sha512-1AFRvuiGphfF7yWixZa0KwjYH8ulyjDCC0aFgrGRz8+P4kvDFSdXLVfTk5xAN9wEuD1J6z4/myMoYbnHoX07zg=="],
+
+    "@vueuse/shared": ["@vueuse/shared@13.9.0", "", { "peerDependencies": { "vue": "^3.5.0" } }, "sha512-e89uuTLMh0U5cZ9iDpEI2senqPGfbPRTHM/0AaQkcxnpqjkZqDYP8rpfm7edOz8s+pOCOROEy1PIveSW8+fL5g=="],
+
     "acorn": ["acorn@8.16.0", "", { "bin": { "acorn": "bin/acorn" } }, "sha512-UVJyE9MttOsBQIDKw1skb9nAwQuR5wuGD3+82K6JgJlm/Y+KI92oNsMNGZCYdDsVtRHSak0pcV5Dno5+4jh9sw=="],
 
     "acorn-jsx": ["acorn-jsx@5.3.2", "", { "peerDependencies": { "acorn": "^6.0.0 || ^7.0.0 || ^8.0.0" } }, "sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ=="],
 
     "agent-base": ["agent-base@6.0.2", "", { "dependencies": { "debug": "4" } }, "sha512-RZNwNclF7+MS/8bDg70amg32dyeZGZxiDuQmZxKLAlQjr3jGyLx+4Kkk58UO7D2QdgFIQCovuSuZESne6RG6XQ=="],
 
+    "ai": ["ai@6.0.33", "", { "dependencies": { "@ai-sdk/gateway": "3.0.13", "@ai-sdk/provider": "3.0.2", "@ai-sdk/provider-utils": "4.0.5", "@opentelemetry/api": "1.9.0" }, "peerDependencies": { "zod": "^3.25.76 || ^4.1.8" } }, "sha512-bVokbmy2E2QF6Efl+5hOJx5MRWoacZ/CZY/y1E+VcewknvGlgaiCzMu8Xgddz6ArFJjiMFNUPHKxAhIePE4rmg=="],
+
     "ajv": ["ajv@6.14.0", "", { "dependencies": { "fast-deep-equal": "^3.1.1", "fast-json-stable-stringify": "^2.0.0", "json-schema-traverse": "^0.4.1", "uri-js": "^4.2.2" } }, "sha512-IWrosm/yrn43eiKqkfkHis7QioDleaXQHdDVPKg0FSwwd/DuvyX79TZnFOnYpB7dcsFAMmtFztZuXPDvSePkFw=="],
 
     "ansi-regex": ["ansi-regex@5.0.1", "", {}, "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ=="],
@@ -636,6 +809,8 @@
 
     "axios": ["axios@1.16.1", "", { "dependencies": { "follow-redirects": "^1.16.0", "form-data": "^4.0.5", "https-proxy-agent": "^5.0.1", "proxy-from-env": "^2.1.0" } }, "sha512-caYkukvroVPO8KrzuJEb50Hm07KwfBZPEC3VeFHTsqWHvKTsy54hjJz9BS/cdaypROE2rH6xvm9mHX4fgWkr3A=="],
 
+    "bail": ["bail@2.0.2", "", {}, "sha512-0xO6mYd7JB2YesxDKplafRpsiOzPt9V02ddPCLbY1xYGPOX24NTyN50qnUxgCPcSoYMhKpAuBTjQoRZCAkUDRw=="],
+
     "balanced-match": ["balanced-match@4.0.4", "", {}, "sha512-BLrgEcRTwX2o6gGxGOCNyMvGSp35YofuYzw9h1IMTRmKqttAZZVU67bdb9Pr2vUHA8+j3i2tJfjO6C6+4myGTA=="],
 
     "baseline-browser-mapping": ["baseline-browser-mapping@2.10.17", "", { "bin": { "baseline-browser-mapping": "dist/cli.cjs" } }, "sha512-HdrkN8eVG2CXxeifv/VdJ4A4RSra1DTW8dc/hdxzhGHN8QePs6gKaWM9pHPcpCoxYZJuOZ8drHmbdpLHjCYjLA=="],
@@ -654,10 +829,18 @@
 
     "caniuse-lite": ["caniuse-lite@1.0.30001787", "", {}, "sha512-mNcrMN9KeI68u7muanUpEejSLghOKlVhRqS/Za2IeyGllJ9I9otGpR9g3nsw7n4W378TE/LyIteA0+/FOZm4Kg=="],
 
+    "ccount": ["ccount@2.0.1", "", {}, "sha512-eyrF0jiFpY+3drT6383f1qhkbGsLSifNAjA61IUjZjmLCWjItY6LB9ft9YhoDgwfmclB2zhu51Lc7+95b8NRAg=="],
+
     "chai": ["chai@6.2.2", "", {}, "sha512-NUPRluOfOiTKBKvWPtSD4PhFvWCqOi0BGStNWs57X9js7XGTprSmFoz5F0tWhR4WPjNeR9jXqdC7/UpSJTnlRg=="],
 
     "chalk": ["chalk@4.1.2", "", { "dependencies": { "ansi-styles": "^4.1.0", "supports-color": "^7.1.0" } }, "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA=="],
 
+    "character-entities": ["character-entities@2.0.2", "", {}, "sha512-shx7oQ0Awen/BRIdkjkvz54PnEEI/EjwXDSIZp86/KKdbafHh1Df/RYGBhn4hbe2+uKC9FnT5UCEdyPz3ai9hQ=="],
+
+    "character-entities-html4": ["character-entities-html4@2.1.0", "", {}, "sha512-1v7fgQRj6hnSwFpq1Eu0ynr/CDEw0rXo2B61qXrLNdHZmPKgb7fqS1a2JwF0rISo9q77jDI8VMEHoApn8qDoZA=="],
+
+    "character-entities-legacy": ["character-entities-legacy@3.0.0", "", {}, "sha512-RpPp0asT/6ufRm//AJVwpViZbGM/MkjQFxJccQRHmISF/22NBtsHqAWmL+/pmkPWoIUJdWyeVleTl1wydHATVQ=="],
+
     "class-variance-authority": ["class-variance-authority@0.7.1", "", { "dependencies": { "clsx": "^2.1.1" } }, "sha512-Ka+9Trutv7G8M6WT6SeiRWz792K5qEqIGEGzXKhAE6xOWAY6pPH8U+9IY3oCMv6kqTmLsv7Xh/2w2RigkePMsg=="],
 
     "cliui": ["cliui@8.0.1", "", { "dependencies": { "string-width": "^4.2.0", "strip-ansi": "^6.0.1", "wrap-ansi": "^7.0.0" } }, "sha512-BSeNnyus75C4//NQ9gQt1/csTXyo/8Sb+afLAkzAptFuMsod9HFokGNudZpi/oQV73hnVK+sR+5PVRMd+Dr7YQ=="],
@@ -670,12 +853,18 @@
 
     "combined-stream": ["combined-stream@1.0.8", "", { "dependencies": { "delayed-stream": "~1.0.0" } }, "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg=="],
 
+    "comma-separated-tokens": ["comma-separated-tokens@2.0.3", "", {}, "sha512-Fu4hJdvzeylCfQPp9SGWidpzrMs7tTrlu6Vb8XGaRGck8QSNZJJp538Wrb60Lax4fPwR64ViY468OIUTbRlGZg=="],
+
     "concurrently": ["concurrently@9.2.1", "", { "dependencies": { "chalk": "4.1.2", "rxjs": "7.8.2", "shell-quote": "1.8.3", "supports-color": "8.1.1", "tree-kill": "1.2.2", "yargs": "17.7.2" }, "bin": { "conc": "dist/bin/concurrently.js", "concurrently": "dist/bin/concurrently.js" } }, "sha512-fsfrO0MxV64Znoy8/l1vVIjjHa29SZyyqPgQBwhiDcaW8wJc2W3XWVOGx4M3oJBnv/zdUZIIp1gDeS98GzP8Ng=="],
 
+    "convert-hrtime": ["convert-hrtime@5.0.0", "", {}, "sha512-lOETlkIeYSJWcbbcvjRKGxVMXJR+8+OQb/mTPbA4ObPMytYIsUbuOE0Jzy60hjARYszq1id0j8KgVhC+WGZVTg=="],
+
     "convert-source-map": ["convert-source-map@2.0.0", "", {}, "sha512-Kvp459HrV2FEJ1CAsi1Ku+MY3kasH19TFykTz2xWmMeq6bk2NU3XXvfJ+Q61m0xktWwt+1HSYf3JZsTms3aRJg=="],
 
     "country-flag-icons": ["country-flag-icons@1.6.17", "", {}, "sha512-Nmik0289ZVZSI3c7mJR/amg6DyY7Z59b0sTFSKayeX72mHfPzCPJygwJs2pYgQULzuAyWeCUgwAJ+Dq8OR+JFw=="],
 
+    "crelt": ["crelt@1.0.7", "", {}, "sha512-aK6BbWfhf4U/wCcLHKPJl/xa6VkVstRaPywWtMKGwuOLc/wZTyQYuoxgvZnNsBvv7Kg3YTBQYYBCggcviQczuA=="],
+
     "cross-spawn": ["cross-spawn@7.0.6", "", { "dependencies": { "path-key": "^3.1.0", "shebang-command": "^2.0.0", "which": "^2.0.1" } }, "sha512-uV2QOWP2nWzsy2aMp8aRibhi9dlzF5Hgh5SHaB9OiTGEyDTiJJyx0uy51QXdyWbtAHNua4XJzUKca3OzKUd3vA=="],
 
     "css-tree": ["css-tree@3.2.1", "", { "dependencies": { "mdn-data": "2.27.1", "source-map-js": "^1.2.1" } }, "sha512-X7sjQzceUhu1u7Y/ylrRZFU2FS6LRiFVp6rKLPg23y3x3c3DOKAwuXGDp+PAGjh6CSnCjYeAul8pcT8bAl+lSA=="],
@@ -684,6 +873,8 @@
 
     "csstype": ["csstype@3.2.3", "", {}, "sha512-z1HGKcYy2xA8AGQfwrn0PAy+PB7X/GSj3UVJW9qKyn43xWa+gl5nXmU4qqLMRzWVLFC8KusUX8T/0kCiOYpAIQ=="],
 
+    "cva": ["cva@1.0.0-beta.4", "", { "dependencies": { "clsx": "^2.1.1" }, "peerDependencies": { "typescript": ">= 4.5.5" }, "optionalPeers": ["typescript"] }, "sha512-F/JS9hScapq4DBVQXcK85l9U91M6ePeXoBMSp7vypzShoefUBxjQTo3g3935PUHgQd+IW77DjbPRIxugy4/GCQ=="],
+
     "data-urls": ["data-urls@7.0.0", "", { "dependencies": { "whatwg-mimetype": "^5.0.0", "whatwg-url": "^16.0.0" } }, "sha512-23XHcCF+coGYevirZceTVD7NdJOqVn+49IHyxgszm+JIiHLoB2TkmPtsYkNWT1pvRSGkc35L6NHs0yHkN2SumA=="],
 
     "debug": ["debug@4.4.3", "", { "dependencies": { "ms": "^2.1.3" } }, "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA=="],
@@ -692,6 +883,8 @@
 
     "decimal.js": ["decimal.js@10.6.0", "", {}, "sha512-YpgQiITW3JXGntzdUmyUR1V812Hn8T1YVXhCu+wO3OpS4eU9l4YdD3qjyiKdV6mvV29zapkMeD390UVEf2lkUg=="],
 
+    "decode-named-character-reference": ["decode-named-character-reference@1.3.0", "", { "dependencies": { "character-entities": "^2.0.0" } }, "sha512-GtpQYB283KrPp6nRw50q3U9/VfOutZOe103qlN7BPP6Ad27xYnOIWv4lPzo8HCAL+mMZofJ9KEy30fq6MfaK6Q=="],
+
     "deep-is": ["deep-is@0.1.4", "", {}, "sha512-oIPzksmTg4/MriiaYGO+okXDT7ztn/w3Eptv/+gSIdMdKsJo0u4CfYNFJPy+4SKMuCqGw2wxnA+URMg3t8a/bQ=="],
 
     "defu": ["defu@6.1.7", "", {}, "sha512-7z22QmUWiQ/2d0KkdYmANbRUVABpZ9SNYyH5vx6PZ+nE5bcC0l7uFvEfHlyld/HcGBFTL536ClDt3DEcSlEJAQ=="],
@@ -706,6 +899,8 @@
 
     "detect-node-es": ["detect-node-es@1.1.0", "", {}, "sha512-ypdmJU/TbBby2Dxibuv7ZLW3Bs1QEmM7nHjEANfohJLvE0XVujisn1qPJcZxg+qDucsr+bP6fLD1rPS3AhJ7EQ=="],
 
+    "devlop": ["devlop@1.1.0", "", { "dependencies": { "dequal": "^2.0.0" } }, "sha512-RWmIqhcFf1lRYBvNmr7qTNuyCt/7/ns2jbpp1+PalgE/rDQcBT0fioSMUpJ93irlUhC5hrg4cYqe6U+0ImW0rA=="],
+
     "dijkstrajs": ["dijkstrajs@1.0.3", "", {}, "sha512-qiSlmBq9+BCdCA/L46dw8Uy93mloxsPSbwnm5yrKn2vMPiy8KyAskTF6zuV/j5BMsmOGZDPs7KjU+mjb670kfA=="],
 
     "dom-accessibility-api": ["dom-accessibility-api@0.6.3", "", {}, "sha512-7ZgogeTnjuHbo+ct10G9Ffp0mif17idi0IyWNVA/wcwcm7NPOD/WEHVP3n7n3MhXqxoIYm8d6MuZohYWIZ4T3w=="],
@@ -754,10 +949,14 @@
 
     "esutils": ["esutils@2.0.3", "", {}, "sha512-kVscqXk4OCp68SZ0dkgEKVi6/8ij300KBWTJq32P/dYeWTSwK41WyTxalN1eRmA5Z9UU/LX9D7FWSmV9SAYx6g=="],
 
+    "eventsource-parser": ["eventsource-parser@3.1.0", "", {}, "sha512-kJezFj9YFAMLeORyi7aCLxLbD5/qWMQnoMVlVPyHIll7lgRJCc3JVln9Vgl9nwQi0YkMnhdGTMNn7CkRRAptMg=="],
+
     "execa": ["execa@9.6.1", "", { "dependencies": { "@sindresorhus/merge-streams": "^4.0.0", "cross-spawn": "^7.0.6", "figures": "^6.1.0", "get-stream": "^9.0.0", "human-signals": "^8.0.1", "is-plain-obj": "^4.1.0", "is-stream": "^4.0.1", "npm-run-path": "^6.0.0", "pretty-ms": "^9.2.0", "signal-exit": "^4.1.0", "strip-final-newline": "^4.0.0", "yoctocolors": "^2.1.1" } }, "sha512-9Be3ZoN4LmYR90tUoVu2te2BsbzHfhJyfEiAVfz7N5/zv+jduIfLrV2xdQXOHbaD6KgpGdO9PRPM1Y4Q9QkPkA=="],
 
     "expect-type": ["expect-type@1.3.0", "", {}, "sha512-knvyeauYhqjOYvQ66MznSMs83wmHrCycNEN6Ao+2AeYEfxUIkuiVxdEa1qlGEPK+We3n0THiDciYSsCcgW/DoA=="],
 
+    "extend": ["extend@3.0.2", "", {}, "sha512-fjquC59cD7CyW6urNXK0FBufkZcoiGG80wTuPujX590cB5Ttln20E2UB4S/WARVqhXffZl2LNgS+gQdPIIim/g=="],
+
     "fast-deep-equal": ["fast-deep-equal@3.1.3", "", {}, "sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q=="],
 
     "fast-json-stable-stringify": ["fast-json-stable-stringify@2.1.0", "", {}, "sha512-lhd/wF+Lk98HZoTCtlVraHtfh5XYijIjalXck7saUtuanSDyLMxnHhSXEDJqHxD7msR8D0uCmqlkwjCV8xvwHw=="],
@@ -778,6 +977,8 @@
 
     "flatted": ["flatted@3.4.2", "", {}, "sha512-PjDse7RzhcPkIJwy5t7KPWQSZ9cAbzQXcafsetQoD7sOJRQlGikNbx7yZp2OotDnJyrDcbyRq3Ttb18iYOqkxA=="],
 
+    "focus-trap": ["focus-trap@7.8.0", "", { "dependencies": { "tabbable": "^6.4.0" } }, "sha512-/yNdlIkpWbM0ptxno3ONTuf+2g318kh2ez3KSeZN5dZ8YC6AAmgeWz+GasYYiBJPFaYcSAPeu4GfhUaChzIJXA=="],
+
     "follow-redirects": ["follow-redirects@1.16.0", "", {}, "sha512-y5rN/uOsadFT/JfYwhxRS5R7Qce+g3zG97+JrtFZlC9klX/W5hD7iiLzScI4nZqUS7DNUdhPgw4xI8W2LuXlUw=="],
 
     "form-data": ["form-data@4.0.5", "", { "dependencies": { "asynckit": "^0.4.0", "combined-stream": "^1.0.8", "es-set-tostringtag": "^2.1.0", "hasown": "^2.0.2", "mime-types": "^2.1.12" } }, "sha512-8RipRLol37bNs2bhoV67fiTEvdTrbMUYcFTiy3+wuuOnUog2QBHCZWXDRijWQfAkhBj2Uf5UnVaiWwA5vdd82w=="],
@@ -788,6 +989,10 @@
 
     "function-bind": ["function-bind@1.1.2", "", {}, "sha512-7XHNxH7qX9xG5mIwxkhumTox/MIRNcOgDrxWsMt2pAr23WHp6MrRlN7FBSFpCpr+oVO0F744iUgR82nJMfG2SA=="],
 
+    "function-timeout": ["function-timeout@1.0.2", "", {}, "sha512-939eZS4gJ3htTHAldmyyuzlrD58P03fHG49v2JfFXbV6OhvZKRC9j2yAtdHw/zrp2zXHuv05zMIy40F0ge7spA=="],
+
+    "fuse.js": ["fuse.js@7.4.2", "", {}, "sha512-LVbzjD4WA6UP5B1UnP8wuaXJiLnqMdM/E4fiJXTJ5haJ5b/MBNsK29h2fm6swEoQaVQjvYFWKLE2RanyZIoRVQ=="],
+
     "fzf": ["fzf@0.5.2", "", {}, "sha512-Tt4kuxLXFKHy8KT40zwsUPUkg1CrsgY25FxA2U/j/0WgEDCk3ddc/zLTCCcbSHX9FcKtLuVaDGtGE/STWC+j3Q=="],
 
     "gensync": ["gensync@1.0.0-beta.2", "", {}, "sha512-3hN7NaskYvMDLQY55gnW3NQ+mesEAepTqlg+VEbj7zzqEMBVNhzcGYYeqFo/TlYz6eQiFcp1HcsCZO+nGgS8zg=="],
@@ -798,6 +1003,8 @@
 
     "get-nonce": ["get-nonce@1.0.1", "", {}, "sha512-FJhYRoDaiatfEkUK8HKlicmu/3SGFD51q3itKDGoSTysQJBnfOcxU5GxnhE1E6soB76MbT0MBtnKJuXyAx+96Q=="],
 
+    "get-own-enumerable-keys": ["get-own-enumerable-keys@1.0.0", "", {}, "sha512-PKsK2FSrQCyxcGHsGrLDcK0lx+0Ke+6e8KFFozA9/fIQLhQzPaRvJFdcz7+Axg3jUH/Mq+NI4xa5u/UT2tQskA=="],
+
     "get-proto": ["get-proto@1.0.1", "", { "dependencies": { "dunder-proto": "^1.0.1", "es-object-atoms": "^1.0.0" } }, "sha512-sTSfBjoXBp89JvIKIefqw7U2CCebsc74kiY6awiGogKtoSGbgjYE/G/+l9sF3MWFPNc9IcoOC4ODfKHfxFmp0g=="],
 
     "get-stream": ["get-stream@9.0.1", "", { "dependencies": { "@sec-ant/readable-stream": "^0.4.1", "is-stream": "^4.0.1" } }, "sha512-kVCxPF3vQM/N0B1PmoqVUqgHP+EeVjmZSQn+1oCRPxd2P21P2F19lIgbR3HBosbB1PUhOAoctJnfEn2GbN2eZA=="],
@@ -816,6 +1023,8 @@
 
     "graceful-fs": ["graceful-fs@4.2.11", "", {}, "sha512-RbJ5/jmFcNNCcDV5o9eTnBLJ/HszWV0P73bc+Ff4nS/rJj+YaS6IGyiOL0VoBYX+l1Wrl3k63h/KrH+nhJ0XvQ=="],
 
+    "guess-json-indent": ["guess-json-indent@3.0.1", "", {}, "sha512-LWZ3Vr8BG7DHE3TzPYFqkhjNRw4vYgFSsv2nfMuHklAlOfiy54/EwiDQuQfFVLxENCVv20wpbjfTayooQHrEhQ=="],
+
     "has-flag": ["has-flag@4.0.0", "", {}, "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ=="],
 
     "has-symbols": ["has-symbols@1.1.0", "", {}, "sha512-1cDNdwJ2Jaohmb3sg4OmKaMBwuC48sYni5HUw2DvsC8LjGTLK9h+eb1X6RyuOHe4hT0ULCW68iomhjUoKUqlPQ=="],
@@ -824,14 +1033,56 @@
 
     "hasown": ["hasown@2.0.3", "", { "dependencies": { "function-bind": "^1.1.2" } }, "sha512-ej4AhfhfL2Q2zpMmLo7U1Uv9+PyhIZpgQLGT1F9miIGmiCJIoCgSmczFdrc97mWT4kVY72KA+WnnhJ5pghSvSg=="],
 
+    "hast-util-embedded": ["hast-util-embedded@3.0.0", "", { "dependencies": { "@types/hast": "^3.0.0", "hast-util-is-element": "^3.0.0" } }, "sha512-naH8sld4Pe2ep03qqULEtvYr7EjrLK2QHY8KJR6RJkTUjPGObe1vnx585uzem2hGra+s1q08DZZpfgDVYRbaXA=="],
+
+    "hast-util-format": ["hast-util-format@1.1.0", "", { "dependencies": { "@types/hast": "^3.0.0", "hast-util-embedded": "^3.0.0", "hast-util-minify-whitespace": "^1.0.0", "hast-util-phrasing": "^3.0.0", "hast-util-whitespace": "^3.0.0", "html-whitespace-sensitive-tag-names": "^3.0.0", "unist-util-visit-parents": "^6.0.0" } }, "sha512-yY1UDz6bC9rDvCWHpx12aIBGRG7krurX0p0Fm6pT547LwDIZZiNr8a+IHDogorAdreULSEzP82Nlv5SZkHZcjA=="],
+
+    "hast-util-from-html": ["hast-util-from-html@2.0.3", "", { "dependencies": { "@types/hast": "^3.0.0", "devlop": "^1.1.0", "hast-util-from-parse5": "^8.0.0", "parse5": "^7.0.0", "vfile": "^6.0.0", "vfile-message": "^4.0.0" } }, "sha512-CUSRHXyKjzHov8yKsQjGOElXy/3EKpyX56ELnkHH34vDVw1N1XSQ1ZcAvTyAPtGqLTuKP/uxM+aLkSPqF/EtMw=="],
+
+    "hast-util-from-parse5": ["hast-util-from-parse5@8.0.3", "", { "dependencies": { "@types/hast": "^3.0.0", "@types/unist": "^3.0.0", "devlop": "^1.0.0", "hastscript": "^9.0.0", "property-information": "^7.0.0", "vfile": "^6.0.0", "vfile-location": "^5.0.0", "web-namespaces": "^2.0.0" } }, "sha512-3kxEVkEKt0zvcZ3hCRYI8rqrgwtlIOFMWkbclACvjlDw8Li9S2hk/d51OI0nr/gIpdMHNepwgOKqZ/sy0Clpyg=="],
+
+    "hast-util-has-property": ["hast-util-has-property@3.0.0", "", { "dependencies": { "@types/hast": "^3.0.0" } }, "sha512-MNilsvEKLFpV604hwfhVStK0usFY/QmM5zX16bo7EjnAEGofr5YyI37kzopBlZJkHD4t887i+q/C8/tr5Q94cA=="],
+
+    "hast-util-is-body-ok-link": ["hast-util-is-body-ok-link@3.0.1", "", { "dependencies": { "@types/hast": "^3.0.0" } }, "sha512-0qpnzOBLztXHbHQenVB8uNuxTnm/QBFUOmdOSsEn7GnBtyY07+ENTWVFBAnXd/zEgd9/SUG3lRY7hSIBWRgGpQ=="],
+
+    "hast-util-is-element": ["hast-util-is-element@3.0.0", "", { "dependencies": { "@types/hast": "^3.0.0" } }, "sha512-Val9mnv2IWpLbNPqc/pUem+a7Ipj2aHacCwgNfTiK0vJKl0LF+4Ba4+v1oPHFpf3bLYmreq0/l3Gud9S5OH42g=="],
+
+    "hast-util-minify-whitespace": ["hast-util-minify-whitespace@1.0.1", "", { "dependencies": { "@types/hast": "^3.0.0", "hast-util-embedded": "^3.0.0", "hast-util-is-element": "^3.0.0", "hast-util-whitespace": "^3.0.0", "unist-util-is": "^6.0.0" } }, "sha512-L96fPOVpnclQE0xzdWb/D12VT5FabA7SnZOUMtL1DbXmYiHJMXZvFkIZfiMmTCNJHUeO2K9UYNXoVyfz+QHuOw=="],
+
+    "hast-util-parse-selector": ["hast-util-parse-selector@4.0.0", "", { "dependencies": { "@types/hast": "^3.0.0" } }, "sha512-wkQCkSYoOGCRKERFWcxMVMOcYE2K1AaNLU8DXS9arxnLOUEWbOXKXiJUNzEpqZ3JOKpnha3jkFrumEjVliDe7A=="],
+
+    "hast-util-phrasing": ["hast-util-phrasing@3.0.1", "", { "dependencies": { "@types/hast": "^3.0.0", "hast-util-embedded": "^3.0.0", "hast-util-has-property": "^3.0.0", "hast-util-is-body-ok-link": "^3.0.0", "hast-util-is-element": "^3.0.0" } }, "sha512-6h60VfI3uBQUxHqTyMymMZnEbNl1XmEGtOxxKYL7stY2o601COo62AWAYBQR9lZbYXYSBoxag8UpPRXK+9fqSQ=="],
+
+    "hast-util-raw": ["hast-util-raw@9.1.0", "", { "dependencies": { "@types/hast": "^3.0.0", "@types/unist": "^3.0.0", "@ungap/structured-clone": "^1.0.0", "hast-util-from-parse5": "^8.0.0", "hast-util-to-parse5": "^8.0.0", "html-void-elements": "^3.0.0", "mdast-util-to-hast": "^13.0.0", "parse5": "^7.0.0", "unist-util-position": "^5.0.0", "unist-util-visit": "^5.0.0", "vfile": "^6.0.0", "web-namespaces": "^2.0.0", "zwitch": "^2.0.0" } }, "sha512-Y8/SBAHkZGoNkpzqqfCldijcuUKh7/su31kEBp67cFY09Wy0mTRgtsLYsiIxMJxlu0f6AA5SUTbDR8K0rxnbUw=="],
+
+    "hast-util-sanitize": ["hast-util-sanitize@5.0.2", "", { "dependencies": { "@types/hast": "^3.0.0", "@ungap/structured-clone": "^1.0.0", "unist-util-position": "^5.0.0" } }, "sha512-3yTWghByc50aGS7JlGhk61SPenfE/p1oaFeNwkOOyrscaOkMGrcW9+Cy/QAIOBpZxP1yqDIzFMR0+Np0i0+usg=="],
+
+    "hast-util-to-html": ["hast-util-to-html@9.0.5", "", { "dependencies": { "@types/hast": "^3.0.0", "@types/unist": "^3.0.0", "ccount": "^2.0.0", "comma-separated-tokens": "^2.0.0", "hast-util-whitespace": "^3.0.0", "html-void-elements": "^3.0.0", "mdast-util-to-hast": "^13.0.0", "property-information": "^7.0.0", "space-separated-tokens": "^2.0.0", "stringify-entities": "^4.0.0", "zwitch": "^2.0.4" } }, "sha512-OguPdidb+fbHQSU4Q4ZiLKnzWo8Wwsf5bZfbvu7//a9oTYoqD/fWpe96NuHkoS9h0ccGOTe0C4NGXdtS0iObOw=="],
+
+    "hast-util-to-parse5": ["hast-util-to-parse5@8.0.1", "", { "dependencies": { "@types/hast": "^3.0.0", "comma-separated-tokens": "^2.0.0", "devlop": "^1.0.0", "property-information": "^7.0.0", "space-separated-tokens": "^2.0.0", "web-namespaces": "^2.0.0", "zwitch": "^2.0.0" } }, "sha512-MlWT6Pjt4CG9lFCjiz4BH7l9wmrMkfkJYCxFwKQic8+RTZgWPuWxwAfjJElsXkex7DJjfSJsQIt931ilUgmwdA=="],
+
+    "hast-util-to-text": ["hast-util-to-text@4.0.2", "", { "dependencies": { "@types/hast": "^3.0.0", "@types/unist": "^3.0.0", "hast-util-is-element": "^3.0.0", "unist-util-find-after": "^5.0.0" } }, "sha512-KK6y/BN8lbaq654j7JgBydev7wuNMcID54lkRav1P0CaE1e47P72AWWPiGKXTJU271ooYzcvTAn/Zt0REnvc7A=="],
+
+    "hast-util-whitespace": ["hast-util-whitespace@3.0.0", "", { "dependencies": { "@types/hast": "^3.0.0" } }, "sha512-88JUN06ipLwsnv+dVn+OIYOvAuvBMy/Qoi6O7mQHxdPXpjy+Cd6xRkWwux7DKO+4sYILtLBRIKgsdpS2gQc7qw=="],
+
+    "hastscript": ["hastscript@9.0.1", "", { "dependencies": { "@types/hast": "^3.0.0", "comma-separated-tokens": "^2.0.0", "hast-util-parse-selector": "^4.0.0", "property-information": "^7.0.0", "space-separated-tokens": "^2.0.0" } }, "sha512-g7df9rMFX/SPi34tyGCyUBREQoKkapwdY/T04Qn9TDWfHhAYt4/I0gMVirzK5wEzeUqIjEB+LXC/ypb7Aqno5w=="],
+
     "hermes-estree": ["hermes-estree@0.25.1", "", {}, "sha512-0wUoCcLp+5Ev5pDW2OriHC2MJCbwLwuRx+gAqMTOkGKJJiBCLjtrvy4PWUGn6MIVefecRpzoOZ/UV6iGdOr+Cw=="],
 
     "hermes-parser": ["hermes-parser@0.25.1", "", { "dependencies": { "hermes-estree": "0.25.1" } }, "sha512-6pEjquH3rqaI6cYAXYPcz9MS4rY6R4ngRgrgfDshRptUZIc3lw0MCIJIGDj9++mfySOuPTHB4nrSW99BCvOPIA=="],
 
+    "highlight.js": ["highlight.js@11.11.1", "", {}, "sha512-Xwwo44whKBVCYoliBQwaPvtd/2tYFkRQtXDWj1nackaV2JPXx3L0+Jvd8/qCJ2p+ML0/XVkJ2q+Mr+UVdpJK5w=="],
+
+    "hookable": ["hookable@6.1.1", "", {}, "sha512-U9LYDy1CwhMCnprUfeAZWZGByVbhd54hwepegYTK7Pi5NvqEj63ifz5z+xukznehT7i6NIZRu89Ay1AZmRsLEQ=="],
+
     "html-encoding-sniffer": ["html-encoding-sniffer@6.0.0", "", { "dependencies": { "@exodus/bytes": "^1.6.0" } }, "sha512-CV9TW3Y3f8/wT0BRFc1/KAVQ3TUHiXmaAb6VW9vtiMFf7SLoMd1PdAc4W3KFOFETBJUb90KatHqlsZMWV+R9Gg=="],
 
     "html-parse-stringify": ["html-parse-stringify@3.0.1", "", { "dependencies": { "void-elements": "3.1.0" } }, "sha512-KknJ50kTInJ7qIScF3jeaFRpMpE8/lfiTdzf/twXyPBLAGrLRTmkz3AdTnKeh40X8k9L2fdYwEp/42WGXIRGcg=="],
 
+    "html-void-elements": ["html-void-elements@3.0.0", "", {}, "sha512-bEqo66MRXsUGxWHV5IP0PUiAWwoEjba4VCzg0LjFJBpchPaTfyfCKTG6bc5F8ucKec3q5y6qOdGyYTSBEvhCrg=="],
+
+    "html-whitespace-sensitive-tag-names": ["html-whitespace-sensitive-tag-names@3.0.1", "", {}, "sha512-q+310vW8zmymYHALr1da4HyXUQ0zgiIwIicEfotYPWGN0OJVEN/58IJ3A4GBYcEq3LGAZqKb+ugvP0GNB9CEAA=="],
+
     "https-proxy-agent": ["https-proxy-agent@5.0.1", "", { "dependencies": { "agent-base": "6", "debug": "4" } }, "sha512-dFcAjpTQFgoLMzC2VwU+C/CbS7uRL0lWmxDITmqm7C+7F0Odmj6s9l6alZc6AELXhrnggM2CeWSXHGOdX2YtwA=="],
 
     "human-signals": ["human-signals@8.0.1", "", {}, "sha512-eKCa6bwnJhvxj14kZk5NCPc6Hb6BdsU9DZcOnmQKSnO1VKrfV0zCvtttPZUsBvjmNDn8rpcJfpwSYnHBjc95MQ=="],
@@ -840,22 +1091,32 @@
 
     "i18next-browser-languagedetector": ["i18next-browser-languagedetector@8.2.1", "", { "dependencies": { "@babel/runtime": "^7.23.2" } }, "sha512-bZg8+4bdmaOiApD7N7BPT9W8MLZG+nPTOFlLiJiT8uzKXFjhxw4v2ierCXOwB5sFDMtuA5G4kgYZ0AznZxQ/cw=="],
 
+    "identifier-regex": ["identifier-regex@1.0.1", "", { "dependencies": { "reserved-identifiers": "^1.0.0" } }, "sha512-ZrYyM0sozNPZlvBvE7Oq9Bn44n0qKGrYu5sQ0JzMUnjIhpgWYE2JB6aBoFwEYdPjqj7jPyxXTMJiHDOxDfd8yw=="],
+
     "ignore": ["ignore@5.3.2", "", {}, "sha512-hsBTNUqQTDwkWtcdYI2i06Y/nUBEsNEDJKjWdigLvegy8kDuJAS8uRlpkkcQpyEXL0Z/pjDy5HBmMjRCJ2gq+g=="],
 
     "imurmurhash": ["imurmurhash@0.1.4", "", {}, "sha512-JmXMZ6wuvDmLiHEml9ykzqO6lwFbof0GG4IkcGaENdCRDDmMVnny7s5HsIgHCbaq0w2MyPhDqkhTUgS2LU2PHA=="],
 
     "indent-string": ["indent-string@4.0.0", "", {}, "sha512-EdDDZu4A2OyIK7Lr/2zG+w5jmbuk1DVBnEwREQvBzspBJkCEbRa8GxU1lghYcaGJCnRWibjDXlq779X1/y5xwg=="],
 
+    "is-absolute-url": ["is-absolute-url@4.0.1", "", {}, "sha512-/51/TKE88Lmm7Gc4/8btclNXWS+g50wXhYJq8HWIBAGUBnoAdRu1aXeh364t/O7wXDAcTJDP8PNuNKWUDWie+A=="],
+
     "is-extglob": ["is-extglob@2.1.1", "", {}, "sha512-SbKbANkN603Vi4jEZv49LeVJMn4yGwsbzZworEoyEiutsN3nJYdbO36zfhGJ6QEDpOZIFkDtnq5JRxmvl3jsoQ=="],
 
     "is-fullwidth-code-point": ["is-fullwidth-code-point@3.0.0", "", {}, "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg=="],
 
     "is-glob": ["is-glob@4.0.3", "", { "dependencies": { "is-extglob": "^2.1.1" } }, "sha512-xelSayHH36ZgE7ZWhli7pW34hNbNl8Ojv5KVmkJD4hBdD3th8Tfk9vYasLM+mXWOZhFkgZfxhLSnrwRr4elSSg=="],
 
+    "is-identifier": ["is-identifier@1.0.1", "", { "dependencies": { "identifier-regex": "^1.0.0", "super-regex": "^1.0.0" } }, "sha512-HQ5v4rEJ7REUV54bCd2l5FaD299SGDEn2UPoVXaTHAyGviLq2menVUD2udi3trQ32uvB6LdAh/0ck2EuizrtpA=="],
+
+    "is-obj": ["is-obj@3.0.0", "", {}, "sha512-IlsXEHOjtKhpN8r/tRFj2nDyTmHvcfNeu/nrRIcXE17ROeatXchkojffa1SpdqW4cr/Fj6QkEf/Gn4zf6KKvEQ=="],
+
     "is-plain-obj": ["is-plain-obj@4.1.0", "", {}, "sha512-+Pgi+vMuUNkJyExiMBt5IlFoMyKnr5zhJ4Uspz58WOhBF5QoIZkFyNHIbBAtHwzVAgk5RtndVNsDRN61/mmDqg=="],
 
     "is-potential-custom-element-name": ["is-potential-custom-element-name@1.0.1", "", {}, "sha512-bCYeRA2rVibKZd+s2625gGnGF/t7DSqDs4dP7CrLA1m7jKWz6pps0LpYLJN8Q64HtmPKJ1hrN3nzPNKFEKOUiQ=="],
 
+    "is-regexp": ["is-regexp@3.1.0", "", {}, "sha512-rbku49cWloU5bSMI+zaRaXdQHXnthP6DZ/vLnfdSKyL4zUzuWnomtOEiZZOd+ioQ+avFo/qau3KPTc7Fjy1uPA=="],
+
     "is-stream": ["is-stream@4.0.1", "", {}, "sha512-Dnz92NInDqYckGEUJv689RbRiTSEHCQ7wOVeALbkOz999YpqT46yMRIGtSNl2iCL1waAZSx40+h59NV/EwzV/A=="],
 
     "is-unicode-supported": ["is-unicode-supported@2.1.0", "", {}, "sha512-mE00Gnza5EEB3Ds0HfMyllZzbBrmLOX3vfWoj9A9PEnTfratQ/BcaJOuMhnkhjXvb2+FkY3VuHqtAGpTPmglFQ=="],
@@ -866,6 +1127,8 @@
 
     "joi": ["joi@18.2.1", "", { "dependencies": { "@hapi/address": "^5.1.1", "@hapi/formula": "^3.0.2", "@hapi/hoek": "^11.0.7", "@hapi/pinpoint": "^2.0.1", "@hapi/tlds": "^1.1.1", "@hapi/topo": "^6.0.2", "@standard-schema/spec": "^1.1.0" } }, "sha512-2/OKlogiESf2Nh3TFCrRjrr9z1DRHeW0I+KReF67+4J0Ns+8hBtHRmoWAZ2OFU6I5+TWLEe6sVlSdXPjHm5UbQ=="],
 
+    "js-base64": ["js-base64@3.8.0", "", {}, "sha512-65kvbemyZhj+ExQt1PEFyBEjL5vAHysu1lJdW1AwhhChkO8ZBPizYk/m9GVrpbS2Je1hF+UYZ+6KywqtZV8mHw=="],
+
     "js-tokens": ["js-tokens@4.0.0", "", {}, "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ=="],
 
     "jsdom": ["jsdom@29.1.1", "", { "dependencies": { "@asamuzakjp/css-color": "^5.1.11", "@asamuzakjp/dom-selector": "^7.1.1", "@bramus/specificity": "^2.4.2", "@csstools/css-syntax-patches-for-csstree": "^1.1.3", "@exodus/bytes": "^1.15.0", "css-tree": "^3.2.1", "data-urls": "^7.0.0", "decimal.js": "^10.6.0", "html-encoding-sniffer": "^6.0.0", "is-potential-custom-element-name": "^1.0.1", "lru-cache": "^11.3.5", "parse5": "^8.0.1", "saxes": "^6.0.0", "symbol-tree": "^3.2.4", "tough-cookie": "^6.0.1", "undici": "^7.25.0", "w3c-xmlserializer": "^5.0.0", "webidl-conversions": "^8.0.1", "whatwg-mimetype": "^5.0.0", "whatwg-url": "^16.0.1", "xml-name-validator": "^5.0.0" }, "peerDependencies": { "canvas": "^3.0.0" }, "optionalPeers": ["canvas"] }, "sha512-ECi4Fi2f7BdJtUKTflYRTiaMxIB0O6zfR1fX0GXpUrf6flp8QIYn1UT20YQqdSOfk2dfkCwS8LAFoJDEppNK5Q=="],
@@ -874,12 +1137,16 @@
 
     "json-buffer": ["json-buffer@3.0.1", "", {}, "sha512-4bV5BfR2mqfQTJm+V5tPPdf+ZpuhiIvTuAB5g8kcrXOZpTT/QwwVRWBywX1ozr6lEuPdbHxwaJlm9G6mI2sfSQ=="],
 
+    "json-schema": ["json-schema@0.4.0", "", {}, "sha512-es94M3nTIfsEPisRafak+HDLfHXnKBhV3vU5eqPcS3flIWqcxJWgXHXiey3YrpaNsanY5ei1VoYEbOzijuq9BA=="],
+
     "json-schema-traverse": ["json-schema-traverse@0.4.1", "", {}, "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg=="],
 
     "json-stable-stringify-without-jsonify": ["json-stable-stringify-without-jsonify@1.0.1", "", {}, "sha512-Bdboy+l7tA3OGW6FjyFHWkP5LuByj1Tk33Ljyq0axyzdk9//JSi2u3fP1QSmd1KNwq6VOKYGlAu87CisVir6Pw=="],
 
     "json5": ["json5@2.2.3", "", { "bin": { "json5": "lib/cli.js" } }, "sha512-XmOWe7eyHYH14cLdVPoyg+GOH3rYX++KpzrylJwSW98t3Nk+U8XOl8FWKOgwtzdb8lXGf6zYwDUzeHMWfxasyg=="],
 
+    "jsonc-parser": ["jsonc-parser@3.3.1", "", {}, "sha512-HUgH65KyejrUFPvHFPbqOY0rsFip3Bo5wb4ngvdi1EpCYWUQDC5V+Y7mZws+DLkr4M//zQJoanu1SP+87Dv1oQ=="],
+
     "keyv": ["keyv@4.5.4", "", { "dependencies": { "json-buffer": "3.0.1" } }, "sha512-oxVHkHR/EJf2CNXnWxRLW6mg7JyCCUcG0DtEGmL2ctUo1PNTin1PUil+r/+4r5MpVgC/fn1kjsx7mjSujKqIpw=="],
 
     "kill-port-process": ["kill-port-process@4.0.2", "", { "dependencies": { "get-them-args": "1.3.2", "pid-port": "2.0.1" }, "bin": { "kill-port": "dist/bin/kill-port-process.js" } }, "sha512-fO8gc45EYJQUQWozPBmdTpsR0GDvldsmrhP2I4FPoNejwyBY4Liiwj9Is7P/5rj6k07ZQ5Ob0g0k2dqQcslW/w=="],
@@ -916,6 +1183,10 @@
 
     "lodash": ["lodash@4.18.1", "", {}, "sha512-dMInicTPVE8d1e5otfwmmjlxkZoUpiVLwyeTdUsi/Caj/gfzzblBcCE5sRHV/AsjuCmxWrte2TNGSYuCeCq+0Q=="],
 
+    "longest-streak": ["longest-streak@3.1.0", "", {}, "sha512-9Ri+o0JYgehTaVBBDoMqIl8GXtbWg711O3srftcHhZ0dqnETqLaoIK0x17fUw9rFSlK/0NlsKe0Ahhyl5pXE2g=="],
+
+    "lowlight": ["lowlight@3.3.0", "", { "dependencies": { "@types/hast": "^3.0.0", "devlop": "^1.0.0", "highlight.js": "~11.11.0" } }, "sha512-0JNhgFoPvP6U6lE/UdVsSq99tn6DhjjpAj5MxG49ewd2mOBVtwWYIT8ClyABhq198aXXODMU6Ox8DrGy/CpTZQ=="],
+
     "lru-cache": ["lru-cache@11.3.6", "", {}, "sha512-Gf/KoL3C/MlI7Bt0PGI9I+TeTC/I6r/csU58N4BSNc4lppLBeKsOdFYkK+dX0ABDUMJNfCHTyPpzwwO21Awd3A=="],
 
     "lucide-react": ["lucide-react@1.18.0", "", { "peerDependencies": { "react": "^16.5.1 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-LZDb7H/0YfM+RJncD0hDQRCAu+vSGODqpe35TuVI8EuXaRjkczbsx7p8dY4J87F/MUSj6bpYqeI8nw8qXaAdmA=="],
@@ -924,10 +1195,96 @@
 
     "magic-string": ["magic-string@0.30.21", "", { "dependencies": { "@jridgewell/sourcemap-codec": "^1.5.5" } }, "sha512-vd2F4YUyEXKGcLHoq+TEyCjxueSeHnFxyyjNp80yg0XV4vUhnDer/lvvlqM/arB5bXQN5K2/3oinyCRyx8T2CQ=="],
 
+    "make-asynchronous": ["make-asynchronous@1.1.0", "", { "dependencies": { "p-event": "^6.0.0", "type-fest": "^4.6.0", "web-worker": "^1.5.0" } }, "sha512-ayF7iT+44LXdxJLTrTd3TLQpFDDvPCBxXxbv+pMUSuHA5Q8zyAfwkRP6aHHwNVFBUFWtxAHqwNJxF8vMZLAbVg=="],
+
+    "markdown-table": ["markdown-table@3.0.4", "", {}, "sha512-wiYz4+JrLyb/DqW2hkFJxP7Vd7JuTDm77fvbM8VfEQdmSMqcImWeeRbHwZjBjIFki/VaMK2BhFi7oUUZeM5bqw=="],
+
     "math-intrinsics": ["math-intrinsics@1.1.0", "", {}, "sha512-/IXtbwEk5HTPyEwyKX6hGkYXxM9nbj64B+ilVJnC/R6B0pH5G4V3b0pVbL7DBj4tkhBAppbQUlf6F6Xl9LHu1g=="],
 
+    "mdast-util-find-and-replace": ["mdast-util-find-and-replace@3.0.2", "", { "dependencies": { "@types/mdast": "^4.0.0", "escape-string-regexp": "^5.0.0", "unist-util-is": "^6.0.0", "unist-util-visit-parents": "^6.0.0" } }, "sha512-Tmd1Vg/m3Xz43afeNxDIhWRtFZgM2VLyaf4vSTYwudTyeuTneoL3qtWMA5jeLyz/O1vDJmmV4QuScFCA2tBPwg=="],
+
+    "mdast-util-from-markdown": ["mdast-util-from-markdown@2.0.3", "", { "dependencies": { "@types/mdast": "^4.0.0", "@types/unist": "^3.0.0", "decode-named-character-reference": "^1.0.0", "devlop": "^1.0.0", "mdast-util-to-string": "^4.0.0", "micromark": "^4.0.0", "micromark-util-decode-numeric-character-reference": "^2.0.0", "micromark-util-decode-string": "^2.0.0", "micromark-util-normalize-identifier": "^2.0.0", "micromark-util-symbol": "^2.0.0", "micromark-util-types": "^2.0.0", "unist-util-stringify-position": "^4.0.0" } }, "sha512-W4mAWTvSlKvf8L6J+VN9yLSqQ9AOAAvHuoDAmPkz4dHf553m5gVj2ejadHJhoJmcmxEnOv6Pa8XJhpxE93kb8Q=="],
+
+    "mdast-util-gfm": ["mdast-util-gfm@3.1.0", "", { "dependencies": { "mdast-util-from-markdown": "^2.0.0", "mdast-util-gfm-autolink-literal": "^2.0.0", "mdast-util-gfm-footnote": "^2.0.0", "mdast-util-gfm-strikethrough": "^2.0.0", "mdast-util-gfm-table": "^2.0.0", "mdast-util-gfm-task-list-item": "^2.0.0", "mdast-util-to-markdown": "^2.0.0" } }, "sha512-0ulfdQOM3ysHhCJ1p06l0b0VKlhU0wuQs3thxZQagjcjPrlFRqY215uZGHHJan9GEAXd9MbfPjFJz+qMkVR6zQ=="],
+
+    "mdast-util-gfm-autolink-literal": ["mdast-util-gfm-autolink-literal@2.0.1", "", { "dependencies": { "@types/mdast": "^4.0.0", "ccount": "^2.0.0", "devlop": "^1.0.0", "mdast-util-find-and-replace": "^3.0.0", "micromark-util-character": "^2.0.0" } }, "sha512-5HVP2MKaP6L+G6YaxPNjuL0BPrq9orG3TsrZ9YXbA3vDw/ACI4MEsnoDpn6ZNm7GnZgtAcONJyPhOP8tNJQavQ=="],
+
+    "mdast-util-gfm-footnote": ["mdast-util-gfm-footnote@2.1.0", "", { "dependencies": { "@types/mdast": "^4.0.0", "devlop": "^1.1.0", "mdast-util-from-markdown": "^2.0.0", "mdast-util-to-markdown": "^2.0.0", "micromark-util-normalize-identifier": "^2.0.0" } }, "sha512-sqpDWlsHn7Ac9GNZQMeUzPQSMzR6Wv0WKRNvQRg0KqHh02fpTz69Qc1QSseNX29bhz1ROIyNyxExfawVKTm1GQ=="],
+
+    "mdast-util-gfm-strikethrough": ["mdast-util-gfm-strikethrough@2.0.0", "", { "dependencies": { "@types/mdast": "^4.0.0", "mdast-util-from-markdown": "^2.0.0", "mdast-util-to-markdown": "^2.0.0" } }, "sha512-mKKb915TF+OC5ptj5bJ7WFRPdYtuHv0yTRxK2tJvi+BDqbkiG7h7u/9SI89nRAYcmap2xHQL9D+QG/6wSrTtXg=="],
+
+    "mdast-util-gfm-table": ["mdast-util-gfm-table@2.0.0", "", { "dependencies": { "@types/mdast": "^4.0.0", "devlop": "^1.0.0", "markdown-table": "^3.0.0", "mdast-util-from-markdown": "^2.0.0", "mdast-util-to-markdown": "^2.0.0" } }, "sha512-78UEvebzz/rJIxLvE7ZtDd/vIQ0RHv+3Mh5DR96p7cS7HsBhYIICDBCu8csTNWNO6tBWfqXPWekRuj2FNOGOZg=="],
+
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+
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+    "micromark-util-subtokenize": ["micromark-util-subtokenize@2.1.0", "", { "dependencies": { "devlop": "^1.0.0", "micromark-util-chunked": "^2.0.0", "micromark-util-symbol": "^2.0.0", "micromark-util-types": "^2.0.0" } }, "sha512-XQLu552iSctvnEcgXw6+Sx75GflAPNED1qx7eBJ+wydBb2KCbRZe+NwvIEEMM83uml1+2WSXpBAcp9IUCgCYWA=="],
+
+    "micromark-util-symbol": ["micromark-util-symbol@2.0.1", "", {}, "sha512-vs5t8Apaud9N28kgCrRUdEed4UJ+wWNvicHLPxCa9ENlYuAY31M0ETy5y1vA33YoNPDFTghEbnh6efaE8h4x0Q=="],
+
+    "micromark-util-types": ["micromark-util-types@2.0.2", "", {}, "sha512-Yw0ECSpJoViF1qTU4DC6NwtC4aWGt1EkzaQB8KPPyCRR8z9TWeV0HbEFGTO+ZY1wB22zmxnJqhPyTpOVCpeHTA=="],
+
     "mime-db": ["mime-db@1.52.0", "", {}, "sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg=="],
 
     "mime-types": ["mime-types@2.1.35", "", { "dependencies": { "mime-db": "1.52.0" } }, "sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw=="],
@@ -946,6 +1303,8 @@
 
     "natural-compare": ["natural-compare@1.4.0", "", {}, "sha512-OWND8ei3VtNC9h7V60qff3SVobHr996CTwgxubgyQYEpg290h9J0buyECNNJexkFm5sOajh5G116RYA1c8ZMSw=="],
 
+    "neverpanic": ["neverpanic@0.0.8", "", {}, "sha512-vVdkelrLxaow/fdWDumzNBO+jwm6X8bxeLJc34THtpj70u0C5QBkcV6CRCu2X726km7XD45N0A3QtYCla4RvKw=="],
+
     "node-fetch-native": ["node-fetch-native@1.6.7", "", {}, "sha512-g9yhqoedzIUm0nTnTqAQvueMPVOuIY16bqgAJJC8XOOubYFNwz6IER9qs0Gq2Xd0+CecCKFjtdDTMA4u4xG06Q=="],
 
     "node-releases": ["node-releases@2.0.37", "", {}, "sha512-1h5gKZCF+pO/o3Iqt5Jp7wc9rH3eJJ0+nh/CIoiRwjRxde/hAHyLPXYN4V3CqKAbiZPSeJFSWHmJsbkicta0Eg=="],
@@ -970,10 +1329,14 @@
 
     "oxlint": ["oxlint@1.71.0", "", { "optionalDependencies": { "@oxlint/binding-android-arm-eabi": "1.71.0", "@oxlint/binding-android-arm64": "1.71.0", "@oxlint/binding-darwin-arm64": "1.71.0", "@oxlint/binding-darwin-x64": "1.71.0", "@oxlint/binding-freebsd-x64": "1.71.0", "@oxlint/binding-linux-arm-gnueabihf": "1.71.0", "@oxlint/binding-linux-arm-musleabihf": "1.71.0", "@oxlint/binding-linux-arm64-gnu": "1.71.0", "@oxlint/binding-linux-arm64-musl": "1.71.0", "@oxlint/binding-linux-ppc64-gnu": "1.71.0", "@oxlint/binding-linux-riscv64-gnu": "1.71.0", "@oxlint/binding-linux-riscv64-musl": "1.71.0", "@oxlint/binding-linux-s390x-gnu": "1.71.0", "@oxlint/binding-linux-x64-gnu": "1.71.0", "@oxlint/binding-linux-x64-musl": "1.71.0", "@oxlint/binding-openharmony-arm64": "1.71.0", "@oxlint/binding-win32-arm64-msvc": "1.71.0", "@oxlint/binding-win32-ia32-msvc": "1.71.0", "@oxlint/binding-win32-x64-msvc": "1.71.0" }, "peerDependencies": { "oxlint-tsgolint": ">=0.22.1", "vite-plus": "*" }, "optionalPeers": ["oxlint-tsgolint", "vite-plus"], "bin": { "oxlint": "bin/oxlint" } }, "sha512-U1m1X+C0vDj7DC1e13IoZULzEcPczE7UOMTs8VlZGHUEIUaSTZKo5qkPsQEfzpgnQ29Pea/w3Xntk62UCecxZw=="],
 
+    "p-event": ["p-event@6.0.1", "", { "dependencies": { "p-timeout": "^6.1.2" } }, "sha512-Q6Bekk5wpzW5qIyUP4gdMEujObYstZl6DMMOSenwBvV0BlE5LkDwkjs5yHbZmdCEq2o4RJx4tE1vwxFVf2FG1w=="],
+
     "p-limit": ["p-limit@3.1.0", "", { "dependencies": { "yocto-queue": "^0.1.0" } }, "sha512-TYOanM3wGwNGsZN2cVTYPArw454xnXj5qmWF1bEoAc4+cU/ol7GVh7odevjp1FNHduHc3KZMcFduxU5Xc6uJRQ=="],
 
     "p-locate": ["p-locate@5.0.0", "", { "dependencies": { "p-limit": "^3.0.2" } }, "sha512-LaNjtRWUBY++zB5nE/NwcaoMylSPk+S+ZHNB1TzdbMJMny6dynpAGt7X/tl/QYq3TIeE6nxHppbo2LGymrG5Pw=="],
 
+    "p-timeout": ["p-timeout@6.1.4", "", {}, "sha512-MyIV3ZA/PmyBN/ud8vV9XzwTrNtR4jFrObymZYnZqMmW0zA8Z17vnT0rBgFE/TlohB+YCHqXMgZzb3Csp49vqg=="],
+
     "p-try": ["p-try@2.2.0", "", {}, "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ=="],
 
     "package-manager-detector": ["package-manager-detector@1.6.0", "", {}, "sha512-61A5ThoTiDG/C8s8UMZwSorAGwMJ0ERVGj2OjoW5pAalsNOg15+iQiPzrLJ4jhZ1HJzmC2PIHT2oEiH3R5fzNA=="],
@@ -1010,6 +1373,8 @@
 
     "pretty-ms": ["pretty-ms@9.3.0", "", { "dependencies": { "parse-ms": "^4.0.0" } }, "sha512-gjVS5hOP+M3wMm5nmNOucbIrqudzs9v/57bWRHQWLYklXqoXKrVfYW2W9+glfGsqtPgpiz5WwyEEB+ksXIx3gQ=="],
 
+    "property-information": ["property-information@7.2.0", "", {}, "sha512-IAtzIB6sUiWaJYrX9smp3V46pBGbBeLFRGdh25kg1334VcBlD8HzhPeNIWQH9zhGmo2itIe25EHt9dQP7G5hmg=="],
+
     "proxy-from-env": ["proxy-from-env@2.1.0", "", {}, "sha512-cJ+oHTW1VAEa8cJslgmUZrc+sjRKgAKl3Zyse6+PV38hZe/V6Z14TbCuXcan9F9ghlz4QrFr2c92TNF82UkYHA=="],
 
     "punycode": ["punycode@2.3.1", "", {}, "sha512-vYt7UD1U9Wg6138shLtLOvdAu+8DsC/ilFtEVHcH+wydcSpNE20AfSOduf6MkRFahL5FY7X1oU7nKVZFtfq8Fg=="],
@@ -1018,6 +1383,8 @@
 
     "quansync": ["quansync@1.0.0", "", {}, "sha512-5xZacEEufv3HSTPQuchrvV6soaiACMFnq1H8wkVioctoH3TRha9Sz66lOxRwPK/qZj7HPiSveih9yAyh98gvqA=="],
 
+    "radix-vue": ["radix-vue@1.9.17", "", { "dependencies": { "@floating-ui/dom": "^1.6.7", "@floating-ui/vue": "^1.1.0", "@internationalized/date": "^3.5.4", "@internationalized/number": "^3.5.3", "@tanstack/vue-virtual": "^3.8.1", "@vueuse/core": "^10.11.0", "@vueuse/shared": "^10.11.0", "aria-hidden": "^1.2.4", "defu": "^6.1.4", "fast-deep-equal": "^3.1.3", "nanoid": "^5.0.7" }, "peerDependencies": { "vue": ">= 3.2.0" } }, "sha512-mVCu7I2vXt1L2IUYHTt0sZMz7s1K2ZtqKeTIxG3yC5mMFfLBG4FtE1FDeRMpDd+Hhg/ybi9+iXmAP1ISREndoQ=="],
+
     "react": ["react@19.2.7", "", {}, "sha512-HNe9WslTbXmFK8o8cmwgAeJFSBvt1bPdHCVKtaaV+WlAN36mpT4hcRpwbf3fY56ar2oIXzsBpOAiIRHAdY0OlQ=="],
 
     "react-dom": ["react-dom@19.2.7", "", { "dependencies": { "scheduler": "^0.27.0" }, "peerDependencies": { "react": "^19.2.7" } }, "sha512-t0BRVXvbiE/o20Hfw669rLbMCDWtYZLvmJigy2f0MxsXF+71pxhR3xOkspmsO8h3ZlNzyibAmtCa3l4lYKk6gQ=="],
@@ -1038,12 +1405,34 @@
 
     "redent": ["redent@3.0.0", "", { "dependencies": { "indent-string": "^4.0.0", "strip-indent": "^3.0.0" } }, "sha512-6tDA8g98We0zd0GvVeMT9arEOnTw9qM03L9cJXaCjrip1OO764RDBLBfrB4cwzNGDj5OA5ioymC9GkizgWJDUg=="],
 
+    "rehype-external-links": ["rehype-external-links@3.0.0", "", { "dependencies": { "@types/hast": "^3.0.0", "@ungap/structured-clone": "^1.0.0", "hast-util-is-element": "^3.0.0", "is-absolute-url": "^4.0.0", "space-separated-tokens": "^2.0.0", "unist-util-visit": "^5.0.0" } }, "sha512-yp+e5N9V3C6bwBeAC4n796kc86M4gJCdlVhiMTxIrJG5UHDMh+PJANf9heqORJbt1nrCbDwIlAZKjANIaVBbvw=="],
+
+    "rehype-format": ["rehype-format@5.0.1", "", { "dependencies": { "@types/hast": "^3.0.0", "hast-util-format": "^1.0.0" } }, "sha512-zvmVru9uB0josBVpr946OR8ui7nJEdzZobwLOOqHb/OOD88W0Vk2SqLwoVOj0fM6IPCCO6TaV9CvQvJMWwukFQ=="],
+
+    "rehype-parse": ["rehype-parse@9.0.1", "", { "dependencies": { "@types/hast": "^3.0.0", "hast-util-from-html": "^2.0.0", "unified": "^11.0.0" } }, "sha512-ksCzCD0Fgfh7trPDxr2rSylbwq9iYDkSn8TCDmEJ49ljEUBxDVCzCHv7QNzZOfODanX4+bWQ4WZqLCRWYLfhag=="],
+
+    "rehype-raw": ["rehype-raw@7.0.0", "", { "dependencies": { "@types/hast": "^3.0.0", "hast-util-raw": "^9.0.0", "vfile": "^6.0.0" } }, "sha512-/aE8hCfKlQeA8LmyeyQvQF3eBiLRGNlfBJEvWH7ivp9sBqs7TNqBL5X3v157rM4IFETqDnIOO+z5M/biZbo9Ww=="],
+
+    "rehype-sanitize": ["rehype-sanitize@6.0.0", "", { "dependencies": { "@types/hast": "^3.0.0", "hast-util-sanitize": "^5.0.0" } }, "sha512-CsnhKNsyI8Tub6L4sm5ZFsme4puGfc6pYylvXo1AeqaGbjOYyzNv3qZPwvs0oMJ39eryyeOdmxwUIo94IpEhqg=="],
+
+    "rehype-stringify": ["rehype-stringify@10.0.1", "", { "dependencies": { "@types/hast": "^3.0.0", "hast-util-to-html": "^9.0.0", "unified": "^11.0.0" } }, "sha512-k9ecfXHmIPuFVI61B9DeLPN0qFHfawM6RsuX48hoqlaKSF61RskNjSm1lI8PhBEM0MRdLxVVm4WmTqJQccH9mA=="],
+
+    "remark-gfm": ["remark-gfm@4.0.1", "", { "dependencies": { "@types/mdast": "^4.0.0", "mdast-util-gfm": "^3.0.0", "micromark-extension-gfm": "^3.0.0", "remark-parse": "^11.0.0", "remark-stringify": "^11.0.0", "unified": "^11.0.0" } }, "sha512-1quofZ2RQ9EWdeN34S79+KExV1764+wCUGop5CPL1WGdD0ocPpu91lzPGbwWMECpEpd42kJGQwzRfyov9j4yNg=="],
+
+    "remark-parse": ["remark-parse@11.0.0", "", { "dependencies": { "@types/mdast": "^4.0.0", "mdast-util-from-markdown": "^2.0.0", "micromark-util-types": "^2.0.0", "unified": "^11.0.0" } }, "sha512-FCxlKLNGknS5ba/1lmpYijMUzX2esxW5xQqjWxw2eHFfS2MSdaHVINFmhjo+qN1WhZhNimq0dZATN9pH0IDrpA=="],
+
+    "remark-rehype": ["remark-rehype@11.1.2", "", { "dependencies": { "@types/hast": "^3.0.0", "@types/mdast": "^4.0.0", "mdast-util-to-hast": "^13.0.0", "unified": "^11.0.0", "vfile": "^6.0.0" } }, "sha512-Dh7l57ianaEoIpzbp0PC9UKAdCSVklD8E5Rpw7ETfbTl3FqcOOgq5q2LVDhgGCkaBv7p24JXikPdvhhmHvKMsw=="],
+
+    "remark-stringify": ["remark-stringify@11.0.0", "", { "dependencies": { "@types/mdast": "^4.0.0", "mdast-util-to-markdown": "^2.0.0", "unified": "^11.0.0" } }, "sha512-1OSmLd3awB/t8qdoEOMazZkNsfVTeY4fTsgzcQFdXNq8ToTN4ZGwrMnlda4K6smTFKD+GRV6O48i6Z4iKgPPpw=="],
+
     "require-directory": ["require-directory@2.1.1", "", {}, "sha512-fGxEI7+wsG9xrvdjsrlmL22OMTTiHRwAMroiEeMgq8gzoLC/PQr7RsRDSTLUg/bZAZtF+TVIkHc6/4RIKrui+Q=="],
 
     "require-from-string": ["require-from-string@2.0.2", "", {}, "sha512-Xf0nWe6RseziFMu+Ap9biiUbmplq6S9/p+7w7YXP/JBHhrUDDUhwa+vANyubuqfZWTveU//DYVGsDG7RKL/vEw=="],
 
     "require-main-filename": ["require-main-filename@2.0.0", "", {}, "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg=="],
 
+    "reserved-identifiers": ["reserved-identifiers@1.2.0", "", {}, "sha512-yE7KUfFvaBFzGPs5H3Ops1RevfUEsDc5Iz65rOwWg4lE8HJSYtle77uul3+573457oHvBKuHYDl/xqUkKpEEdw=="],
+
     "resolve-pkg-maps": ["resolve-pkg-maps@1.0.0", "", {}, "sha512-seS2Tj26TBVOC2NIc2rOe2y2ZO7efxITtLZcGSOnHHNOQ7CkiUBfw0Iw2ck6xkIhPwLhKNLS8BO+hEpngQlqzw=="],
 
     "restore-cursor": ["restore-cursor@5.1.0", "", { "dependencies": { "onetime": "^7.0.0", "signal-exit": "^4.1.0" } }, "sha512-oMA2dcrw6u0YfxJQXm342bFKX/E4sG9rbTzO9ptUcR/e8A33cHuvStiYOwH7fszkZlZ1z/ta9AAoPk2F4qIOHA=="],
@@ -1060,6 +1449,8 @@
 
     "set-blocking": ["set-blocking@2.0.0", "", {}, "sha512-KiKBS8AnWGEyLzofFfmvKwpdPzqiy16LvQfK3yv/fVH7Bj13/wl3JSR1J+rfgRE9q7xUJK4qvgS8raSOeLUehw=="],
 
+    "set-cookie-parser": ["set-cookie-parser@3.1.0", "", {}, "sha512-kjnC1DXBHcxaOaOXBHBeRtltsDG2nUiUni+jP92M9gYdW12rsmx92UsfpH7o5tDRs7I1ZZPSQJQGv3UaRfCiuw=="],
+
     "shebang-command": ["shebang-command@2.0.0", "", { "dependencies": { "shebang-regex": "^3.0.0" } }, "sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA=="],
 
     "shebang-regex": ["shebang-regex@3.0.0", "", {}, "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A=="],
@@ -1074,12 +1465,22 @@
 
     "source-map-js": ["source-map-js@1.2.1", "", {}, "sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA=="],
 
+    "space-separated-tokens": ["space-separated-tokens@2.0.2", "", {}, "sha512-PEGlAwrG8yXGXRjW32fGbg66JAlOAwbObuqVoJpv/mRgoWDQfgH1wDPvtzWyUSNAXBGSk8h755YDbbcEy3SH2Q=="],
+
     "stackback": ["stackback@0.0.2", "", {}, "sha512-1XMJE5fQo1jGH6Y/7ebnwPOBEkIEnT4QF32d5R1+VXdXveM0IBMJt8zfaxX1P3QhVwrYe+576+jkANtSS2mBbw=="],
 
     "std-env": ["std-env@4.1.0", "", {}, "sha512-Rq7ybcX2RuC55r9oaPVEW7/xu3tj8u4GeBYHBWCychFtzMIr86A7e3PPEBPT37sHStKX3+TiX/Fr/ACmJLVlLQ=="],
 
+    "string-byte-length": ["string-byte-length@3.0.1", "", {}, "sha512-yJ8vP0HMwZ54CcA8S8mKoXbkezpZHANFtmafFo8lGxZThCQcAwRHjdFabuSLgOzxj9OFJcmssmiAvmcOK4O2Hw=="],
+
+    "string-byte-slice": ["string-byte-slice@3.0.1", "", {}, "sha512-GWv2K4lYyd2+AhmKH3BV+OVx62xDX+99rSLfKpaqFiQU7uOMaUY1tDjdrRD4gsrCr9lTyjMgjna7tZcCOw+Smg=="],
+
     "string-width": ["string-width@4.2.3", "", { "dependencies": { "emoji-regex": "^8.0.0", "is-fullwidth-code-point": "^3.0.0", "strip-ansi": "^6.0.1" } }, "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g=="],
 
+    "stringify-entities": ["stringify-entities@4.0.4", "", { "dependencies": { "character-entities-html4": "^2.0.0", "character-entities-legacy": "^3.0.0" } }, "sha512-IwfBptatlO+QCJUo19AqvrPNqlVMpW9YEL2LIVY+Rpv2qsjCGxaDLNRgeGsQWJhfItebuJhsGSLjaBbNSQ+ieg=="],
+
+    "stringify-object": ["stringify-object@6.0.0", "", { "dependencies": { "get-own-enumerable-keys": "^1.0.0", "is-identifier": "^1.0.1", "is-obj": "^3.0.0", "is-regexp": "^3.1.0" } }, "sha512-6f94vIED6vmJJfh3lyVsVWxCYSfI5uM+16ntED/Ql37XIyV6kj0mRAAiTeMMc/QLYIaizC3bUprQ8pQnDDrKfA=="],
+
     "strip-ansi": ["strip-ansi@6.0.1", "", { "dependencies": { "ansi-regex": "^5.0.1" } }, "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A=="],
 
     "strip-final-newline": ["strip-final-newline@4.0.0", "", {}, "sha512-aulFJcD6YK8V1G7iRB5tigAP4TsHBZZrOV8pjV++zdUwmeV8uzbY7yn6h9MswN62adStNZFuCIx4haBnRuMDaw=="],
@@ -1088,10 +1489,20 @@
 
     "strip-json-comments": ["strip-json-comments@5.0.3", "", {}, "sha512-1tB5mhVo7U+ETBKNf92xT4hrQa3pm0MZ0PQvuDnWgAAGHDsfp4lPSpiS6psrSiet87wyGPh9ft6wmhOMQ0hDiw=="],
 
+    "style-mod": ["style-mod@4.1.3", "", {}, "sha512-i/n8VsZydrugj3Iuzll8+x/00GH2vnYsk1eomD8QiRrSAeW6ItbCQDtfXCeJHd0iwiNagqjQkvpvREEPtW3IoQ=="],
+
+    "super-regex": ["super-regex@1.1.0", "", { "dependencies": { "function-timeout": "^1.0.1", "make-asynchronous": "^1.0.1", "time-span": "^5.1.0" } }, "sha512-WHkws2ZflZe41zj6AolvvmaTrWds/VuyeYr9iPVv/oQeaIoVxMKaushfFWpOGDT+GuBrM/sVqF8KUCYQlSSTdQ=="],
+
     "supports-color": ["supports-color@8.1.1", "", { "dependencies": { "has-flag": "^4.0.0" } }, "sha512-MpUEN2OodtUzxvKQl72cUF7RQ5EiHsGvSsVG0ia9c5RbWGL2CI4C7EpPS8UTBIplnlzZiNuV56w+FuNxy3ty2Q=="],
 
+    "swrv": ["swrv@1.2.0", "", { "peerDependencies": { "vue": ">=3.2.26 < 4" } }, "sha512-lH/g4UcNyj+7lzK4eRGT4C68Q4EhQ6JtM9otPRIASfhhzfLWtbZPHcMuhuba7S9YVYuxkMUGImwMyGpfbkH07A=="],
+
     "symbol-tree": ["symbol-tree@3.2.4", "", {}, "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw=="],
 
+    "tabbable": ["tabbable@6.5.0", "", {}, "sha512-wieBHXygIm7OyQOu5hQlkk62/WyCFYGlWg7L6/ZCUZwx0o398Zkn4pVmMyfYhfMG8kGrj/Krt8eIk6UKC6VzwA=="],
+
+    "tagged-tag": ["tagged-tag@1.0.0", "", {}, "sha512-yEFYrVhod+hdNyx7g5Bnkkb0G6si8HJurOoOEgC8B/O0uXLHlaey/65KRv6cuWBNhBgHKAROVpc7QyYqE5gFng=="],
+
     "tailwind-merge": ["tailwind-merge@3.6.0", "", {}, "sha512-uxL7qAVQriqRQPAyK3pj66VqskWqoZ37PW94jwOTwNfq/z9oyu1V+eqrZqtR2+fCiXdYOZe/Modt8GtvqNzu+w=="],
 
     "tailwindcss": ["tailwindcss@4.3.1", "", {}, "sha512-hk+TB1m+K8CYNrP6rjQaq/Y+4Zylwpa87mLYBKCunwnnQ9p+fHb7kmSfGqyEJoxF/O6CDyABWVFEafNSYKll+Q=="],
@@ -1100,6 +1511,8 @@
 
     "taze": ["taze@19.14.1", "", { "dependencies": { "@antfu/ni": "^30.1.0", "@henrygd/queue": "^1.2.0", "cac": "^7.0.0", "ofetch": "^1.5.1", "package-manager-detector": "^1.6.0", "pathe": "^2.0.3", "pnpm-workspace-yaml": "^1.6.1", "restore-cursor": "^5.1.0", "tinyexec": "^1.2.2", "tinyglobby": "^0.2.16", "unconfig": "^7.5.0", "yaml": "^2.9.0" }, "bin": { "taze": "bin/taze.mjs" } }, "sha512-+wf/IqGReU68vBE/iJ7JCuV5QeD6zQBp9MI6YphN7bT2vf/YIHd0oVA4AJiX3uANI1hQY58MrVmDwLv0x/q3BA=="],
 
+    "time-span": ["time-span@5.1.0", "", { "dependencies": { "convert-hrtime": "^5.0.0" } }, "sha512-75voc/9G4rDIJleOo4jPvN4/YC4GRZrY8yy1uU4lwrB3XEQbWve8zXoO5No4eFrGcTAMYyoY67p8jRQdtA1HbA=="],
+
     "tinybench": ["tinybench@2.9.0", "", {}, "sha512-0+DUvqWMValLmha6lr4kD8iAMK1HzV0/aKnCtWb9v9641TnP/MFb7Pc2bxoxQjTXAErryXVgUOfv2YqNllqGeg=="],
 
     "tinyexec": ["tinyexec@1.2.4", "", {}, "sha512-SHf/r48b7vOrjve9PxJo3MN5v5yuyjHvdUcrQffT3WXMUfnGmHDVbC4k3sHJaJTgZCwpUplIaAo5ANtMyp3YHg=="],
@@ -1120,6 +1533,12 @@
 
     "tree-kill": ["tree-kill@1.2.2", "", { "bin": { "tree-kill": "cli.js" } }, "sha512-L0Orpi8qGpRG//Nd+H90vFB+3iHnue1zSSGmNOOCh1GLJ7rUKVwV2HvijphGQS2UmhUZewS9VgvxYIdgr+fG1A=="],
 
+    "trim-lines": ["trim-lines@3.0.1", "", {}, "sha512-kRj8B+YHZCc9kQYdWfJB2/oUl9rA99qbowYYBtr4ui4mZyAQ2JpvVBd/6U2YloATfqBhBTSMhTpgBHtU0Mf3Rg=="],
+
+    "trough": ["trough@2.2.0", "", {}, "sha512-tmMpK00BjZiUyVyvrBK7knerNgmgvcV/KLVyuma/SC+TQN167GrMRciANTz09+k3zW8L8t60jWO1GpfkZdjTaw=="],
+
+    "truncate-json": ["truncate-json@3.0.1", "", { "dependencies": { "guess-json-indent": "^3.0.1", "string-byte-length": "^3.0.1", "string-byte-slice": "^3.0.1" } }, "sha512-QVsbr1WhGLq2F0oDyYbqtOXcf3gcnL8C9H5EX8bBwAr8ZWvWGJzukpPrDrWgJMrNtgDbo74BIjI4kJu3q2xQWw=="],
+
     "tslib": ["tslib@2.8.1", "", {}, "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w=="],
 
     "turbo": ["turbo@2.9.18", "", { "optionalDependencies": { "@turbo/darwin-64": "2.9.18", "@turbo/darwin-arm64": "2.9.18", "@turbo/linux-64": "2.9.18", "@turbo/linux-arm64": "2.9.18", "@turbo/windows-64": "2.9.18", "@turbo/windows-arm64": "2.9.18" }, "bin": { "turbo": "bin/turbo" } }, "sha512-bwabv6PupzeavybzEoArBAkwq5fnzwf8OFnRtpHwnviFWuwJPFxtyH+aVp36TmIqK3aYYgtTJ3J0m2ysxxSzQg=="],
@@ -1128,6 +1547,8 @@
 
     "type-check": ["type-check@0.4.0", "", { "dependencies": { "prelude-ls": "^1.2.1" } }, "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew=="],
 
+    "type-fest": ["type-fest@5.7.0", "", { "dependencies": { "tagged-tag": "^1.0.0" } }, "sha512-1URUxUqfHFM1c+zfSPsa3gnkO7Aq21qyH75SIduNYz4SzY964rn1X2vCMQaHSHhktiw+0kPa2iyb6PUpXqB6Vg=="],
+
     "typescript": ["typescript@6.0.3", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-y2TvuxSZPDyQakkFRPZHKFm+KKVqIisdg9/CZwm9ftvKXLP8NRWj38/ODjNbr43SsoXqNuAisEf1GdCxqWcdBw=="],
 
     "ufo": ["ufo@1.6.4", "", {}, "sha512-JFNbkD1Svwe0KvGi8GOeLcP4kAWQ609twvCdcHxq1oSL8svv39ZuSvajcD8B+5D0eL4+s1Is2D/O6KN3qcTeRA=="],
@@ -1140,8 +1561,26 @@
 
     "undici": ["undici@7.25.0", "", {}, "sha512-xXnp4kTyor2Zq+J1FfPI6Eq3ew5h6Vl0F/8d9XU5zZQf1tX9s2Su1/3PiMmUANFULpmksxkClamIZcaUqryHsQ=="],
 
+    "undici-types": ["undici-types@7.18.2", "", {}, "sha512-AsuCzffGHJybSaRrmr5eHr81mwJU3kjw6M+uprWvCXiNeN9SOGwQ3Jn8jb8m3Z6izVgknn1R0FTCEAP2QrLY/w=="],
+
+    "unhead": ["unhead@2.1.15", "", { "dependencies": { "hookable": "^6.0.1" } }, "sha512-MCt5T90mCWyr3Z6pUCdM9lVRXoMoVBlL7z7U4CYVIiaDiuzad/UCfLuMqz5MeNmpZUgoBCQnrucJimU7EZR+XA=="],
+
     "unicorn-magic": ["unicorn-magic@0.3.0", "", {}, "sha512-+QBBXBCvifc56fsbuxZQ6Sic3wqqc3WWaqxs58gvJrcOuN83HGTCwz3oS5phzU9LthRNE9VrJCFCLUgHeeFnfA=="],
 
+    "unified": ["unified@11.0.5", "", { "dependencies": { "@types/unist": "^3.0.0", "bail": "^2.0.0", "devlop": "^1.0.0", "extend": "^3.0.0", "is-plain-obj": "^4.0.0", "trough": "^2.0.0", "vfile": "^6.0.0" } }, "sha512-xKvGhPWw3k84Qjh8bI3ZeJjqnyadK+GEFtazSfZv/rKeTkTjOJho6mFqh2SM96iIcZokxiOpg78GazTSg8+KHA=="],
+
+    "unist-util-find-after": ["unist-util-find-after@5.0.0", "", { "dependencies": { "@types/unist": "^3.0.0", "unist-util-is": "^6.0.0" } }, "sha512-amQa0Ep2m6hE2g72AugUItjbuM8X8cGQnFoHk0pGfrFeT9GZhzN5SW8nRsiGKK7Aif4CrACPENkA6P/Lw6fHGQ=="],
+
+    "unist-util-is": ["unist-util-is@6.0.1", "", { "dependencies": { "@types/unist": "^3.0.0" } }, "sha512-LsiILbtBETkDz8I9p1dQ0uyRUWuaQzd/cuEeS1hoRSyW5E5XGmTzlwY1OrNzzakGowI9Dr/I8HVaw4hTtnxy8g=="],
+
+    "unist-util-position": ["unist-util-position@5.0.0", "", { "dependencies": { "@types/unist": "^3.0.0" } }, "sha512-fucsC7HjXvkB5R3kTCO7kUjRdrS0BJt3M/FPxmHMBOm8JQi2BsHAHFsy27E0EolP8rp0NzXsJ+jNPyDWvOJZPA=="],
+
+    "unist-util-stringify-position": ["unist-util-stringify-position@4.0.0", "", { "dependencies": { "@types/unist": "^3.0.0" } }, "sha512-0ASV06AAoKCDkS2+xw5RXJywruurpbC4JZSm7nr7MOt1ojAzvyyaO+UxZf18j8FCF6kmzCZKcAgN/yu2gm2XgQ=="],
+
+    "unist-util-visit": ["unist-util-visit@5.1.0", "", { "dependencies": { "@types/unist": "^3.0.0", "unist-util-is": "^6.0.0", "unist-util-visit-parents": "^6.0.0" } }, "sha512-m+vIdyeCOpdr/QeQCu2EzxX/ohgS8KbnPDgFni4dQsfSCtpz8UqDyY5GjRru8PDKuYn7Fq19j1CQ+nJSsGKOzg=="],
+
+    "unist-util-visit-parents": ["unist-util-visit-parents@6.0.2", "", { "dependencies": { "@types/unist": "^3.0.0", "unist-util-is": "^6.0.0" } }, "sha512-goh1s1TBrqSqukSc8wrjwWhL0hiJxgA8m4kFxGlQ+8FYQ3C/m11FcTs4YYem7V664AhHVvgoQLk890Ssdsr2IQ=="],
+
     "update-browserslist-db": ["update-browserslist-db@1.2.3", "", { "dependencies": { "escalade": "^3.2.0", "picocolors": "^1.1.1" }, "peerDependencies": { "browserslist": ">= 4.21.0" }, "bin": { "update-browserslist-db": "cli.js" } }, "sha512-Js0m9cx+qOgDxo0eMiFGEueWztz+d4+M3rGlmKPT+T4IS/jP4ylw3Nwpu6cpTTP8R1MAC1kF4VbdLt3ARf209w=="],
 
     "uri-js": ["uri-js@4.4.1", "", { "dependencies": { "punycode": "^2.1.0" } }, "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg=="],
@@ -1152,12 +1591,28 @@
 
     "use-sync-external-store": ["use-sync-external-store@1.6.0", "", { "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-Pp6GSwGP/NrPIrxVFAIkOQeyw8lFenOHijQWkUTrDvrF4ALqylP2C/KCkeS9dpUM3KvYRQhna5vt7IL95+ZQ9w=="],
 
+    "vfile": ["vfile@6.0.3", "", { "dependencies": { "@types/unist": "^3.0.0", "vfile-message": "^4.0.0" } }, "sha512-KzIbH/9tXat2u30jf+smMwFCsno4wHVdNmzFyL+T/L3UGqqk6JKfVqOFOZEpZSHADH1k40ab6NUIXZq422ov3Q=="],
+
+    "vfile-location": ["vfile-location@5.0.3", "", { "dependencies": { "@types/unist": "^3.0.0", "vfile": "^6.0.0" } }, "sha512-5yXvWDEgqeiYiBe1lbxYF7UMAIm/IcopxMHrMQDq3nvKcjPKIhZklUKL+AE7J7uApI4kwe2snsK+eI6UTj9EHg=="],
+
+    "vfile-message": ["vfile-message@4.0.3", "", { "dependencies": { "@types/unist": "^3.0.0", "unist-util-stringify-position": "^4.0.0" } }, "sha512-QTHzsGd1EhbZs4AsQ20JX1rC3cOlt/IWJruk893DfLRr57lcnOeMaWG4K0JrRta4mIJZKth2Au3mM3u03/JWKw=="],
+
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     "vitest": ["vitest@4.1.9", "", { "dependencies": { "@vitest/expect": "4.1.9", "@vitest/mocker": "4.1.9", "@vitest/pretty-format": "4.1.9", "@vitest/runner": "4.1.9", "@vitest/snapshot": "4.1.9", "@vitest/spy": "4.1.9", "@vitest/utils": "4.1.9", "es-module-lexer": "^2.0.0", "expect-type": "^1.3.0", "magic-string": "^0.30.21", "obug": "^2.1.1", "pathe": "^2.0.3", "picomatch": "^4.0.3", "std-env": "^4.0.0-rc.1", "tinybench": "^2.9.0", "tinyexec": "^1.0.2", "tinyglobby": "^0.2.15", "tinyrainbow": "^3.1.0", "vite": "^6.0.0 || ^7.0.0 || ^8.0.0", "why-is-node-running": "^2.3.0" }, "peerDependencies": { "@edge-runtime/vm": "*", "@opentelemetry/api": "^1.9.0", "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0", "@vitest/browser-playwright": "4.1.9", "@vitest/browser-preview": "4.1.9", "@vitest/browser-webdriverio": "4.1.9", "@vitest/coverage-istanbul": "4.1.9", "@vitest/coverage-v8": "4.1.9", "@vitest/ui": "4.1.9", "happy-dom": "*", "jsdom": "*" }, "optionalPeers": ["@edge-runtime/vm", "@opentelemetry/api", "@types/node", "@vitest/browser-playwright", "@vitest/browser-preview", "@vitest/browser-webdriverio", "@vitest/coverage-istanbul", "@vitest/coverage-v8", "@vitest/ui", "happy-dom", "jsdom"], "bin": { "vitest": "./vitest.mjs" } }, "sha512-nE3/LEyc0z87uHYLZebqCUOaJr2hdtuPp7BQ4BosVFnfltxgAvMG08NyrSGlPpOUWvR27c5flSmYFTNr78L9GQ=="],
 
     "void-elements": ["void-elements@3.1.0", "", {}, "sha512-Dhxzh5HZuiHQhbvTW9AMetFfBHDMYpo23Uo9btPXgdYP+3T5S+p+jgNy7spra+veYhBP2dCSgxR/i2Y02h5/6w=="],
 
+    "vue": ["vue@3.5.39", "", { "dependencies": { "@vue/compiler-dom": "3.5.39", "@vue/compiler-sfc": "3.5.39", "@vue/runtime-dom": "3.5.39", "@vue/server-renderer": "3.5.39", "@vue/shared": "3.5.39" }, "peerDependencies": { "typescript": "*" }, "optionalPeers": ["typescript"] }, "sha512-xmZCYabFGcirU8r0fTuvl/LICc1OU620rnqepaJDL/a141ZigkG7AyaxQLdqJ02ZRYzWe6YPaDHeQx7MfknQfA=="],
+
+    "vue-component-type-helpers": ["vue-component-type-helpers@3.3.6", "", {}, "sha512-FkljacAwJ9BUoSUdpFe3VDy0sGigNlTH9+2zcXUWmZOjN8swiCkl3t48wOJun0OsUd2cEIda1l04tsxMiKIIrQ=="],
+
+    "vue-demi": ["vue-demi@0.14.10", "", { "peerDependencies": { "@vue/composition-api": "^1.0.0-rc.1", "vue": "^3.0.0-0 || ^2.6.0" }, "optionalPeers": ["@vue/composition-api"], "bin": { "vue-demi-fix": "bin/vue-demi-fix.js", "vue-demi-switch": "bin/vue-demi-switch.js" } }, "sha512-nMZBOwuzabUO0nLgIcc6rycZEebF6eeUfaiQx9+WSk8e29IbLvPU9feI6tqW4kTo3hvoYAJkMh8n8D0fuISphg=="],
+
+    "vue-sonner": ["vue-sonner@1.3.2", "", {}, "sha512-UbZ48E9VIya3ToiRHAZUbodKute/z/M1iT8/3fU8zEbwBRE11AKuHikssv18LMk2gTTr6eMQT4qf6JoLHWuj/A=="],
+
+    "w3c-keyname": ["w3c-keyname@2.2.8", "", {}, "sha512-dpojBhNsCNN7T82Tm7k26A6G9ML3NkhDsnw9n/eoxSRlVBB4CEtIQ/KTCLI2Fwf3ataSXRhYFkQi3SlnFwPvPQ=="],
+
     "w3c-xmlserializer": ["w3c-xmlserializer@5.0.0", "", { "dependencies": { "xml-name-validator": "^5.0.0" } }, "sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA=="],
 
     "wait-on": ["wait-on@9.0.10", "", { "dependencies": { "axios": "^1.16.0", "joi": "^18.2.1", "lodash": "^4.18.1", "minimist": "^1.2.8", "rxjs": "^7.8.2" }, "bin": { "wait-on": "bin/wait-on" } }, "sha512-rCoJEhvMr0X6alHmwc9abbrA5ZrLZFKpFQVKPNFwl2h7DapXOGdmimIHDtLOWhT4PjhZhxFEtZoQgEXbkDWdZw=="],
@@ -1166,6 +1621,10 @@
 
     "wavesurfer.js": ["wavesurfer.js@7.12.8", "", {}, "sha512-G3nxzcC4X+ZWrLtcIV17kCWHVq3ysJCS4dS0YkGKILrQ2esAb8cScw965zKNKYxUvpiZsPK93KLWgWTYdIBQiw=="],
 
+    "web-namespaces": ["web-namespaces@2.0.1", "", {}, "sha512-bKr1DkiNa2krS7qxNtdrtHAmzuYGFQLiQ13TsorsdT6ULTkPLKuu5+GsFpDlg6JFjUTwX2DyhMPG2be8uPrqsQ=="],
+
+    "web-worker": ["web-worker@1.5.0", "", {}, "sha512-RiMReJrTAiA+mBjGONMnjVDP2u3p9R1vkcGz6gDIrOMT3oGuYwX2WRMYI9ipkphSuE5XKEhydbhNEJh4NY9mlw=="],
+
     "webidl-conversions": ["webidl-conversions@8.0.1", "", {}, "sha512-BMhLD/Sw+GbJC21C/UgyaZX41nPt8bUTg+jWyDeg7e7YN4xOM05YPSIXceACnXVtqyEw/LMClUQMtMZ+PGGpqQ=="],
 
     "whatwg-mimetype": ["whatwg-mimetype@5.0.0", "", {}, "sha512-sXcNcHOC51uPGF0P/D4NVtrkjSU2fNsm9iog4ZvZJsL3rjoDAzXZhkm2MWt1y+PUdggKAYVoMAIYcs78wJ51Cw=="],
@@ -1206,10 +1665,18 @@
 
     "zustand": ["zustand@5.0.14", "", { "peerDependencies": { "@types/react": ">=18.0.0", "immer": ">=9.0.6", "react": ">=18.0.0", "use-sync-external-store": ">=1.2.0" }, "optionalPeers": ["@types/react", "immer", "react", "use-sync-external-store"] }, "sha512-/8tAspM5LMPr28b3fwLYrtdj77ECpfZviaP75CMTnwO8ISyaE4GDIG/9rDDYq/cH9D2Xw2A2RXglLInmVBQB/g=="],
 
+    "zwitch": ["zwitch@2.0.4", "", {}, "sha512-bXE4cR/kVZhKZX/RjPEflHaKVhUVl85noU3v6b8apfQEc1x4A+zBxjZ4lN8LqGd6WZ3dl98pY4o717VFmoPp+A=="],
+
     "@babel/helper-compilation-targets/lru-cache": ["lru-cache@5.1.1", "", { "dependencies": { "yallist": "^3.0.2" } }, "sha512-KpNARQA3Iwv+jTA0utUVVbrh+Jlrr1Fv0e56GGzAFOXN7dk/FviaDW8LHmK52DlcH4WP2n6gI8vN1aesBFgo9w=="],
 
     "@eslint-community/eslint-utils/eslint-visitor-keys": ["eslint-visitor-keys@3.4.3", "", {}, "sha512-wpc+LXeiyiisxPlEkUzU6svyS1frIO3Mgxj1fdy7Pm8Ygzguax2N3Fa/D/ag1WqbOprdI+uY6wMUl8/a2G+iag=="],
 
+    "@floating-ui/core/@floating-ui/utils": ["@floating-ui/utils@0.2.11", "", {}, "sha512-RiB/yIh78pcIxl6lLMG0CgBXAZ2Y0eVHqMPYugu+9U0AeT6YBeiJpf7lbdJNIugFP5SIjwNRgo4DhR1Qxi26Gg=="],
+
+    "@floating-ui/dom/@floating-ui/utils": ["@floating-ui/utils@0.2.11", "", {}, "sha512-RiB/yIh78pcIxl6lLMG0CgBXAZ2Y0eVHqMPYugu+9U0AeT6YBeiJpf7lbdJNIugFP5SIjwNRgo4DhR1Qxi26Gg=="],
+
+    "@floating-ui/vue/@floating-ui/utils": ["@floating-ui/utils@0.2.11", "", {}, "sha512-RiB/yIh78pcIxl6lLMG0CgBXAZ2Y0eVHqMPYugu+9U0AeT6YBeiJpf7lbdJNIugFP5SIjwNRgo4DhR1Qxi26Gg=="],
+
     "@oxc-resolver/binding-wasm32-wasi/@emnapi/core": ["@emnapi/core@1.11.0", "", { "dependencies": { "@emnapi/wasi-threads": "1.2.2", "tslib": "^2.4.0" } }, "sha512-l9Oo58x0HOP5znGzVhYW9U3e5wVuA4LAZU2AGezTmkhO1CgQRFDhDg4nneHsu/t3WniXg9QrG2nIXL/ZS8ln8Q=="],
 
     "@oxc-resolver/binding-wasm32-wasi/@emnapi/runtime": ["@emnapi/runtime@1.11.0", "", { "dependencies": { "tslib": "^2.4.0" } }, "sha512-55coeOFKHv1ywEcUXJtWU5f+Jr/W5tZDvZig8DLKSwUN1JpROQ4rk/SNOQiFWmaR/VKF4zuFyW1B8JduOSv6Pg=="],
@@ -1222,6 +1689,18 @@
 
     "@rolldown/binding-wasm32-wasi/@napi-rs/wasm-runtime": ["@napi-rs/wasm-runtime@1.1.4", "", { "dependencies": { "@tybys/wasm-util": "^0.10.1" }, "peerDependencies": { "@emnapi/core": "^1.7.1", "@emnapi/runtime": "^1.7.1" } }, "sha512-3NQNNgA1YSlJb/kMH1ildASP9HW7/7kYnRI2szWJaofaS1hWmbGI4H+d3+22aGzXXN9IJ+n+GiFVcGipJP18ow=="],
 
+    "@scalar/api-client/nanoid": ["nanoid@5.1.16", "", { "bin": { "nanoid": "bin/nanoid.js" } }, "sha512-kVrnsrJqMR8+oLJnGEmSWw9BivK5mt7H3FZatVRjrc5wGqFYuBxX1yG7+A7Gi5AefkX6t/oCkizcQgpu0cY1dQ=="],
+
+    "@scalar/api-reference/nanoid": ["nanoid@5.1.16", "", { "bin": { "nanoid": "bin/nanoid.js" } }, "sha512-kVrnsrJqMR8+oLJnGEmSWw9BivK5mt7H3FZatVRjrc5wGqFYuBxX1yG7+A7Gi5AefkX6t/oCkizcQgpu0cY1dQ=="],
+
+    "@scalar/icons/chalk": ["chalk@5.6.2", "", {}, "sha512-7NzBL0rN6fMUW+f7A6Io4h40qQlG+xGmtMxfbnH/K7TAtt8JQWVQK+6g0UXKMeVJoyV5EkkNsErQ8pVD3bLHbA=="],
+
+    "@scalar/themes/nanoid": ["nanoid@5.1.16", "", { "bin": { "nanoid": "bin/nanoid.js" } }, "sha512-kVrnsrJqMR8+oLJnGEmSWw9BivK5mt7H3FZatVRjrc5wGqFYuBxX1yG7+A7Gi5AefkX6t/oCkizcQgpu0cY1dQ=="],
+
+    "@scalar/types/nanoid": ["nanoid@5.1.16", "", { "bin": { "nanoid": "bin/nanoid.js" } }, "sha512-kVrnsrJqMR8+oLJnGEmSWw9BivK5mt7H3FZatVRjrc5wGqFYuBxX1yG7+A7Gi5AefkX6t/oCkizcQgpu0cY1dQ=="],
+
+    "@scalar/use-hooks/tailwind-merge": ["tailwind-merge@3.5.0", "", {}, "sha512-I8K9wewnVDkL1NTGoqWmVEIlUcB9gFriAEkXkfCjX5ib8ezGxtR3xD7iZIxrfArjEsH7F1CHD4RFUtxefdqV/A=="],
+
     "@tailwindcss/oxide-wasm32-wasi/@emnapi/core": ["@emnapi/core@1.10.0", "", { "dependencies": { "@emnapi/wasi-threads": "1.2.1", "tslib": "^2.4.0" }, "bundled": true }, "sha512-yq6OkJ4p82CAfPl0u9mQebQHKPJkY7WrIuk205cTYnYe+k2Z8YBh11FrbRG/H6ihirqcacOgl2BIO8oyMQLeXw=="],
 
     "@tailwindcss/oxide-wasm32-wasi/@emnapi/runtime": ["@emnapi/runtime@1.10.0", "", { "dependencies": { "tslib": "^2.4.0" }, "bundled": true }, "sha512-ewvYlk86xUoGI0zQRNq/mC+16R1QeDlKQy21Ki3oSYXNgLb45GV1P6A0M+/s6nyCuNDqe5VpaY84BzXGwVbwFA=="],
@@ -1234,6 +1713,8 @@
 
     "@tailwindcss/oxide-wasm32-wasi/tslib": ["tslib@2.8.1", "", { "bundled": true }, "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w=="],
 
+    "@tanstack/vue-virtual/@tanstack/virtual-core": ["@tanstack/virtual-core@3.17.3", "", {}, "sha512-8Np/TFELpI0ySuJoVmjvOrQYXH/8sTX0Biv9szhFhY39xOdAAY+smrMxjxOum/ux3eM8MUJQsEJ0/R0UpvC8dw=="],
+
     "@tauri-apps/plugin-process/@tauri-apps/api": ["@tauri-apps/api@2.10.1", "", {}, "sha512-hKL/jWf293UDSUN09rR69hrToyIXBb8CjGaWC7gfinvnQrBVvnLr08FeFi38gxtugAVyVcTa5/FD/Xnkb1siBw=="],
 
     "@tauri-apps/plugin-updater/@tauri-apps/api": ["@tauri-apps/api@2.10.1", "", {}, "sha512-hKL/jWf293UDSUN09rR69hrToyIXBb8CjGaWC7gfinvnQrBVvnLr08FeFi38gxtugAVyVcTa5/FD/Xnkb1siBw=="],
@@ -1244,8 +1725,26 @@
 
     "@testing-library/dom/dom-accessibility-api": ["dom-accessibility-api@0.5.16", "", {}, "sha512-X7BJ2yElsnOJ30pZF4uIIDfBEVgF4XEBxL9Bxhy6dnrm5hkzqmsWHGTiHqRiITNhMyFLyAiWndIJP7Z1NTteDg=="],
 
+    "@vue/compiler-core/@babel/parser": ["@babel/parser@7.29.7", "", { "dependencies": { "@babel/types": "^7.29.7" }, "bin": "./bin/babel-parser.js" }, "sha512-hnORnjP/1P/zFEndoeX+n+t1RwWRJiJpM/jO7FW32Kn9r5+sJB2JWOdYo4L6k78j15eCwY3Gm/7364B1EMwtNg=="],
+
+    "@vue/compiler-core/entities": ["entities@7.0.1", "", {}, "sha512-TWrgLOFUQTH994YUyl1yT4uyavY5nNB5muff+RtWaqNVCAK408b5ZnnbNAUEWLTCpum9w6arT70i1XdQ4UeOPA=="],
+
+    "@vue/compiler-core/estree-walker": ["estree-walker@2.0.2", "", {}, "sha512-Rfkk/Mp/DL7JVje3u18FxFujQlTNR2q6QfMSMB7AvCBx91NGj/ba3kCfza0f6dVDbw7YlRf/nDrn7pQrCCyQ/w=="],
+
+    "@vue/compiler-sfc/@babel/parser": ["@babel/parser@7.29.7", "", { "dependencies": { "@babel/types": "^7.29.7" }, "bin": "./bin/babel-parser.js" }, "sha512-hnORnjP/1P/zFEndoeX+n+t1RwWRJiJpM/jO7FW32Kn9r5+sJB2JWOdYo4L6k78j15eCwY3Gm/7364B1EMwtNg=="],
+
+    "@vue/compiler-sfc/estree-walker": ["estree-walker@2.0.2", "", {}, "sha512-Rfkk/Mp/DL7JVje3u18FxFujQlTNR2q6QfMSMB7AvCBx91NGj/ba3kCfza0f6dVDbw7YlRf/nDrn7pQrCCyQ/w=="],
+
     "chalk/supports-color": ["supports-color@7.2.0", "", { "dependencies": { "has-flag": "^4.0.0" } }, "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw=="],
 
+    "hast-util-from-html/parse5": ["parse5@7.3.0", "", { "dependencies": { "entities": "^6.0.0" } }, "sha512-IInvU7fabl34qmi9gY8XOVxhYyMyuH2xUNpb2q8/Y+7552KlejkRvqvD19nMoUW/uQGGbqNpA6Tufu5FL5BZgw=="],
+
+    "hast-util-raw/parse5": ["parse5@7.3.0", "", { "dependencies": { "entities": "^6.0.0" } }, "sha512-IInvU7fabl34qmi9gY8XOVxhYyMyuH2xUNpb2q8/Y+7552KlejkRvqvD19nMoUW/uQGGbqNpA6Tufu5FL5BZgw=="],
+
+    "make-asynchronous/type-fest": ["type-fest@4.41.0", "", {}, "sha512-TeTSQ6H5YHvpqVwBRcnLDCBnDOHWYu7IvGbHT6N8AOymcr9PJGjc1GTtiWZTYg0NCgYwvnYWEkVChQAr9bjfwA=="],
+
+    "mdast-util-find-and-replace/escape-string-regexp": ["escape-string-regexp@5.0.0", "", {}, "sha512-/veY75JbMK4j1yjvuUxuVsiS/hr/4iHs9FTT6cgTexxdE0Ly/glccBAkloH/DofkjRbZU3bnoj38mOmhkZ0lHw=="],
+
     "npm-run-path/path-key": ["path-key@4.0.0", "", {}, "sha512-haREypq7xkM7ErfgIyA0z+Bj4AGKlMSdlQE2jvJo6huWD1EdkKYV+G/T4nq0YEF2vgTT8kqMFKo1uHn950r4SQ=="],
 
     "playwright/playwright-core": ["playwright-core@1.60.0", "", { "bin": { "playwright-core": "cli.js" } }, "sha512-9bW6zvX/m0lEbgTKJ6YppOKx8H3VOPBMOCFh2irXFOT4BbHgrx5hPjwJYLT40Lu+4qtD36qKc/Hn56StUW57IA=="],
@@ -1254,6 +1753,12 @@
 
     "qrcode/yargs": ["yargs@15.4.1", "", { "dependencies": { "cliui": "^6.0.0", "decamelize": "^1.2.0", "find-up": "^4.1.0", "get-caller-file": "^2.0.1", "require-directory": "^2.1.1", "require-main-filename": "^2.0.0", "set-blocking": "^2.0.0", "string-width": "^4.2.0", "which-module": "^2.0.0", "y18n": "^4.0.0", "yargs-parser": "^18.1.2" } }, "sha512-aePbxDmcYW++PaqBsJ+HYUFwCdv4LVvdnhBy78E57PIor8/OVvhMrADFFEDh8DHDFRv/O9i3lPhsENjO7QX0+A=="],
 
+    "radix-vue/@vueuse/core": ["@vueuse/core@10.11.1", "", { "dependencies": { "@types/web-bluetooth": "^0.0.20", "@vueuse/metadata": "10.11.1", "@vueuse/shared": "10.11.1", "vue-demi": ">=0.14.8" } }, "sha512-guoy26JQktXPcz+0n3GukWIy/JDNKti9v6VEMu6kV2sYBsWuGiTU8OWdg+ADfUbHg3/3DlqySDe7JmdHrktiww=="],
+
+    "radix-vue/@vueuse/shared": ["@vueuse/shared@10.11.1", "", { "dependencies": { "vue-demi": ">=0.14.8" } }, "sha512-LHpC8711VFZlDaYUXEBbFBCQ7GS3dVU9mjOhhMhXP6txTV4EhYQg/KGnQuvt/sPAtoUKq7VVUnL6mVtFoL42sA=="],
+
+    "radix-vue/nanoid": ["nanoid@5.1.16", "", { "bin": { "nanoid": "bin/nanoid.js" } }, "sha512-kVrnsrJqMR8+oLJnGEmSWw9BivK5mt7H3FZatVRjrc5wGqFYuBxX1yG7+A7Gi5AefkX6t/oCkizcQgpu0cY1dQ=="],
+
     "rolldown/@oxc-project/types": ["@oxc-project/types@0.133.0", "", {}, "sha512-KzkdCd6Uxqnf6l3HOw1xfatAlUURA0g14cvBYFyJ5SaNOQbOUvBr9PKArcPcrNIeRsBdgcUzOGrhKveVpvOIGA=="],
 
     "vite/fsevents": ["fsevents@2.3.3", "", { "os": "darwin" }, "sha512-5xoDfX+fL7faATnagmWPpbFtwh/R77WmMMqqHGS65C3vvB0YHrgF+B1YmZ3441tMj5n63k0212XNoJwzlhffQw=="],
@@ -1268,6 +1773,14 @@
 
     "@tailwindcss/oxide-wasm32-wasi/@napi-rs/wasm-runtime/@tybys/wasm-util": ["@tybys/wasm-util@0.10.1", "", { "dependencies": { "tslib": "^2.4.0" } }, "sha512-9tTaPJLSiejZKx+Bmog4uSubteqTvFrVrURwkmHixBo0G4seD0zUxp98E1DzUBJxLQ3NPwXrGKDiVjwx/DpPsg=="],
 
+    "@vue/compiler-core/@babel/parser/@babel/types": ["@babel/types@7.29.7", "", { "dependencies": { "@babel/helper-string-parser": "^7.29.7", "@babel/helper-validator-identifier": "^7.29.7" } }, "sha512-4zBIxpPzowiZpusoFkyGVwakdRJUyuH5PxQ/PrqghfdFWWasvnCdPfQXHrenDai+gyLARulZjZowCOj6fjT4pA=="],
+
+    "@vue/compiler-sfc/@babel/parser/@babel/types": ["@babel/types@7.29.7", "", { "dependencies": { "@babel/helper-string-parser": "^7.29.7", "@babel/helper-validator-identifier": "^7.29.7" } }, "sha512-4zBIxpPzowiZpusoFkyGVwakdRJUyuH5PxQ/PrqghfdFWWasvnCdPfQXHrenDai+gyLARulZjZowCOj6fjT4pA=="],
+
+    "hast-util-from-html/parse5/entities": ["entities@6.0.1", "", {}, "sha512-aN97NXWF6AWBTahfVOIrB/NShkzi5H7F9r1s9mD3cDj4Ko5f2qhhVoYMibXF7GlLveb/D2ioWay8lxI97Ven3g=="],
+
+    "hast-util-raw/parse5/entities": ["entities@6.0.1", "", {}, "sha512-aN97NXWF6AWBTahfVOIrB/NShkzi5H7F9r1s9mD3cDj4Ko5f2qhhVoYMibXF7GlLveb/D2ioWay8lxI97Ven3g=="],
+
     "qrcode/yargs/cliui": ["cliui@6.0.0", "", { "dependencies": { "string-width": "^4.2.0", "strip-ansi": "^6.0.0", "wrap-ansi": "^6.2.0" } }, "sha512-t6wbgtoCXvAzst7QgXxJYqPt0usEfbgQdftEPbLL/cvv6HPE5VgvqCuAIDR0NgU52ds6rFwqrgakNLrHEjCbrQ=="],
 
     "qrcode/yargs/find-up": ["find-up@4.1.0", "", { "dependencies": { "locate-path": "^5.0.0", "path-exists": "^4.0.0" } }, "sha512-PpOwAdQ/YlXQ2vj8a3h8IipDuYRi3wceVQQGYWxNINccq40Anw7BlsEXCMbt1Zt+OLA6Fq9suIpIWD0OsnISlw=="],
@@ -1276,6 +1789,18 @@
 
     "qrcode/yargs/yargs-parser": ["yargs-parser@18.1.3", "", { "dependencies": { "camelcase": "^5.0.0", "decamelize": "^1.2.0" } }, "sha512-o50j0JeToy/4K6OZcaQmW6lyXXKhq7csREXcDwk2omFPJEwUNOVtJKvmDr9EI1fAJZUyZcRF7kxGBWmRXudrCQ=="],
 
+    "radix-vue/@vueuse/core/@types/web-bluetooth": ["@types/web-bluetooth@0.0.20", "", {}, "sha512-g9gZnnXVq7gM7v3tJCWV/qw7w+KeOlSHAhgF9RytFyifW6AF61hdT2ucrYhPq9hLs5JIryeupHV3qGk95dH9ow=="],
+
+    "radix-vue/@vueuse/core/@vueuse/metadata": ["@vueuse/metadata@10.11.1", "", {}, "sha512-IGa5FXd003Ug1qAZmyE8wF3sJ81xGLSqTqtQ6jaVfkeZ4i5kS2mwQF61yhVqojRnenVew5PldLyRgvdl4YYuSw=="],
+
+    "@vue/compiler-core/@babel/parser/@babel/types/@babel/helper-string-parser": ["@babel/helper-string-parser@7.29.7", "", {}, "sha512-Pb5ijPrZ89GDH8223L4UP8i6QApWxs04RbPQJTeWDV0/keR2E36MeKnyr6LYmUUvqRRI+Iv87SuF1W6ErINzYw=="],
+
+    "@vue/compiler-core/@babel/parser/@babel/types/@babel/helper-validator-identifier": ["@babel/helper-validator-identifier@7.29.7", "", {}, "sha512-qehxGkRj55h/ff8EMaJ+cYhyaKlHIxqYDn682wQD7RNp9UujOQsHog2uS0r2vzr4pW+sXf90NeeayjcNaX3fFg=="],
+
+    "@vue/compiler-sfc/@babel/parser/@babel/types/@babel/helper-string-parser": ["@babel/helper-string-parser@7.29.7", "", {}, "sha512-Pb5ijPrZ89GDH8223L4UP8i6QApWxs04RbPQJTeWDV0/keR2E36MeKnyr6LYmUUvqRRI+Iv87SuF1W6ErINzYw=="],
+
+    "@vue/compiler-sfc/@babel/parser/@babel/types/@babel/helper-validator-identifier": ["@babel/helper-validator-identifier@7.29.7", "", {}, "sha512-qehxGkRj55h/ff8EMaJ+cYhyaKlHIxqYDn682wQD7RNp9UujOQsHog2uS0r2vzr4pW+sXf90NeeayjcNaX3fFg=="],
+
     "qrcode/yargs/cliui/wrap-ansi": ["wrap-ansi@6.2.0", "", { "dependencies": { "ansi-styles": "^4.0.0", "string-width": "^4.1.0", "strip-ansi": "^6.0.0" } }, "sha512-r6lPcBGxZXlIcymEu7InxDMhdW0KDxpLgoFLcguasxCaJ/SOIZwINatK9KY/tf+ZrlywOKU0UDj3ATXUBfxJXA=="],
 
     "qrcode/yargs/find-up/locate-path": ["locate-path@5.0.0", "", { "dependencies": { "p-locate": "^4.1.0" } }, "sha512-t7hw9pI+WvuwNJXwk5zVHpyhIqzg2qTlklJOf0mVxGSbe3Fp2VieZcduNYjaLDoy6p9uGpQEGWG87WpMKlNq8g=="],

docs/downloading-models.md

@@ -82,8 +82,12 @@ If `huggingface.co` is slow or blocked, point the client at a mirror:
 HF_ENDPOINT=https://hf-mirror.com
 ```
 
-Set it as an environment variable (or in **Settings → environment**) before
-downloading. Caveats:
+Set it in **Settings → Models → Hugging Face mirror** (quick-pick presets
+included), or as an environment variable before launching. On first run, the
+setup wizard offers the same mirror quick-pick right on the system-check
+screen when the endpoint is unreachable — the network check is a warning, not
+a blocker, so an offline or firewalled machine can still finish setup once
+models are available (mirror, or manual download below). Caveats:
 
 - A mirror serves the **classic** download path, **not Xet** — you lose
   chunk-dedup and Xet's parallel fetch, but you gain reachability. On the

docs/dubbing/translation-engines.md

@@ -102,6 +102,38 @@ provider via environment variables (e.g. `GROQ_API_KEY`, or the legacy
 `TRANSLATE_BASE_URL` / `TRANSLATE_API_KEY` / `TRANSLATE_MODEL`, which map to the
 **Custom** provider).
 
+### Pinning the active provider with `LLM_DEFAULT_PROVIDER`
+
+By default the LLM used for Cinematic/Autofit is the one you mark "use for
+translation" in **Settings → LLM Providers**. To force a specific provider
+regardless of that stored selection — handy for headless/CI/Docker runs or a
+shared machine — set the `LLM_DEFAULT_PROVIDER` environment variable to a
+provider id before launching the backend:
+
+```
+LLM_DEFAULT_PROVIDER=groq        # or openai, openrouter, cerebras, ollama, custom, …
+```
+
+Resolution order for the active provider is: `LLM_DEFAULT_PROVIDER` (env) →
+your saved selection → the first provider that has a key → none. The id must be
+one OmniVoice knows (the ids shown in **Settings → LLM Providers**); an unknown
+value is ignored and resolution falls through to your saved selection. While
+this env var is set it wins over the in-app picker, so if the UI selection
+appears to have "no effect," check whether `LLM_DEFAULT_PROVIDER` is exported.
+
+## LLM Skills (per-feature routing)
+
+**Settings → System → LLM Skills** lists every LLM-powered feature — Cinematic &
+Autofit translation, speech-rate slot fitting, glossary auto-extract, direction
+parsing, and dictation cleanup — and lets you toggle each one or route it to a
+specific provider instead of the global active one. That way sensitive work
+(e.g. dictation cleanup) can stay on a local Ollama/LM Studio model while
+heavier jobs use a remote provider. A disabled skill degrades exactly like
+having no LLM configured: Cinematic/Autofit falls back to Fast, dictation
+cleanup passes the raw transcript through, direction parsing uses the keyword
+heuristic. Everything defaults to enabled + "use active provider", so existing
+setups behave unchanged.
+
 ## API keys (online MT engines)
 
 The non-LLM online engines need a key, set as an environment variable before

docs/generation-parameters.md

@@ -56,6 +56,8 @@ Priority: `duration` > `speed`.
 | `preprocess_prompt` | bool | True | Whether to apply preprocessing to the voice-clone prompt audio (remove long silences in reference audio, add punctuation in the end of reference text). |
 | `postprocess_output` | bool | True | Apply post-processing to generated audio (remove long silences). |
 
+> **Tip — reference-clip quality transfers.** Zero-shot cloning mirrors the acoustics of the reference clip, not just the voice: a clip recorded in an echoey room clones echoey. Record dry and close-mic for clean output. No effect preset adds reverb unless you choose one that declares it (Cinematic, Warm).
+
 ## Long-Form Generation
 
 To support stable long-form speech generation with low VRAM consumption, the text is automatically split into smaller segments when the estimated duration of the generated speech exceeds `audio_chunk_duration`, with each segment producing approximately `audio_chunk_duration` seconds of audio. This approach allows the model to accept arbitrarily long text and generate arbitrarily long speech with near-constant VRAM consumption.

docs/install/linux.md

@@ -5,13 +5,32 @@ working OmniVoice Studio install on a Debian / Ubuntu / Fedora / Arch host.
 
 ## Prerequisites
 
+### Using the AppImage
+
 - **Linux x86_64** with a desktop session (X11 or Wayland) capable of running
   a Tauri / WebKitGTK app.
+- **~10 GB free disk** for the app, its Python environment, and model weights.
+- Optional: an **NVIDIA driver** for CUDA GPU acceleration — the app runs
+  CPU-only without one. For AMD GPUs see [AMD GPU (ROCm)](#amd-gpu-rocm).
+- Optional: **yt-dlp** for downloading YouTube/video clips directly in the
+  Voice Gallery and Dub tabs — `sudo apt install yt-dlp` (Debian/Ubuntu),
+  `sudo dnf install yt-dlp` (Fedora), or `sudo pacman -S yt-dlp` (Arch).
+  Without it those downloads fail; everything else works fine.
+
+That's it — Python, FFmpeg, and the model weights are bundled or bootstrapped
+by the app itself on first launch. No toolchain needed.
+
+### Building from source
+
+Everything above, plus the toolchain:
+
+- **git** — `sudo apt install git` (Debian/Ubuntu), `sudo dnf install git` (Fedora), or `sudo pacman -S git` (Arch).
+- **curl** — usually preinstalled; used by the Bun and rustup install one-liners below.
 - **Python 3.11+** — typically `sudo apt install python3.11` on Debian/Ubuntu,
   `sudo dnf install python3.11` on Fedora, or already installed on Arch.
 - **Bun** — `curl -fsSL https://bun.sh/install | bash`.
 - **FFmpeg** — `sudo apt install ffmpeg` (Debian/Ubuntu), `sudo dnf install ffmpeg-free` (Fedora), or `sudo pacman -S ffmpeg` (Arch).
-- **Rust / Cargo** (required for building from source only) — `curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh` or via your package manager (e.g., `sudo apt install rustc cargo`).
+- **Rust / Cargo** — `curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh` or via your package manager (e.g., `sudo apt install rustc cargo`).
   If you use rustup, reopen the shell or source `"$HOME/.cargo/env"` before running `bun run desktop-prod`.
 - **GTK/WebKit deps** for the Tauri shell:
 
@@ -58,12 +77,15 @@ No FUSE? Use `--appimage-extract-and-run`:
 ./OmniVoice.Studio_*.AppImage --appimage-extract-and-run
 ```
 
-## Install (.deb)
+## .deb package
 
-```bash
-sudo apt install ./OmniVoice.Studio_*.amd64.deb
-omnivoice-studio
-```
+Not currently published: `.deb` bundling is disabled in the release pipeline
+because of a `tauri-cli` bug (`Failed to create control scripts`) — see the
+comment in `.github/workflows/release.yml` for the tracking note. The
+AppImage above is the supported Linux install path until a `tauri-cli`
+version resolves it. `apt install`-able `.deb`s shipped before v0.3 (see
+[.deb ffprobe conflict](#deb-ffprobe-conflict) below) if you're upgrading
+from one of those.
 
 The desktop app uses these canonical paths (kept in sync with
 `scripts/desktop-prod.sh` by the docs-drift CI gate):
@@ -74,24 +96,49 @@ APP_ID="com.debpalash.omnivoice-studio"
 APP_NAME="OmniVoice Studio"
 ```
 
-## AppImage white-screen on Fedora 44 / Ubuntu 24.04
+## AppImage white screen / EGL errors (Fedora 44, Ubuntu 24.04+, 26.04)
 
 <a id="appimage-white-screen-on-fedora-44--ubuntu-2404"></a>
 
-Newer distros ship WebKitGTK 2.44 / 2.46, which has a compositing-mode
-regression that lands the Tauri window as a fully-white frame with no UI.
+Two separate WebKitGTK rendering issues land the Tauri window as a
+fully-white frame with no UI. Which one you have depends on your WebKitGTK
+version (`pkg-config --modversion webkit2gtk-4.1` prints it).
 
-**Workaround:** set `WEBKIT_DISABLE_COMPOSITING_MODE=1` before launching:
+**Modern WebKitGTK (2.48+ — Ubuntu 24.04 and newer, incl. 26.04): try this
+first.** WebKit's DMA-BUF renderer fails against some GPU drivers; the
+terminal typically shows:
+
+```
+Could not create default EGL display: EGL_BAD_PARAMETER
+```
+
+Disable the DMA-BUF renderer before launching:
+
+```bash
+WEBKIT_DISABLE_DMABUF_RENDERER=1 ./OmniVoice.Studio_*.AppImage
+```
+
+**WebKitGTK 2.44 / 2.46 (Fedora 44, Ubuntu 24.04 at release):** a
+compositing-mode regression blanks the surface on first paint. Disable
+compositing mode instead:
 
 ```bash
 WEBKIT_DISABLE_COMPOSITING_MODE=1 ./OmniVoice.Studio_*.AppImage
 ```
 
-OmniVoice's AppRun launcher autodetects the broken WebKitGTK range and sets
-this for you (shipped in v0.3+). The manual env-var path remains the documented
-fallback when running from a checked-out source tree.
+OmniVoice's AppRun launcher autodetects the broken 2.44/2.46 range and sets
+this second variable for you (shipped in v0.3+). The manual env-var path
+remains the documented fallback when running from a checked-out source tree.
 
-Tracking issue: [#62](https://github.com/debpalash/OmniVoice-Studio/issues/62).
+**Last resort** — if neither variable alone helps, force software rendering
+(slower, but always paints):
+
+```bash
+WEBKIT_DISABLE_DMABUF_RENDERER=1 LIBGL_ALWAYS_SOFTWARE=1 ./OmniVoice.Studio_*.AppImage
+```
+
+Tracking issues: [#62](https://github.com/debpalash/OmniVoice-Studio/issues/62),
+[#961](https://github.com/debpalash/OmniVoice-Studio/issues/961).
 
 ## .deb ffprobe conflict
 
@@ -134,36 +181,67 @@ that picks these defaults automatically; for v0.3 set them by hand.
 
 <a id="amd-gpu-rocm"></a>
 
-OmniVoice **auto-detects AMD GPUs** — `get_best_device()` returns the GPU when a
-ROCm build of PyTorch is installed (ROCm-built PyTorch reports through
-`torch.cuda.is_available()`), and OmniVoice auto-sets `HSA_OVERRIDE_GFX_VERSION`
-for consumer cards whose GFX ID isn't in the official ROCm support matrix. No
-code changes or flags are needed.
+ROCm support is **Linux-only and opt-in**. The **default install ships the
+CUDA build** of PyTorch (the `pytorch-cuda` index in `pyproject.toml`), so on
+an AMD-only machine `torch.cuda.is_available()` is `False` and OmniVoice runs
+on CPU until you opt into the ROCm variant. (On Windows there is no ROCm path
+at all — PyTorch publishes no Windows ROCm wheels; see
+[windows.md](windows.md#gpu-support).)
 
-The catch: the **default install ships the CUDA build** of PyTorch (the
-`pytorch-cuda` index in `pyproject.toml`), so on an AMD-only machine
-`torch.cuda.is_available()` is `False` and OmniVoice falls back to CPU. To use
-your AMD GPU, replace torch with the ROCm wheel **after** the first-run install
-populates the venv:
+Three ways to opt in, in order of preference:
+
+**1. First-run setup screen (recommended).** On Linux the setup screen's
+**Compute** card offers **"AMD GPU (ROCm, Linux)"** next to the default
+**Auto**. When OmniVoice detects an AMD GPU *and* the ROCm userspace
+(`/opt/rocm` present, or `rocminfo` on PATH), the ROCm option is pre-selected;
+with an AMD GPU but no ROCm runtime it stays offered-but-unselected — install
+ROCm first (or continue on CPU). Choosing ROCm makes the bootstrap reinstall
+`torch`/`torchaudio` from the ROCm wheel index
+(`https://download.pytorch.org/whl/rocm6.4` by default) right after the
+dependency sync — matched to the app's pinned `torch==2.8.0` (the rocm6.2
+index only ever published up to torch 2.5.1, so it silently failed the
+reinstall and left the CPU-only CUDA build in place).
+
+**2. Environment variable (existing installs / headless).** Set
+`OMNIVOICE_TORCH_VARIANT=rocm` before launching — the next bootstrap performs
+the same ROCm reinstall. `OMNIVOICE_TORCH_INDEX=<url>` overrides the wheel
+index when you need a different ROCm version — e.g. AMD publishes newer
+driver-matched builds (7.2.x) at `repo.radeon.com` as a `--find-links` page
+rather than a PyPI-style index:
+```bash
+uv pip install --reinstall torch==2.8.0 torchaudio==2.8.0 \
+  --find-links https://repo.radeon.com/rocm/manylinux/rocm-rel-7.2.4/
+```
+run that manually if you want a specific ROCm point release; the
+`OMNIVOICE_TORCH_INDEX` env var only accepts a PEP 503 index URL, not a
+find-links page. If the reinstall fails (network, unsupported card), OmniVoice
+keeps the default torch build and warns instead of breaking the install.
+
+**3. Manual wheel swap (fallback).** Replace torch with the ROCm wheel
+**after** the first-run install populates the venv:
 
 ```bash
 # From the project directory (source install), into OmniVoice's uv venv.
-# Current stable is ROCm 6.2 — match your installed ROCm/driver version
-# (https://pytorch.org/get-started/locally/ lists available wheels).
+# Matches the app's torch==2.8.0 pin — a different ROCm point release
+# (e.g. rocm6.2, rocm7.x) may not carry that exact torch build.
 uv pip install --reinstall torch torchaudio \
-  --index-url https://download.pytorch.org/whl/rocm6.2
+  --index-url https://download.pytorch.org/whl/rocm6.4
 ```
 
-Then relaunch — the Settings → System panel should now report the GPU device
-instead of `cpu`. Verify the wheel sees your card:
+Once a ROCm build of PyTorch is in the venv, detection is automatic —
+`get_best_device()` returns the GPU (ROCm-built PyTorch reports through
+`torch.cuda.is_available()`), and OmniVoice auto-sets
+`HSA_OVERRIDE_GFX_VERSION` for consumer cards whose GFX ID isn't in the
+official ROCm support matrix. Relaunch and the Settings → System panel should
+report the GPU device instead of `cpu`. Verify the wheel sees your card:
 
 ```bash
 uv run python -c "import torch; print(torch.cuda.is_available(), torch.cuda.get_device_name(0))"
 ```
 
 Notes:
-- ROCm is **Linux-only** and **opt-in** — the default cross-platform behavior
-  (CUDA on NVIDIA, MPS on Apple, CPU elsewhere) is unchanged.
+- ROCm is exercised far less than the default CUDA/MPS/CPU paths — it works,
+  but expect rough edges on consumer cards and report what you hit.
 - Unsupported GFX (e.g. some consumer RDNA cards): if it still won't run, set
   `HSA_OVERRIDE_GFX_VERSION` yourself (e.g. `export HSA_OVERRIDE_GFX_VERSION=11.0.0`)
   to the nearest supported architecture before launching.
@@ -171,8 +249,6 @@ Notes:
   native ROCm wheel.
 
 Tracking issue: [#124](https://github.com/debpalash/OmniVoice-Studio/issues/124).
-An installer-integrated, env-var-driven ROCm wheel selection is a planned
-follow-up; until then this manual step is the supported path.
 
 ## Hugging Face token (optional but recommended)
 

docs/install/macos.md

@@ -1,21 +1,42 @@
 # OmniVoice Studio — Install on macOS
 
 This page is self-contained: follow it top to bottom and you'll end up with a
-working OmniVoice Studio install on macOS (Apple Silicon or Intel).
+working OmniVoice Studio install on macOS (Apple Silicon).
 
-> **Intel Macs:** the pre-built `.app`/DMG currently ships **Apple Silicon
-> only** — on Intel, install **from source** (works fully; ASR falls back to
-> CTranslate2). A pre-built Intel bundle is tracked in
-> [#279](https://github.com/debpalash/OmniVoice-Studio/issues/279).
+> [!IMPORTANT]
+> **Intel Macs are not supported.** The app UI installs and launches, but the
+> local Python backend **cannot run**: PyTorch stopped shipping Intel-Mac
+> (macOS x86_64) wheels after 2.2.x, and OmniVoice's dependencies require a
+> newer torch — so the first-run dependency install can never succeed, from
+> the DMG *or* from source
+> ([#889](https://github.com/debpalash/OmniVoice-Studio/issues/889)). The app
+> detects this at first launch and tells you directly instead of failing with
+> a raw installer error. Your options on an Intel Mac: point the UI at a
+> remote backend running on another machine (**Settings → Sharing → Remote
+> backend**), or run OmniVoice on an Apple Silicon Mac, Windows, or Linux.
 
 ## Prerequisites
 
-- **macOS 12 (Monterey) or newer** — Apple Silicon or Intel.
+### Using the DMG
+
+- **macOS 12 (Monterey) or newer** — Apple Silicon (Intel: UI only, see the
+  note above).
+- **~10 GB free disk** for the app, its Python environment, and model weights.
+
+That's it — GPU acceleration (Apple MPS) is automatic on Apple Silicon, and
+Python, FFmpeg, and the model weights are bundled or bootstrapped by the app
+itself on first launch. No toolchain needed.
+
+### Building from source
+
+Everything above, plus the toolchain:
+
+- **Xcode Command Line Tools** — `xcode-select --install` (includes **git**
+  and the C toolchain; `curl` ships with macOS).
 - **Python 3.11+** — `brew install python@3.11` (or use `pyenv` / the system Python if you already have ≥3.11).
 - **Bun** — `curl -fsSL https://bun.sh/install | bash`.
-- **Xcode Command Line Tools** — `xcode-select --install`.
 - **FFmpeg** (used by the dubbing + capture pipelines) — `brew install ffmpeg`.
-- **Rust / Cargo** (required for building from source only) — `curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh` or `brew install rust`.
+- **Rust / Cargo** — `curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh` or `brew install rust`.
   If you use rustup, reopen the terminal or source `"$HOME/.cargo/env"` before running `bun run desktop-prod`.
 
 Optional but recommended:
@@ -47,13 +68,15 @@ Pick the DMG that matches your Mac (check **Apple menu → About This Mac → Ch
 | Mac | DMG to download |
 |-----|-----------------|
 | Apple Silicon (M1/M2/M3/M4…) | `OmniVoice.Studio_<version>_aarch64.dmg` |
-| Intel | `OmniVoice.Studio_<version>_x64.dmg` |
+| Intel | `OmniVoice.Studio_<version>_x64.dmg` — **UI only**: the local backend cannot run on Intel ([#889](https://github.com/debpalash/OmniVoice-Studio/issues/889)) |
 
 The architectures are **not** interchangeable: an Intel Mac cannot run the
 `aarch64` build (Rosetta 2 only translates the other direction — it lets Apple
-Silicon run Intel apps, never the reverse). If a release predates the Intel
-build target and has no `x64` DMG, use the
-[install-from-source path](#install-from-source) above instead.
+Silicon run Intel apps, never the reverse). And note the Intel caveat above:
+the `x64` DMG installs and launches, but is only useful together with a
+remote backend — the local Python backend cannot install on Intel because
+PyTorch no longer ships Intel-Mac wheels. Installing from source does not
+help; the dependency resolution fails the same way.
 
 If the first launch is blocked by macOS Gatekeeper ("OmniVoice Studio cannot be
 opened because the developer cannot be verified"), see the next section — it
@@ -123,8 +146,11 @@ without the quarantine step.
 - **Apple Silicon (M-series):** OmniVoice automatically picks the `mlx-whisper`
   and `mlx-audio` backends where available — these use the Apple Neural Engine
   and Metal Performance Shaders for ~2× the throughput of the CPU path.
-- **Intel macs:** falls back to `faster-whisper` (CTranslate2) on CPU. Still
-  fast; just no ANE acceleration.
+- **Intel Macs:** the local backend is **unsupported** — PyTorch no longer
+  ships Intel-Mac wheels, so the Python environment can never install
+  ([#889](https://github.com/debpalash/OmniVoice-Studio/issues/889)). The UI
+  works only when pointed at a remote backend (**Settings → Sharing → Remote
+  backend**).
 
 The picker in **Settings → Engines** shows which backend is active.
 

docs/install/troubleshooting.md

@@ -115,13 +115,22 @@ quarantines every download.
 
 **Fix:** see [macos.md#gatekeeper-quarantine](macos.md#gatekeeper-quarantine).
 
-## 4. AppImage white screen on Fedora 44 / Ubuntu 24.04
+## 4. AppImage white screen / EGL errors (Fedora 44, Ubuntu 24.04+, 26.04)
 
-**Symptom:** the AppImage window opens fully white. No UI ever appears.
+**Symptom:** the AppImage window opens fully white. No UI ever appears. On
+newer distros (Ubuntu 24.04 and later, incl. 26.04) the terminal often shows
+`Could not create default EGL display: EGL_BAD_PARAMETER`.
 
-**Cause:** WebKitGTK 2.44 / 2.46 compositing-mode regression.
+**Cause:** WebKitGTK rendering regressions — the DMA-BUF renderer on modern
+WebKitGTK (2.48+), or the 2.44 / 2.46 compositing mode.
 
-**Fix:** see [linux.md#appimage-white-screen-on-fedora-44--ubuntu-2404](linux.md#appimage-white-screen-on-fedora-44--ubuntu-2404).
+**Fix:** try `WEBKIT_DISABLE_DMABUF_RENDERER=1` first (modern WebKitGTK / the
+EGL error), then `WEBKIT_DISABLE_COMPOSITING_MODE=1` — full walkthrough incl.
+the software-rendering last resort:
+[linux.md#appimage-white-screen-on-fedora-44--ubuntu-2404](linux.md#appimage-white-screen-on-fedora-44--ubuntu-2404).
+
+**Linked issues:** [#62](https://github.com/debpalash/OmniVoice-Studio/issues/62),
+[#961](https://github.com/debpalash/OmniVoice-Studio/issues/961)
 
 ## 5. Windows Triton / torch.compile OOM
 
@@ -179,9 +188,11 @@ falling back to faster-whisper`.
 
 **Cause:** `mlx-whisper` and `mlx-audio` only build for arm64 (Apple Silicon).
 
-**Fix:** none needed — `faster-whisper` (CTranslate2) is the supported Intel
-path and is still fast. If you want the latest CT2 wheels, run `uv sync`
-from a fresh source checkout.
+**Fix:** none needed on Apple Silicon setups that log this transiently. Note
+that Intel Macs can no longer run the local backend at all — PyTorch dropped
+Intel-Mac wheels, so this entry only applies to historical installs (see
+[macos.md](macos.md) and
+[#889](https://github.com/debpalash/OmniVoice-Studio/issues/889)).
 
 ## 10. Windows: `Could not locate cudnn_ops_infer64_8.dll` during transcription
 
@@ -191,14 +202,30 @@ WhisperX or faster-whisper selected.
 
 **Cause:** WhisperX and faster-whisper run on **CTranslate2**, which needs
 **cuDNN 8**, but PyTorch 2.8 ships cuDNN 9. OmniVoice side-loads a cuDNN-8 copy
-from `.venv\Lib\site-packages\cudnn8_compat\`; if that folder is missing
-(some upgrade paths don't install it), CTranslate2 can't find the DLL.
+from `.venv\Lib\site-packages\cudnn8_compat\` — but the step that installs that
+folder only ever lived in the dev-loop setup script, which isn't bundled into
+the packaged app. **Packaged installs never had these libraries at all**, so
+reinstalling never fixed it ([#827](https://github.com/debpalash/OmniVoice-Studio/issues/827)).
 
-**Fix:** switch the ASR backend to **PyTorch Whisper** in **Settings → Models**.
-It runs on PyTorch's own stack (cuDNN 9, bundled with torch) and needs no
-cuDNN-8 DLL — it loads its Whisper pipeline on demand (no extra env var). To
-keep using faster-whisper/WhisperX instead, reinstall to restore the bundled
-`cudnn8_compat` libraries.
+**Fix:** update to the latest build and relaunch — the app's bootstrap now
+detects a CUDA machine and installs the cuDNN-8 libraries into the backend venv
+automatically at launch ([#869](https://github.com/debpalash/OmniVoice-Studio/pull/869)).
+(The check is skipped — and its negative result cached — on CPU/AMD/Apple
+machines, so non-NVIDIA launches stay instant.)
+
+If the automatic install can't run (offline / restricted network), install
+manually into the backend venv, then restart:
+
+```
+uv pip install --no-deps --python .venv\Scripts\python.exe --target .venv\Lib\site-packages\cudnn8_compat nvidia-cudnn-cu12==8.9.7.29
+```
+
+(On Linux the target is `.venv/lib/pythonX.Y/site-packages/cudnn8_compat`.)
+
+Or sidestep cuDNN 8 entirely: switch the ASR backend to **PyTorch Whisper** in
+**Settings → Models**. It runs on PyTorch's own stack (cuDNN 9, bundled with
+torch) and needs no cuDNN-8 DLL — it loads its Whisper pipeline on demand (no
+extra env var).
 
 ## 11. IndexTTS / CosyVoice / ChatterboxTTS clash
 
@@ -215,6 +242,15 @@ for the dedicated CosyVoice path.
 
 **Linked issue:** [#55](https://github.com/debpalash/OmniVoice-Studio/issues/55)
 
+**Same class, ASR side:** the `nemo-parakeet` ASR engine has the identical
+problem and currently has **no safe install path** at all — `nemo_toolkit[asr]`
+hard-pins `transformers>=4.57,<4.58`, which is unsatisfiable alongside
+OmniVoice's own `transformers>=5.3` requirement. Installing it into the
+shared venv breaks the backend outright. Do not `pip install nemo_toolkit`
+into OmniVoice's environment; if you want to try it, use a separate Python
+environment. Isolated-venv support for this engine (matching CosyVoice/
+dots-tts) is tracked in [#974](https://github.com/debpalash/OmniVoice-Studio/issues/974).
+
 ## 12. CUDA PyTorch wheel download fails on first run
 
 **Symptom:** first-run setup stops at **Installing dependencies** with a failure
@@ -287,8 +323,10 @@ order:
   files are a common false-positive quarantine), then re-enable.
 - **Connection** — use a stable, direct connection; pause any VPN; avoid
   corporate/school networks.
-- **Region mirror** — if `huggingface.co` is slow/blocked where you are, set a
-  mirror **before** launching and relaunch:
+- **Region mirror** — if `huggingface.co` is slow/blocked where you are, pick a
+  mirror in-app (**Settings → Models → Hugging Face mirror**, or the quick-pick
+  the first-run system check offers when the endpoint is unreachable), or set
+  it as an env var before launching and relaunch:
   - macOS/Linux: `export HF_ENDPOINT=https://hf-mirror.com`
   - Windows (PowerShell): `[Environment]::SetEnvironmentVariable("HF_ENDPOINT","https://hf-mirror.com","User")`
 
@@ -344,14 +382,68 @@ did was `generate:start (audio)`, a dub, or a dictation.
 4. **Test with a 10-second clip** first — if that returns quickly, it confirms a
    compute/VRAM limit rather than a true hang.
 
-Newer builds **bound** every GPU job — whole-file transcription **and** TTS
-generation: instead of hanging forever and starving the backend, a wedged job now
-fails after a timeout with this exact guidance, and the worker pool is reset so
-capacity is restored automatically (no app restart needed). Tune the bounds with
-`OMNIVOICE_ASR_TRANSCRIBE_TIMEOUT_S` (transcription) and
-`OMNIVOICE_GENERATE_TIMEOUT_S` (generation) — both in seconds, default 300.
-**Raise** them for very long single files/generations, **lower** them to fail
-faster on a small machine.
+Newer builds **bound** every GPU job — whole-file transcription, **chunked dub
+transcription**, **and** TTS generation: instead of hanging forever and starving
+the backend, a wedged job now fails after a timeout with this exact guidance,
+and the worker pool is reset so capacity is restored automatically (no app
+restart needed). Tune the bounds with `OMNIVOICE_ASR_TRANSCRIBE_TIMEOUT_S`
+(whole-file transcription) and `OMNIVOICE_GENERATE_TIMEOUT_S` (generation) —
+both in seconds, default 300 — and `OMNIVOICE_TRANSCRIBE_CHUNK_TIMEOUT_S`
+(per-chunk dub transcription, default 120). **Raise** them for very long single
+files/generations, **lower** them to fail faster on a small machine.
+
+**If transcribe timeouts keep repeating back-to-back**, pool resets aren't
+recovering the underlying hang — the wedged thread keeps its VRAM until the app
+exits. The error message will then recommend switching the ASR engine to
+**Faster-Whisper (crash-isolated subprocess)** (`faster-whisper-isolated`) in
+**Settings → Engines**: it runs transcription in a separate process that can be
+force-killed to reclaim a hung transcribe *and* its VRAM, at a small per-call
+overhead. It reuses your existing faster-whisper install (nothing extra to
+download). OmniVoice never switches engines automatically — this stays your
+call.
+
+> **Seeing "The backend crashed (exit code …)" instead?** That's the other
+> failure mode: the backend **process died** (native CUDA abort, out-of-memory
+> kill, DLL crash) rather than hanging. Newer desktop builds detect the death,
+> restart the backend automatically (giving up after 3 crashes in 10 minutes),
+> and show a crash notice with a **View crash details** button (exit code +
+> the last error output). Use **Report this bug** from that notice — the crash
+> evidence is attached to the prefilled GitHub issue automatically, with home
+> paths scrubbed. The raw markers live next to the backend logs in
+> `backend_crash_markers.json`.
+
+## 15. Stuck at "preparing" forever after a crash / BSOD (Windows)
+
+**Symptom:** after an unclean shutdown (Windows BSOD, forced power-off), every
+launch sits on the "preparing" splash indefinitely — even though the backend is
+actually healthy (its log shows models loaded, and
+`http://127.0.0.1:3900/health` answers `{"status":"ok"}` in a browser). The
+WebView log contains:
+
+```
+IPC custom protocol failed, Tauri will now use the postMessage interface instead
+TypeError: Failed to fetch
+```
+
+**Cause:** the crash corrupted the WebView2 profile cache at
+`%LOCALAPPDATA%\com.debpalash.omnivoice-studio\EBWebView`. Both the IPC custom
+protocol *and* its postMessage fallback break, so the splash never hears the
+"ready" signal from the app shell (issue #879).
+
+**Fix:** current builds handle this automatically — if the splash gets no IPC
+signal within ~10 s it checks the backend over plain HTTP and proceeds on its
+own; if the backend isn't up either, after ~45 s a recovery panel appears with
+**Repair and restart** (Windows), which clears the WebView cache and relaunches.
+Your voices, projects, and settings are not touched — only browser display data
+is cleared.
+
+On older builds (≤ 0.3.8), or if the automatic repair fails, do it manually:
+quit OmniVoice Studio, delete the folder below, then start the app again.
+
+<!-- validate: skip -->
+```powershell
+Remove-Item -Recurse -Force "$env:LOCALAPPDATA\com.debpalash.omnivoice-studio\EBWebView"
+```
 
 ## Dub: "translation engine needs the optional … package"
 

docs/install/windows.md

@@ -5,7 +5,24 @@ working OmniVoice Studio install on Windows 10 / 11 (x64).
 
 ## Prerequisites
 
+### Using the MSI installer
+
 - **Windows 10 (21H2 or newer) or Windows 11**, x64.
+- **~10 GB free disk** for the app, its Python environment, and model weights.
+- Optional: an **NVIDIA GPU + driver** for CUDA acceleration — see
+  [GPU support on Windows](#gpu-support). AMD GPUs run CPU-only on Windows.
+
+That's it — Python, FFmpeg, and the model weights are bundled or bootstrapped
+by the app itself on first launch. No toolchain needed.
+
+### Building from source
+
+Everything above, plus the toolchain:
+
+- **Git for Windows** — `winget install --id Git.Git -e`. Needed for
+  `git clone`, and it includes **Git Bash**, which `bun run desktop-prod`
+  uses to run its build-and-launch script. Without it, `desktop-prod` stops
+  with an error telling you to install it.
 - **Python 3.11+** — `winget install Python.Python.3.11` (or download from
   [python.org](https://www.python.org/downloads/windows/)).
 - **Microsoft C++ Build Tools** — required by some PyPI source distributions
@@ -14,13 +31,24 @@ working OmniVoice Studio install on Windows 10 / 11 (x64).
   with the **"Desktop development with C++"** workload checked.
 - **Bun** — `powershell -c "irm bun.sh/install.ps1 | iex"`.
 - **FFmpeg** — `winget install Gyan.FFmpeg`.
-- **Git for Windows** (from-source installs only) — `winget install --id Git.Git -e`.
-  You need it for `git clone` anyway, and it includes **Git Bash**, which
-  `bun run desktop-prod` uses to run its build-and-launch script. Without it,
-  `desktop-prod` stops with an error telling you to install it.
-- **Rust / Cargo** (required for building from source only) — `winget install Rust.Rustup` or download `rustup-init.exe` from [rustup.rs](https://rustup.rs/).
+- **Rust / Cargo** — `winget install Rust.Rustup` or download `rustup-init.exe` from [rustup.rs](https://rustup.rs/).
   After installing Rustup, close and reopen PowerShell before running `bun run desktop-prod`.
 
+## GPU support on Windows
+
+<a id="gpu-support"></a>
+
+**GPU acceleration on Windows is NVIDIA/CUDA-only.** The Windows install
+ships the CUDA build of PyTorch; with an NVIDIA GPU and a regular NVIDIA
+driver it's picked up automatically (no CUDA Toolkit install needed).
+
+**AMD GPUs — including Ryzen / Ryzen AI integrated Radeon graphics — run
+CPU-only on Windows.** ROCm is not supported on Windows: PyTorch publishes no
+Windows ROCm wheels, and OmniVoice's ROCm option is Linux-only. (The Ryzen AI
+NPU is likewise not used.) Everything still works on CPU, just slower. If you
+have an AMD GPU and want GPU acceleration, run OmniVoice on Linux instead —
+see [linux.md — AMD GPU (ROCm)](linux.md#amd-gpu-rocm).
+
 ## Install (from source)
 
 Run from a regular (non-admin) PowerShell:
@@ -49,6 +77,47 @@ Download the latest MSI from the
 run it, follow the wizard. The shortcut lands in the Start menu as
 **OmniVoice Studio**.
 
+## Portable install (Windows)
+
+<a id="portable-install"></a>
+
+OmniVoice Studio has a **Portable** mode: instead of scattering data across
+`%APPDATA%` and `%LOCALAPPDATA%`, the whole install — Python env, model
+weights, voices, projects, settings — lives in a single
+`OmniVoiceStudio-Data` folder created **next to the executable**. Moving or
+copying the app folder (exe + that data folder together) relocates the entire
+install, USB-stick style.
+
+The first-run setup screen offers Portable whenever the folder next to
+`OmniVoice Studio.exe` is writable. A default MSI install goes to
+`C:\Program Files`, which is *not* user-writable — that's why Portable shows
+as greyed out after a default install
+([#766](https://github.com/debpalash/OmniVoice-Studio/issues/766)). To enable
+it, install to a user-writable folder instead:
+
+- Re-run the MSI and choose a custom destination folder in the setup wizard
+  (e.g. `D:\Apps\OmniVoice`), or
+- From a terminal:
+  `msiexec /i OmniVoice.Studio_<version>_x64_en-US.msi INSTALLDIR="D:\Apps\OmniVoice"`
+
+On the next launch, pick **Portable** on the first-run setup screen. What
+lives next to the exe afterwards:
+
+<!-- validate: skip -->
+```
+D:\Apps\OmniVoice\
+├── OmniVoice Studio.exe        ← the app
+└── OmniVoiceStudio-Data\       ← the whole install, self-contained
+    ├── config.json             ← install-mode + app settings
+    ├── env\                    ← Python venv + backend code
+    └── data\                   ← voices, projects, settings DB
+        └── models\             ← model weights (HF cache)
+```
+
+Prefer the default Program Files install? **Installed** mode is the same app —
+data just lives in `%APPDATA%\OmniVoice` and the model cache in
+`%LOCALAPPDATA%\OmniVoice\hf_cache`.
+
 ## HF_TOKEN persistence
 
 The **recommended path** is the in-app **Settings → API Keys** panel: it

docs/playbooks/oss-sponsorship-setup.md

@@ -0,0 +1,164 @@
+# Playbook — Setting up sponsorship for an open-source project
+
+> A portable, copy-to-another-repo guide for adding a tasteful sponsorship
+> system to a free/local-first OSS project. This is the exact setup shipped
+> in OmniVoice Studio (PRs #923 + #924); lift the files, swap the names, and
+> you have the same system in an afternoon.
+
+## Philosophy (decide this first — it shapes everything)
+
+1. **Sponsorship is a thank-you, not a paywall.** The software stays fully
+   free and the same license. Tiers buy *visibility and gratitude*
+   (logo placement), never gated features. Say this out loud in `SPONSORS.md`
+   — it's what keeps the community's trust and separates you from a freemium
+   bait-and-switch.
+2. **Tell the honest funding story.** People sponsor a *reason*, not a tip
+   jar. OmniVoice's is "one developer, in the open, and the AI-agent bills
+   are real." Whatever yours is (server costs, your time, signing certs),
+   state it plainly and specifically. Vague "support us" underperforms a
+   concrete "here's what the money pays for."
+3. **Local-first / no-infra.** No sponsor-management SaaS, no token held by
+   the app, no third-party embed. The contact flow is a prefilled GitHub
+   issue the user submits from their own browser — the same zero-credential
+   pattern good OSS bug-reporters use. It survives forks (change one URL).
+4. **Ask at value moments, rarely.** (This is the *prompting* half — see the
+   donation-moments system, a separate piece: after a successful export,
+   ≥N lifetime successes, long cooldown, permanent opt-out. Never nag.)
+
+The two failure modes to avoid: **core-js** (console-spam nagging → community
+backlash) and **blocking modals**. The two that work: **value-moment timing**
++ **enforced rarity** with an instant, respected exit.
+
+## The pieces (what to create)
+
+A complete system is six files. Placements form a natural ladder — each tier
+adds one more surface:
+
+```
+SPONSORS.md                          ← the home: why, tiers, how-to, roster, asset rules
+README.md  (## Sponsors subsection)  ← logo slots + "your logo here" + link to SPONSORS.md
+.github/FUNDING.yml                  ← GitHub's native "Sponsor" button (Ko-fi / custom links)
+.github/ISSUE_TEMPLATE/sponsor.yml   ← the "Sponsorship inquiry" issue FORM (structured fields)
+frontend/.../config/sponsors.js      ← in-app single source of truth (empty array + contact URLs)
+frontend/.../SupportPage + footer    ← in-app logo grid, "Become a sponsor" CTA, footer link
+```
+
+### 1. `SPONSORS.md` — the home
+
+Sections, in order: **Why sponsor** (the honest funding story + "where your
+money goes"), **Tiers** (a table — placements as benefits, cumulative),
+**How to become a sponsor**, **Logo/asset guidelines**, **Current sponsors**
+(a "be the first" placeholder with empty tier tables ready to fill), and a
+**Not a paywall** note.
+
+Tier ladder that maps to real surfaces:
+
+| Tier | Placement added |
+|------|-----------------|
+| Backer | name/handle in `SPONSORS.md` |
+| Bronze | + small logo in `SPONSORS.md` and the README Sponsors section |
+| Silver | + logo in the README and the in-app Sponsors page |
+| Gold | + prominent logo slot on the project website/landing |
+
+**Leave prices as owner-input placeholders.** Use an HTML-comment marker so
+they're obvious in source and never accidentally invented by an automated
+edit: `_set by owner_ <!-- OWNER: set amounts -->`. Same for a public contact
+email — don't publish a personal address without the owner's explicit call;
+default the contact to the GitHub issue form.
+
+### 2. README `## Sponsors` subsection
+
+A short pitch, a logo-slot placeholder (`**Your logo here** — [become a
+sponsor](SPONSORS.md)`), and a link to `SPONSORS.md`. Wrap the logo area in
+`<!-- SPONSORS:START -->` / `<!-- SPONSORS:END -->` markers so a future script
+can auto-render logos from the config. Add a `Sponsors` entry to the top nav.
+
+### 3. `.github/FUNDING.yml`
+
+Turns on GitHub's native "Sponsor" button. Only list platforms you're
+actually on — don't add `github: [you]` unless GitHub Sponsors is set up.
+Ko-fi + a `custom:` list (PayPal, the SPONSORS.md link) is a fine start:
+
+```yaml
+ko_fi: yourhandle
+custom:
+  - "https://paypal.me/you"
+  - "https://github.com/you/repo/blob/main/SPONSORS.md"
+```
+
+### 4. `.github/ISSUE_TEMPLATE/sponsor.yml` — the inquiry form
+
+A structured issue **form** (name/org, website, logo URL, tier interest,
+contact, acknowledgements), `labels: ["sponsor"]`. **Gotcha we hit:** if
+`config.yml` has `blank_issues_enabled: false`, a bare
+`issues/new?title=…&body=…` prefill redirects to the template chooser and
+*drops the body*. So point "Become a sponsor" at the **template route**
+instead: `issues/new?template=sponsor.yml`. That carries the form's fields
+reliably.
+
+### 5. In-app config — single source of truth
+
+One module the whole app reads (`config/sponsors.js` in our case):
+
+```js
+export const SPONSORS = [];          // { name, logoUrl, url, tier } — empty until you have sponsors
+export const SPONSOR_TIERS = ['platinum', 'gold', 'silver', 'bronze'];  // display order
+export const SPONSOR_CONTACT = {
+  githubIssue: `${REPO}/issues/new?template=sponsor.yml`,  // the template route (see gotcha)
+  kofi: KOFI_URL,
+  docsUrl: `${REPO}/blob/main/SPONSORS.md`,
+};
+```
+
+Adding a sponsor = one PR touching this array **and** `SPONSORS.md` (keep them
+in lockstep; a test can assert they match).
+
+### 6. In-app surface — Support page section + footer link
+
+- A **Sponsors section** on the Support/About page: a logo grid grouped by
+  tier that renders from `SPONSORS`, with a **tasteful empty state** ("Be the
+  first to sponsor — your logo here" + an outlined slot) while the array is
+  empty, a **"Become a sponsor"** button opening `SPONSOR_CONTACT.githubIssue`
+  via the app's external-open helper (Tauri-safe), and a one-line explainer of
+  what sponsors get, linking to `SPONSORS.md`.
+- A **compact footer link/icon** that opens that section. Keep it small and
+  uniform with the other footer icons.
+- Logos: lazy-loaded, max-height capped, `aria-label`ed, `rel="noreferrer"`.
+
+## How to replicate on another project (checklist)
+
+1. Copy `SPONSORS.md`, `.github/FUNDING.yml`, `.github/ISSUE_TEMPLATE/sponsor.yml`.
+   Find-and-replace the repo slug, handle, and funding URLs. Write your own
+   honest funding story + "where your money goes".
+2. Add the README `## Sponsors` subsection with the `SPONSORS:START/END`
+   markers and a nav entry.
+3. If the project has an app UI: add the `sponsors.js` config (empty array),
+   a Sponsors section on your support/about screen, and a footer link. Wire
+   the CTA to the issue-template route. If it's a library/CLI with no UI,
+   skip this — the docs + FUNDING.yml carry it.
+4. Leave prices and any public contact as `<!-- OWNER: … -->` placeholders for
+   the maintainer to fill. Don't invent amounts or publish a personal email.
+5. (Optional, recommended) Add the **value-moment donation prompt** — a
+   throttled, opt-out-able "support us" nudge shown only after a real success,
+   never more than rarely. That's a separate component; see the donation-
+   moments implementation.
+6. Add a test that `sponsors.js` and `SPONSORS.md` list the same sponsors, so
+   they can't drift.
+
+## What NOT to do
+
+- ❌ A sponsor-management SaaS or a third-party embed (breaks local-first,
+  adds a dependency, holds credentials).
+- ❌ Bare `issues/new?body=…` prefill when blank issues are disabled (body is
+  dropped — use `?template=`).
+- ❌ Inventing tier prices or publishing a personal contact email in an
+  automated edit — leave `OWNER:` markers.
+- ❌ Gating features behind tiers, or nagging. The software stays free; the
+  ask stays a rare, respected thank-you moment.
+
+---
+
+*Provenance: this is the system shipped in OmniVoice Studio — `SPONSORS.md`,
+the README Sponsors section, `.github/FUNDING.yml`, `.github/ISSUE_TEMPLATE/
+sponsor.yml`, `frontend/src/config/sponsors.js`, the Support-page Sponsors
+section, and the footer link. Copy them and adapt.*

docs/specs/longform/28-two-pass-acx-mastering.md

@@ -6,7 +6,7 @@ Today the longform renderer (Audiobook + Stories) applies a **single-pass** `lou
 
 Upgrade to **two-pass** `loudnorm`: a first **measure** pass (`print_format=json`, output to `-f null -`) parses the clip's `input_i / input_tp / input_lra / input_thresh / target_offset`, then a second **apply** pass feeds those measured values back as `measured_*` + `offset` + `linear=true`. This lands the output accurately on the preset target. The change is a **runner enhancement** layered over the existing pure builders — the pure `build_loudnorm_filter()` and `LOUDNESS_PRESETS` stay; we add a measure-filter builder, a measured-apply-filter builder, a JSON parser, a measure-cmd argv builder, and an async two-pass orchestrator that runs in `_render_longform_sse` (`backend/api/routers/audiobook.py:345`) between the chapter renders and the final mux. Loudness stays **opt-in** (`loudness: None` default on both `AudiobookRequest` `:151` and `LongformRenderRequest` `:510`), so default cross-platform behavior is unchanged.
 
-> **Naming note (grounded):** "mastering" already exists in this codebase as `services.audio_dsp.apply_mastering()` (`backend/services/audio_dsp.py:101`) — a per-clip pedalboard EQ/Compressor/Reverb chain used by `/generate`, `/dub`, batch, and stream paths. That is a **different** operation and **is not called** in the longform path (`_render_longform_sse` muxes chapter WAVs straight from `synthesize_chapter`, no `apply_mastering`). The two-pass loudnorm here is the *only* loudness operation in the longform renderer. To avoid conflating the two, the new SSE event is named `"mastering"` deliberately as the user-facing loudness step for longform; this is harmless because the longform stream never emits anything else by that name, but reviewers should know the term is overloaded across the repo.
+> **Naming note (grounded):** "mastering" already exists in this codebase as `services.audio_dsp.apply_mastering()` (`backend/services/audio_dsp.py:101`) — a per-clip pedalboard highpass/Compressor chain used by `/generate`, `/dub`, batch, and stream paths. That is a **different** operation and **is not called** in the longform path (`_render_longform_sse` muxes chapter WAVs straight from `synthesize_chapter`, no `apply_mastering`). The two-pass loudnorm here is the *only* loudness operation in the longform renderer. To avoid conflating the two, the new SSE event is named `"mastering"` deliberately as the user-facing loudness step for longform; this is harmless because the longform stream never emits anything else by that name, but reviewers should know the term is overloaded across the repo.
 
 ## Problem
 

docs/update-channels.md

@@ -1,8 +1,8 @@
 # Update channels (Stable / Preview)
 
 OmniVoice Studio auto-updates itself in the background. You choose **which
-builds** it offers you with the update channel in **Settings → About → Update
-channel**.
+builds** it offers you with the update channel in **Settings → Updates →
+Update channel**.
 
 | Channel | What you get | Who it's for |
 |---------|--------------|--------------|
@@ -25,6 +25,33 @@ manifest:
 Both manifests are signed with the same minisign key, so a tampered build is
 rejected regardless of channel.
 
+## Your data during updates
+
+Your voices, projects, history, and settings live in a SQLite database
+(`omnivoice.db`) outside the app bundle, so replacing the app never touches
+them. On the **first launch of an updated build**, if the new version needs a
+database schema upgrade, OmniVoice:
+
+1. **Backs up the database first** — a consistent snapshot is written next to
+   it as `omnivoice.db.backup-<version>-<n>` before any migration runs. The
+   newest **3** backups are kept; older ones are pruned automatically.
+   (Databases over 500 MB skip the snapshot, with a log line saying so.)
+2. **Stops instead of guessing** — if a migration fails midway, the app does
+   *not* start on a half-migrated database and does *not* silently restore
+   anything. It shows an error naming the backup path so you (or a support
+   thread) decide: retry, report the issue, or roll back by replacing
+   `omnivoice.db` with the backup.
+
+**Settings → Updates** shows the timestamp of the latest backup, the release
+notes of any available update, and a **What's new** reader for the shipped
+changelog — all local, no extra network calls.
+
+The Python environment (`.venv`) is also updated non-destructively: dependency
+drift after an app update is reconciled **in place** with `uv sync`, and a
+failed sync keeps the previous environment working. The venv is only ever
+rebuilt when its interpreter is *confirmed* broken (structural check + a
+direct probe) or when you explicitly use **Clean & Retry**.
+
 ## For maintainers — how previews are built
 
 Preview builds come from **`main`**, two ways:

frontend/e2e/footer-clipping.spec.ts

@@ -0,0 +1,63 @@
+import { test, expect } from '@playwright/test';
+import { gotoMode } from './_helpers';
+
+/**
+ * Footer-clipping guard — "buttons hidden under the footer on small windows"
+ * (owner report 2026-07-02; same class as #476/#504).
+ *
+ * The LogsFooter is a grid row of .app-container (see index.css), so page
+ * content must physically end at the footer's top edge — no card, button, or
+ * action bar may render underneath it. Verified at the app's minimum window
+ * size (tauri.conf.json minWidth 900 × minHeight 600), where the old fixed
+ * overlay + padding reservation clipped the bottom card row.
+ */
+
+const MIN_WINDOW = { width: 900, height: 600 };
+
+async function footerTop(page): Promise<number> {
+  const footer = page.locator('.app-container .logs-footer');
+  await expect(footer).toBeVisible();
+  const box = await footer.boundingBox();
+  expect(box).not.toBeNull();
+  return box!.y;
+}
+
+test.describe('LogsFooter never covers page content @ 900x600', () => {
+  test.use({ viewport: MIN_WINDOW });
+
+  test('gallery: bottom-most voice card stays above the collapsed footer', async ({ page }) => {
+    await gotoMode(page, 'gallery');
+    const cards = page.locator('.archetype-card');
+    await expect(cards.first()).toBeVisible({ timeout: 20_000 });
+
+    const top = await footerTop(page);
+    // Scroll the last card into view — with the footer in the grid flow the
+    // scroll container ends at the footer's top, so the card must fit fully
+    // above it once scrolled.
+    const last = cards.last();
+    await last.scrollIntoViewIfNeeded();
+    const box = await last.boundingBox();
+    expect(box).not.toBeNull();
+    expect(box!.y + box!.height).toBeLessThanOrEqual(top + 1); // 1px AA tolerance
+  });
+
+  test('expanded footer still cannot cover content — scroll container shrinks instead', async ({
+    page,
+  }) => {
+    await gotoMode(page, 'gallery');
+    const cards = page.locator('.archetype-card');
+    await expect(cards.first()).toBeVisible({ timeout: 20_000 });
+
+    // Expand the logs panel (chevron toggle in the collapsed bar).
+    const toggle = page.locator('.logs-footer [title], .logs-footer button').first();
+    await toggle.click();
+    await expect(page.locator('.logs-footer--open')).toBeVisible();
+
+    const top = await footerTop(page);
+    const last = cards.last();
+    await last.scrollIntoViewIfNeeded();
+    const box = await last.boundingBox();
+    expect(box).not.toBeNull();
+    expect(box!.y + box!.height).toBeLessThanOrEqual(top + 1);
+  });
+});

frontend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "omnivoice-studio",
-  "version": "0.3.8",
+  "version": "0.3.12",
   "private": true,
   "license": "AGPL-3.0-only",
   "type": "module",
@@ -39,6 +39,7 @@
     "@radix-ui/react-toggle": "^1.1.12",
     "@radix-ui/react-toggle-group": "^1.1.13",
     "@radix-ui/react-tooltip": "^1.2.10",
+    "@scalar/api-reference-react": "^0.9.52",
     "@tailwindcss/vite": "^4.3.1",
     "@tanstack/react-query": "^5.101.0",
     "@tanstack/react-table": "^8.21.3",

frontend/src-tauri/Cargo.lock

@@ -2941,7 +2941,7 @@ dependencies = [
 
 [[package]]
 name = "omnivoice-studio"
-version = "0.3.8"
+version = "0.3.12"
 dependencies = [
  "arboard",
  "dirs-next",
@@ -2969,6 +2969,7 @@ dependencies = [
  "walkdir",
  "webkit2gtk",
  "webview2-com",
+ "windows 0.61.3",
  "windows-core 0.61.2",
  "zip 2.4.2",
 ]

frontend/src-tauri/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "omnivoice-studio"
-version = "0.3.8"
+version = "0.3.12"
 description = "OmniVoice Studio – AI voice cloning & dubbing desktop app"
 authors = ["Debpalash"]
 license = "AGPL-3.0-only"
@@ -71,6 +71,13 @@ zip = { version = "2", default-features = false, features = ["deflate"] }
 # Versions match what wry already locks — no new native code is pulled in.
 webview2-com = "0.38"
 windows-core = "0.61"
+# Raw HWND access (GetWindowLongPtrW/SetWindowLongPtrW/ShowWindow) to mark the
+# dictation pill WS_EX_NOACTIVATE so showing it doesn't steal Win32 foreground
+# activation (#982 — Windows counterpart of #287's macOS focus-steal fix).
+# Version pinned to match what `tauri` itself already resolves to (0.61.x) so
+# `WebviewWindow::hwnd()`'s return type and our syscalls share the exact same
+# `HWND` type — no second copy of the crate enters the dependency graph.
+windows = { version = "0.61", features = ["Win32_Foundation", "Win32_UI_WindowsAndMessaging"] }
 
 [target.'cfg(unix)'.dependencies]
 libc = "0.2"

frontend/src-tauri/src/backend.rs

@@ -34,11 +34,55 @@ pub fn port_in_use(port: u16) -> bool {
 pub fn backend_healthy(port: u16) -> bool {
     let url = format!("http://127.0.0.1:{}/system/info", port);
     match ureq_get_with_timeout(&url, Duration::from_millis(500)) {
-        Ok(body) => body.contains("\"model_checkpoint\"") || body.contains("\"data_dir\""),
+        Ok(body) => is_omnivoice_body(&body),
         Err(_) => false,
     }
 }
 
+fn is_omnivoice_body(body: &str) -> bool {
+    body.contains("\"model_checkpoint\"") || body.contains("\"data_dir\"")
+}
+
+/// The `app_version` reported by the OmniVoice backend at :port.
+/// `None` when nothing OmniVoice answers there (port free, or a foreign
+/// process). `Some("")` when it IS our backend but predates the
+/// `app_version` field — callers treat that as stale.
+pub fn running_backend_version(port: u16) -> Option<String> {
+    let url = format!("http://127.0.0.1:{}/system/info", port);
+    let body = ureq_get_with_timeout(&url, Duration::from_millis(500)).ok()?;
+    if !is_omnivoice_body(&body) {
+        return None;
+    }
+    Some(parse_app_version(&body).unwrap_or_default())
+}
+
+/// Extract `"app_version": "X"` from a /system/info body. String-sniff on one
+/// field (consistent with `backend_healthy`) — no JSON dependency needed.
+fn parse_app_version(body: &str) -> Option<String> {
+    let key = "\"app_version\"";
+    let rest = &body[body.find(key)? + key.len()..];
+    let rest = rest[rest.find(':')? + 1..].trim_start();
+    let rest = rest.strip_prefix('"')?;
+    Some(rest[..rest.find('"')?].to_string())
+}
+
+/// Whether a running backend's version matches THIS app build, comparing
+/// **base** versions (any `-N` pre-release suffix stripped from both sides) so
+/// a preview build `0.3.10-4` still attaches to its `0.3.10` backend.
+///
+/// Why this exists (the "bound port blocked the newer version" report): an
+/// orphaned backend from a *previous* version keeps answering health checks
+/// after an update, so "healthy" alone made the new UI silently attach to old
+/// backend code — every fix in the update appeared to change nothing. A
+/// version-mismatched (or unversioned) OmniVoice responder is stale by
+/// definition; callers kill it and spawn the bundled backend instead.
+pub fn same_app_version(running: &str) -> bool {
+    fn base(v: &str) -> &str {
+        v.split('-').next().unwrap_or(v).trim()
+    }
+    !running.is_empty() && base(running) == base(env!("CARGO_PKG_VERSION"))
+}
+
 fn ureq_get_with_timeout(url: &str, timeout: Duration) -> Result<String, String> {
     let url = url.strip_prefix("http://").ok_or("only http:// supported")?;
     let (host_port, path) = match url.find('/') {
@@ -365,4 +409,34 @@ mod tests {
         assert!(diag.contains("Interpreter present on disk: false"));
         assert!(diag.contains("Clean & Retry"), "must give an actionable hint");
     }
+
+    // ── stale-backend detection (the "bound port blocked the newer version"
+    //    report: a healthy orphan from a previous version must NOT be
+    //    attached to) ─────────────────────────────────────────────────────
+
+    #[test]
+    fn parse_app_version_reads_system_info_shape() {
+        let body = r#"{"app_version":"0.3.9","data_dir":"/x","model_checkpoint":"k2"}"#;
+        assert_eq!(parse_app_version(body).as_deref(), Some("0.3.9"));
+        // whitespace after the colon is fine
+        assert_eq!(
+            parse_app_version(r#"{ "app_version" :  "1.2.3" }"#).as_deref(),
+            Some("1.2.3")
+        );
+        // pre-app_version backends and foreign bodies yield None
+        assert_eq!(parse_app_version(r#"{"data_dir":"/x"}"#), None);
+        assert_eq!(parse_app_version("<html>not json</html>"), None);
+    }
+
+    #[test]
+    fn same_app_version_matches_current_build_and_rejects_stale() {
+        let ours = env!("CARGO_PKG_VERSION");
+        assert!(same_app_version(ours), "own version must attach");
+        // preview stamp of the same base still attaches
+        assert!(same_app_version(&format!("{}-7", ours)));
+        // a different (older) release is stale
+        assert!(!same_app_version("0.0.1"));
+        // unversioned (pre-app_version backend) is stale by definition
+        assert!(!same_app_version(""));
+    }
 }

frontend/src-tauri/src/bootstrap.rs

@@ -12,6 +12,7 @@ use serde::Serialize;
 use tauri::{Emitter, Manager};
 
 use crate::config::get_effective_region;
+use crate::crash::BackendExit;
 use crate::tools::resolve_uv;
 use crate::{AppFlags, BackendState, backend_port};
 
@@ -145,13 +146,34 @@ pub fn retry_bootstrap(app: tauri::AppHandle, state: tauri::State<'_, BootstrapS
             set_stage(&stage_handle, BootstrapStage::Ready);
             return;
         }
-        if crate::backend::backend_healthy(backend_port()) {
-            log::info!("Port {} already serving OmniVoice backend — attaching", backend_port());
-            set_stage(&stage_handle, BootstrapStage::Ready);
-            return;
+        match crate::backend::running_backend_version(backend_port()) {
+            Some(v) if crate::backend::same_app_version(&v) => {
+                log::info!(
+                    "Port {} already serving OmniVoice backend v{} — attaching",
+                    backend_port(), v
+                );
+                set_stage(&stage_handle, BootstrapStage::Ready);
+                return;
+            }
+            Some(v) => {
+                // A healthy-but-stale backend from a previous version (the
+                // classic post-update orphan). Attaching would silently run
+                // OLD backend code under the new UI — replace it instead.
+                log::warn!(
+                    "Port {} serves a stale OmniVoice backend (v{} != app v{}) — replacing it",
+                    backend_port(),
+                    if v.is_empty() { "<unknown>" } else { v.as_str() },
+                    env!("CARGO_PKG_VERSION"),
+                );
+                set_backend_kill_intended(true); // deliberate kill, not a crash (#941)
+                crate::backend::kill_orphan_on_port(backend_port());
+                std::thread::sleep(Duration::from_millis(500));
+            }
+            None => {}
         }
         if crate::backend::port_in_use(backend_port()) {
             log::warn!("Port {} in use — taking ownership", backend_port());
+            set_backend_kill_intended(true); // deliberate kill, not a crash (#941)
             crate::backend::kill_orphan_on_port(backend_port());
             std::thread::sleep(Duration::from_millis(500));
         }
@@ -173,9 +195,7 @@ pub fn spawn_backend_and_wait(app: &tauri::AppHandle, stage_handle: &Arc<Mutex<B
     let mut venv_heal_attempted = false;
     'bootstrap: loop {
         let child = crate::backend::spawn_backend(app, Some(stage_handle));
-        if let Ok(mut guard) = app.state::<BackendState>().process.lock() {
-            *guard = child;
-        }
+        track_backend_child(app, child);
         let start = std::time::Instant::now();
         while start.elapsed() < Duration::from_secs(300) {
             if crate::backend::backend_healthy(backend_port()) {
@@ -194,20 +214,41 @@ pub fn spawn_backend_and_wait(app: &tauri::AppHandle, stage_handle: &Arc<Mutex<B
                 }
                 return;
             }
-            let process_dead = if let Ok(mut guard) = app.state::<BackendState>().process.lock() {
-                match guard.as_mut() {
-                    Some(child) => match child.try_wait() {
-                        Ok(Some(status)) => Some(status.to_string()),
-                        Ok(None) => None,
-                        Err(_) => Some("unknown".to_string()),
-                    },
-                    None => Some("never started".to_string()),
-                }
-            } else {
-                None
-            };
-            if let Some(exit_info) = process_dead {
+            let process_dead: Option<(String, Option<BackendExit>)> =
+                if let Ok(mut guard) = app.state::<BackendState>().process.lock() {
+                    match guard.as_mut() {
+                        Some(child) => match child.try_wait() {
+                            Ok(Some(status)) => {
+                                let exit = BackendExit::from_status(status);
+                                Some((exit.description.clone(), Some(exit)))
+                            }
+                            Ok(None) => None,
+                            // try_wait errored — the death is real but its
+                            // shape is unknown; no exit code for the marker.
+                            Err(_) => Some(("unknown".to_string(), None)),
+                        },
+                        // Spawn itself failed — no process ever ran, so this
+                        // is a spawn failure (spawn_failure_diagnostic owns
+                        // it), NOT a crash: no marker.
+                        None => Some(("never started".to_string(), None)),
+                    }
+                } else {
+                    None
+                };
+            if let Some((exit_info, real_exit)) = process_dead {
                 let err_tail = crate::backend::read_error_log_tail(30);
+                // #941: persist the forensics for every true process death —
+                // startup crashes included — unless the app is shutting down
+                // or a retry flow deliberately killed the child.
+                if let Some(ref exit) = real_exit {
+                    if !app_is_quitting(app) && !backend_kill_intended() {
+                        crate::crash::record_crash(crate::crash::marker_now(
+                            exit,
+                            backend_uptime_s(app),
+                            crate::backend::read_error_log_tail(CRASH_STDERR_TAIL_LINES),
+                        ));
+                    }
+                }
                 // #314: a backend that dies because the venv itself is broken
                 // can only be healed by rebuilding the venv — do that once
                 // instead of failing into an unwinnable retry loop.
@@ -216,24 +257,40 @@ pub fn spawn_backend_and_wait(app: &tauri::AppHandle, stage_handle: &Arc<Mutex<B
                 {
                     venv_heal_attempted = true;
                     let venv_dir = crate::setup::env_root(app).join("project").join(".venv");
-                    log::warn!(
-                        "Backend exited with a broken-venv signature ({}) — removing {} and rebuilding (#314)",
-                        exit_info,
-                        venv_dir.display()
-                    );
-                    emit_log(
-                        app,
-                        "checking",
-                        "Backend failed because the Python environment is broken — rebuilding it automatically",
-                    );
-                    if quarantine_broken_venv(&venv_dir) {
-                        set_stage(stage_handle, BootstrapStage::Checking);
-                        continue 'bootstrap;
+                    // Data-safe guard (feat/safe-updates): the signature above
+                    // is text matching — confirm the venv is actually broken
+                    // (structural check + direct interpreter probe) before
+                    // destroying it. A healthy venv is never deleted.
+                    let structural = venv_structural_problem(&venv_dir);
+                    let probe = venv_interpreter_probe(&venv_python_path(&venv_dir));
+                    if venv_rebuild_justified(structural.as_deref(), probe) {
+                        log::warn!(
+                            "Backend exited with a broken-venv signature ({}; structural={:?}, probe={:?}) — removing {} and rebuilding (#314)",
+                            exit_info,
+                            structural,
+                            probe,
+                            venv_dir.display()
+                        );
+                        emit_log(
+                            app,
+                            "checking",
+                            "Backend failed because the Python environment is broken — rebuilding it automatically",
+                        );
+                        if quarantine_broken_venv(&venv_dir) {
+                            set_stage(stage_handle, BootstrapStage::Checking);
+                            continue 'bootstrap;
+                        }
+                        log::error!(
+                            "Could not remove broken venv at {} — surfacing the failure",
+                            venv_dir.display()
+                        );
+                    } else {
+                        log::warn!(
+                            "Backend exit matched a broken-venv signature ({}) but the venv at {} probes healthy — keeping it (data-safe guard) and surfacing the real error",
+                            exit_info,
+                            venv_dir.display()
+                        );
                     }
-                    log::error!(
-                        "Could not remove broken venv at {} — surfacing the failure",
-                        venv_dir.display()
-                    );
                 }
                 let msg = if err_tail.is_empty() {
                     format!("Backend process exited ({}) — no error output captured", exit_info)
@@ -273,12 +330,34 @@ pub fn spawn_backend_and_wait(app: &tauri::AppHandle, stage_handle: &Arc<Mutex<B
 /// first to reach Ready claims this and the rest fall through.
 static SUPERVISOR_ACTIVE: AtomicBool = AtomicBool::new(false);
 
-/// Give up (surface Failed) if the backend dies this many times within
-/// `RESTART_WINDOW` — a deterministic startup crash must not become a
-/// fork-bomb. The #314 broken-venv self-heal stays the venv-failure path; the
+/// #941: set while a retry/clean-retry flow deliberately kills the backend to
+/// replace it, so the death watchers (startup poll + supervisor) never write a
+/// crash marker for — or respawn against — an *intentional* kill. Cleared the
+/// moment a fresh child is spawned and tracked (`track_backend_child`).
+static BACKEND_KILL_INTENDED: AtomicBool = AtomicBool::new(false);
+
+pub fn set_backend_kill_intended(value: bool) {
+    BACKEND_KILL_INTENDED.store(value, Ordering::SeqCst);
+}
+
+fn backend_kill_intended() -> bool {
+    BACKEND_KILL_INTENDED.load(Ordering::SeqCst)
+}
+
+/// How much of backend_err.log rides inside a crash marker (#941). ~40 lines
+/// is enough for a Python traceback or a native abort banner without bloating
+/// the marker file or the bug-report URL (the frontend truncates further).
+const CRASH_STDERR_TAIL_LINES: usize = 40;
+
+/// Crash-loop escalation guard (#941, supersedes the #567 5-in-60s budget):
+/// give up (surface Failed with the crash details) once the backend has died
+/// `MAX_RESTARTS` times inside `RESTART_WINDOW`. The longer 10-minute window
+/// catches *slow* crash loops (e.g. an engine that OOMs a couple of minutes
+/// into every generation) that the old 60-second window let spin silently
+/// forever. The #314 broken-venv self-heal stays the venv-failure path; the
 /// supervisor only handles post-Ready deaths.
-const MAX_RESTARTS: usize = 5;
-const RESTART_WINDOW: Duration = Duration::from_secs(60);
+const MAX_RESTARTS: usize = 3;
+const RESTART_WINDOW: Duration = Duration::from_secs(600);
 
 fn app_is_quitting(app: &tauri::AppHandle) -> bool {
     app.try_state::<AppFlags>()
@@ -286,17 +365,39 @@ fn app_is_quitting(app: &tauri::AppHandle) -> bool {
         .unwrap_or(false)
 }
 
-/// Returns `Some(exit description)` if the tracked backend child has exited,
+/// Store the freshly spawned backend child (and its spawn time, for the crash
+/// marker's `uptime_s`), and re-arm the death watchers: any deliberate-kill
+/// window ends the moment a new child is tracked.
+fn track_backend_child(app: &tauri::AppHandle, child: Option<std::process::Child>) {
+    let state = app.state::<BackendState>();
+    if let Ok(mut guard) = state.process.lock() {
+        *guard = child;
+    }
+    if let Ok(mut spawned) = state.spawned_at.lock() {
+        *spawned = Some(Instant::now());
+    }
+    set_backend_kill_intended(false);
+}
+
+/// Seconds since the tracked backend child was spawned (0 when unknown).
+fn backend_uptime_s(app: &tauri::AppHandle) -> u64 {
+    app.try_state::<BackendState>()
+        .and_then(|s| s.spawned_at.lock().ok().and_then(|g| *g))
+        .map(|t| t.elapsed().as_secs())
+        .unwrap_or(0)
+}
+
+/// Returns `Some(BackendExit)` if the tracked backend child has exited,
 /// `None` if it is still running (or none is tracked — which we never treat as
 /// a death to respawn, to avoid fighting a deliberate teardown).
-fn backend_child_exit(app: &tauri::AppHandle) -> Option<String> {
+fn backend_child_exit(app: &tauri::AppHandle) -> Option<BackendExit> {
     let state = app.try_state::<BackendState>()?;
     let mut guard = state.process.lock().ok()?;
     match guard.as_mut() {
         Some(child) => match child.try_wait() {
-            Ok(Some(status)) => Some(status.to_string()),
+            Ok(Some(status)) => Some(BackendExit::from_status(status)),
             Ok(None) => None,
-            Err(e) => Some(format!("try_wait error: {e}")),
+            Err(e) => Some(BackendExit::unknown(&format!("try_wait error: {e}"))),
         },
         None => None,
     }
@@ -323,21 +424,39 @@ fn supervise_backend(app: &tauri::AppHandle, stage_handle: &Arc<Mutex<BootstrapS
         if app_is_quitting(app) {
             return;
         }
-        let exit_info = match backend_child_exit(app) {
-            Some(info) => info,
+        let exit = match backend_child_exit(app) {
+            Some(exit) => exit,
             None => continue, // still running
         };
         // The exit may have raced with a shutdown that killed the child.
         if app_is_quitting(app) {
             return;
         }
+        // A retry/clean-retry flow killed the child on purpose and owns the
+        // respawn — no crash marker, and step aside so the retry's own
+        // spawn_backend_and_wait claims the supervisor slot at Ready (#941).
+        if backend_kill_intended() {
+            log::info!("Backend exit was a deliberate replace — supervisor yielding to the retry flow");
+            return;
+        }
+        let exit_info = exit.description.clone();
+        // #941: make the death self-documenting BEFORE any restart attempt —
+        // the marker (exit code/signal + stderr tail + uptime) is what turns
+        // the next "Can't reach the backend" report into a diagnosable one.
+        let uptime_s = backend_uptime_s(app);
+        crate::crash::record_crash(crate::crash::marker_now(
+            &exit,
+            uptime_s,
+            crate::backend::read_error_log_tail(CRASH_STDERR_TAIL_LINES),
+        ));
         if restart_budget_exhausted(&mut restart_times, Instant::now()) {
             let tail = crate::backend::read_error_log_tail(30);
             let msg = format!(
-                "The backend kept crashing ({} times in {}s) and couldn't be kept running. \
-                 Use Clean & Retry, or check Settings → Logs → Backend.{}",
+                "The backend kept crashing ({} times in {} min; last death: {}) and couldn't \
+                 be kept running. Use Clean & Retry, or check Settings → Logs → Backend.{}",
                 MAX_RESTARTS,
-                RESTART_WINDOW.as_secs(),
+                RESTART_WINDOW.as_secs() / 60,
+                exit.label(),
                 if tail.is_empty() { String::new() } else { format!("\n\nLast output:\n{tail}") },
             );
             log::error!("Backend supervisor giving up: {msg}");
@@ -358,9 +477,7 @@ fn supervise_backend(app: &tauri::AppHandle, stage_handle: &Arc<Mutex<BootstrapS
             std::thread::sleep(Duration::from_millis(300));
         }
         let child = crate::backend::spawn_backend(app, Some(stage_handle));
-        if let Ok(mut guard) = app.state::<BackendState>().process.lock() {
-            *guard = child;
-        }
+        track_backend_child(app, child);
         // Wait (bounded) for the respawn to become healthy. If it dies again
         // immediately, bail early so the next loop counts it toward the cap.
         let start = Instant::now();
@@ -395,6 +512,7 @@ pub fn clean_and_retry_bootstrap(app: tauri::AppHandle, state: tauri::State<'_,
     // project dir, otherwise bootstrap will "attach" to the stale process.
     if crate::backend::port_in_use(backend_port()) {
         log::warn!("Clean retry: killing stale backend on port {}", backend_port());
+        set_backend_kill_intended(true); // deliberate kill, not a crash (#941)
         crate::backend::kill_orphan_on_port(backend_port());
         std::thread::sleep(Duration::from_millis(500));
     }
@@ -451,6 +569,16 @@ fn refresh_project_manifests(resource_dir: &Path, project_dir: &Path) -> bool {
             log::warn!("Could not refresh pyproject.toml from bundle: {}", e);
         }
     }
+    // Keep the shipped CHANGELOG.md current too — the backend's
+    // GET /api/settings/changelog (Settings → Updates "What's new" viewer)
+    // reads it from the project root, so an upgraded app must not show the
+    // notes from whenever the install was first created. Best-effort.
+    let res_changelog = res_root.join("CHANGELOG.md");
+    if res_changelog.is_file() {
+        if let Err(e) = fs::copy(&res_changelog, project_dir.join("CHANGELOG.md")) {
+            log::warn!("Could not refresh CHANGELOG.md from bundle: {}", e);
+        }
+    }
     if !res_uvlock.is_file() {
         return false;
     }
@@ -503,6 +631,26 @@ Fix: install Python 3.11+ from https://www.python.org/downloads/ (tick \"Add to
 then relaunch — OmniVoice will use your system Python. Advanced: set \
 UV_PYTHON_INSTALL_MIRROR to a reachable mirror (see docs/install/troubleshooting.md).";
 
+/// #889: PyTorch stopped shipping macOS x86_64 wheels after 2.2.x, and the
+/// locked dependency set needs a far newer torch (transformers 5.x requires
+/// ≥2.6) — so `uv sync` can never resolve on an Intel Mac and the local
+/// backend is unsupported there. Surfaced *before* any venv create/sync so
+/// Intel-Mac users see this immediately instead of a raw resolver error after
+/// minutes of downloads. Deliberately NOT checked when a healthy venv already
+/// exists, so any pre-torch-bump install that still works keeps working.
+const INTEL_MAC_UNSUPPORTED_MSG: &str =
+    "Intel Macs can't run the local AI backend — PyTorch no longer ships Intel-Mac (macOS x86_64) \
+builds, so the Python environment can't be installed on this machine. The app UI works, but local \
+voice generation is unavailable here. Options: point the app at a remote backend running on \
+another machine (Settings → Sharing → Remote backend), or use an Apple Silicon Mac / Windows / \
+Linux. See docs/install/macos.md (#889).";
+
+/// True on macOS x86_64 builds (#889). `cfg!` (not `#[cfg]`) keeps the guard
+/// compiled — and the message testable — on every platform.
+fn intel_mac_backend_unsupported() -> bool {
+    cfg!(all(target_os = "macos", target_arch = "x86_64"))
+}
+
 /// Strip the bundled-runtime Python env vars before spawning any `uv`/venv/pip
 /// or venv-python subprocess (#144). On the Linux AppImage, the bundled runtime
 /// exports PYTHONHOME / PYTHONPATH (and sometimes LD_LIBRARY_PATH) pointing at
@@ -556,9 +704,14 @@ fn sync_failure_is_torch_download(tail: &str) -> bool {
         || (low.contains("torch") && (low.contains("failed to download") || low.contains("failed to fetch")))
 }
 
-/// Default PyTorch ROCm wheel index for the opt-in AMD path (#124). ROCm 6.2 is
-/// the current stable wheel set; overridable via OMNIVOICE_TORCH_INDEX.
-const ROCM_TORCH_INDEX: &str = "https://download.pytorch.org/whl/rocm6.2";
+/// Default PyTorch ROCm wheel index for the opt-in AMD path (#124).
+/// ROCm 6.4, not 6.2: the app's pinned `torch==2.8.0` (pyproject.toml) has no
+/// build on the rocm6.2 index (it tops out at 2.5.1), so that index silently
+/// failed the reinstall and left the default CUDA build in place — which runs
+/// on CPU on an AMD GPU (#972). rocm6.4 carries a matching 2.8.0 build.
+/// Overridable via OMNIVOICE_TORCH_INDEX (e.g. a `--find-links` URL for
+/// distro-matched ROCm builds torch's own index doesn't carry).
+const ROCM_TORCH_INDEX: &str = "https://download.pytorch.org/whl/rocm6.4";
 
 /// `uv pip install` args that replace the default CUDA torch build with the AMD
 /// ROCm wheel (#124). Opt-in (gated on OMNIVOICE_TORCH_VARIANT=rocm by the
@@ -680,6 +833,252 @@ pub fn backend_exit_indicates_broken_venv(exit_info: &str, err_tail: &str) -> bo
         || exit_info.trim_end().ends_with(": 106")
 }
 
+/// Data-safe guard for the destructive half of the #314 self-heal
+/// (feat/safe-updates): an exit-*signature* match alone is text matching on a
+/// stderr tail — before it is allowed to delete a multi-GB venv, the venv must
+/// be *confirmed* broken by direct evidence:
+///
+/// - a structural problem found by [`venv_structural_problem`] (missing
+///   pyvenv.cfg / missing or dangling python) is definitive → rebuild;
+/// - otherwise the venv's own interpreter is probed
+///   ([`venv_interpreter_probe`]): if it provably starts and imports its
+///   stdlib (`Some(true)`), the venv is NOT the problem — deleting it would
+///   destroy a working ~6 GB install to "fix" an unrelated crash, so the
+///   rebuild is refused and the real error is surfaced instead;
+/// - a failed probe (`Some(false)`) or one that couldn't even spawn (`None`)
+///   confirms the interpreter is unrunnable → rebuild.
+pub fn venv_rebuild_justified(
+    structural_problem: Option<&str>,
+    interpreter_probe: Option<bool>,
+) -> bool {
+    if structural_problem.is_some() {
+        return true;
+    }
+    !matches!(interpreter_probe, Some(true))
+}
+
+/// Run the venv's python directly to check the interpreter can bootstrap its
+/// stdlib. `Some(true)` = healthy, `Some(false)` = starts but fails (e.g. the
+/// venv launcher's exit 106, or the 'encodings' bootstrap abort), `None` = the
+/// binary couldn't be spawned at all. Env is scrubbed (#144) so an AppImage's
+/// bundled-Python vars can't fake a failure on a healthy venv.
+fn venv_interpreter_probe(venv_py: &Path) -> Option<bool> {
+    let mut cmd = Command::new(venv_py);
+    scrub_python_env(&mut cmd);
+    cmd.args(["-c", "import encodings"])
+        .stdout(Stdio::null())
+        .stderr(Stdio::null());
+    match cmd.status() {
+        Ok(status) => Some(status.success()),
+        Err(_) => None,
+    }
+}
+
+// ── Linux/Windows: cuDNN 8 compat side-load ────────────────────────────────
+//
+// This used to live ONLY in scripts/setup.py, run via `bun run setup:api`
+// (dev loop only). Neither `scripts/` nor `setup.py` is bundled as a Tauri
+// resource (see tauri.conf.json's `bundle.resources`), and the real
+// packaged-install bootstrap path below never called that script — so every
+// actual installed user with an NVIDIA GPU got a venv with no cuDNN 8 compat
+// libs (#827). Ported here so the real app-data venv gets them, matching what
+// backend/main.py's cuDNN preload (#255) expects to find.
+//
+// (An earlier draft of #869 also ported setup.py's VC++ Redistributable
+// check. Dropped as dead code per review: the Tauri exe itself dynamically
+// links the MSVC CRT, so `LoadLibraryA("vcruntime140.dll")` from a *running*
+// app is a tautology — and torch's real failure mode is msvcp140.dll inside
+// the venv python process, not this one.)
+
+/// Cross-platform pin, matches the wheel scripts/setup.py has always used —
+/// keep both in sync if this ever needs to move.
+const CUDNN8_COMPAT_PIN: &str = "nvidia-cudnn-cu12==8.9.7.29";
+
+/// The `cudnn8_compat/` install target inside a venv's site-packages,
+/// mirroring `_find_compat_dir()` in scripts/setup.py exactly (and what
+/// backend/main.py's ctypes preload looks for). Linux's path is versioned by
+/// the venv's own Python (`lib/pythonX.Y/site-packages`), so this queries the
+/// live interpreter rather than assuming the version `uv venv` was asked for
+/// — the system-Python fallback path can hand back a different one.
+fn cudnn8_compat_dir(venv_dir: &Path, venv_py: &Path) -> Option<PathBuf> {
+    if cfg!(windows) {
+        return Some(venv_dir.join("Lib").join("site-packages").join("cudnn8_compat"));
+    }
+    let out = Command::new(venv_py)
+        .args(["-c", "import sys; print(f'{sys.version_info.major}.{sys.version_info.minor}')"])
+        .output()
+        .ok()?;
+    if !out.status.success() {
+        return None;
+    }
+    let pyver = String::from_utf8_lossy(&out.stdout).trim().to_string();
+    Some(
+        venv_dir
+            .join("lib")
+            .join(format!("python{}", pyver))
+            .join("site-packages")
+            .join("cudnn8_compat"),
+    )
+}
+
+/// The subdirectory (within `cudnn8_compat/`) actually holding the shared
+/// libraries, and the filename pattern that counts as "installed" — same
+/// glob scripts/setup.py's `_count_cudnn8_libs()` uses.
+fn cudnn8_lib_dir_and_pattern(compat_dir: &Path) -> (PathBuf, &'static str, &'static str) {
+    if cfg!(windows) {
+        (compat_dir.join("nvidia").join("cudnn").join("bin"), "cudnn", "64_8.dll")
+    } else {
+        (compat_dir.join("nvidia").join("cudnn").join("lib"), "libcudnn", ".so.8")
+    }
+}
+
+fn count_cudnn8_libs(lib_dir: &Path, prefix: &str, suffix: &str) -> usize {
+    fs::read_dir(lib_dir)
+        .map(|entries| {
+            entries
+                .filter_map(|e| e.ok())
+                .filter(|e| {
+                    let name = e.file_name();
+                    let name = name.to_string_lossy();
+                    name.starts_with(prefix) && name.ends_with(suffix)
+                })
+                .count()
+        })
+        .unwrap_or(0)
+}
+
+/// Verdict from probing the venv's torch (see `CUDNN8_CUDA_PROBE_PY`).
+#[derive(Debug, PartialEq, Eq)]
+enum CudnnProbe {
+    /// CUDA torch build with a live CUDA device: side-load cuDNN 8.
+    Install,
+    /// Definitive no — CPU-only box, no NVIDIA device, or a ROCm torch build
+    /// (HIP reports `torch.cuda.is_available() == True`, but the ~700 MB CUDA
+    /// `nvidia-cudnn-cu12` wheel is pure waste on an AMD box, #124). Cache it
+    /// so the synchronous `import torch` never taxes this venv's launches
+    /// again.
+    CacheNegative,
+    /// The probe didn't run cleanly (torch missing / broken venv / unexpected
+    /// output) — skip this launch but do NOT cache, so a transient failure
+    /// can't permanently disable the side-load on a real CUDA machine.
+    SkipNoCache,
+}
+
+/// Prints exactly one verdict: `hip` (ROCm build — checked BEFORE
+/// `cuda.is_available()`, which HIP spoofs), `cuda` (CUDA build with a live
+/// device), or `none`.
+const CUDNN8_CUDA_PROBE_PY: &str = "import torch; print('hip' if getattr(torch.version, 'hip', None) else 'cuda' if torch.cuda.is_available() else 'none')";
+
+fn classify_cuda_probe(stdout: &str) -> CudnnProbe {
+    match stdout.trim() {
+        "cuda" => CudnnProbe::Install,
+        "hip" | "none" => CudnnProbe::CacheNegative,
+        _ => CudnnProbe::SkipNoCache,
+    }
+}
+
+/// Marker recording a cached negative CUDA probe for this venv. Lives inside
+/// `.venv/` so a full venv rebuild ("Clean & Retry") clears it implicitly;
+/// anything that re-syncs the venv in place must call
+/// `invalidate_cudnn8_probe_cache` (the torch build may have changed).
+fn cudnn8_probe_marker(venv_dir: &Path) -> PathBuf {
+    venv_dir.join(".cudnn8_probe_negative")
+}
+
+/// Call after ANY operation that can change the venv's torch build (drift /
+/// repair / first-run `uv sync`, ROCm reinstall) so the next launch re-probes
+/// exactly once per venv lifetime.
+fn invalidate_cudnn8_probe_cache(venv_dir: &Path) {
+    let _ = fs::remove_file(cudnn8_probe_marker(venv_dir));
+}
+
+/// CTranslate2 (faster-whisper / WhisperX) needs cuDNN 8, but PyTorch 2.8+
+/// pulls in cuDNN 9. Side-loads cuDNN 8 into `cudnn8_compat/` next to the
+/// venv's other packages — backend/main.py preloads it via ctypes at import
+/// time (#255). Skipped entirely on macOS (no CUDA), on any machine without
+/// a CUDA device, and on ROCm torch builds (#124) — and a negative probe is
+/// cached per venv so CPU/AMD installs never pay the synchronous
+/// `import torch` more than once (#869 review).
+fn ensure_cudnn8_compat<R: tauri::Runtime>(
+    app: &tauri::AppHandle<R>,
+    uv_path: &Path,
+    venv_py: &Path,
+    venv_dir: &Path,
+    project_dir: &Path,
+) {
+    if cfg!(target_os = "macos") {
+        return;
+    }
+    // Cached negative from a previous launch (CPU/Intel/AMD — the majority of
+    // installs): return before spending any subprocess. Cleared whenever the
+    // venv is rebuilt or re-synced.
+    let marker = cudnn8_probe_marker(venv_dir);
+    if marker.is_file() {
+        return;
+    }
+    let Some(compat_dir) = cudnn8_compat_dir(venv_dir, venv_py) else {
+        log::warn!("cuDNN 8 compat: could not resolve venv site-packages layout — skipping");
+        return;
+    };
+    let (lib_dir, prefix, suffix) = cudnn8_lib_dir_and_pattern(&compat_dir);
+    if count_cudnn8_libs(&lib_dir, prefix, suffix) >= 5 {
+        return;
+    }
+
+    let mut cuda_check = Command::new(venv_py);
+    scrub_python_env(&mut cuda_check);
+    let verdict = cuda_check
+        .args(["-c", CUDNN8_CUDA_PROBE_PY])
+        .output()
+        .ok()
+        .filter(|o| o.status.success())
+        .map(|o| String::from_utf8_lossy(&o.stdout).trim().to_string())
+        .unwrap_or_default();
+    match classify_cuda_probe(&verdict) {
+        CudnnProbe::Install => {}
+        CudnnProbe::CacheNegative => {
+            log::info!(
+                "cuDNN 8 compat: torch probe says '{}' — caching the negative result for this venv",
+                verdict
+            );
+            let _ = fs::write(&marker, format!("{}\n", verdict));
+            return;
+        }
+        CudnnProbe::SkipNoCache => {
+            log::warn!("cuDNN 8 compat: torch probe failed — skipping this launch (not cached)");
+            return;
+        }
+    }
+
+    log::info!("Installing cuDNN 8 compatibility libraries for CTranslate2 (#255)");
+    emit_log(app, "installing_deps", "Installing cuDNN 8 compatibility libraries for CUDA transcription…");
+    let mut cmd = Command::new(uv_path);
+    scrub_python_env(&mut cmd);
+    apply_uv_http_env(&mut cmd);
+    cmd.arg("pip")
+        .arg("install")
+        .arg("--no-deps")
+        .arg("--target")
+        .arg(&compat_dir)
+        .arg("--python")
+        .arg(venv_py)
+        .arg(CUDNN8_COMPAT_PIN)
+        .current_dir(project_dir);
+    match run_streaming(app, "installing_deps", &mut cmd) {
+        Ok(ref s) if s.success() => {
+            log::info!("cuDNN 8 compat installed: {} libraries", count_cudnn8_libs(&lib_dir, prefix, suffix));
+        }
+        other => {
+            log::warn!("cuDNN 8 compat install failed ({:?}) — CUDA transcription may not work", other);
+            emit_log(
+                app, "installing_deps",
+                "cuDNN 8 compat install failed — CUDA-based transcription may not work. \
+Retry from Settings, or see docs/install/troubleshooting.md.",
+            );
+        }
+    }
+}
+
 /// Prepare (and on first run, create) the Python venv that will host the
 /// backend process. Returns (venv_python, backend_source_dir).
 pub fn ensure_venv_ready<R: tauri::Runtime>(app: &tauri::AppHandle<R>, progress: Option<&Arc<Mutex<BootstrapStage>>>) -> Option<(PathBuf, PathBuf)> {
@@ -829,6 +1228,15 @@ manually, then relaunch.",
                 // #307: the source dirs above track the bundle, so the
                 // dependency manifests must too — otherwise an upgrade runs
                 // new code against a venv that predates newly added deps.
+                //
+                // Data-safety note (feat/safe-updates): this drift path — and
+                // the repair path below — reconcile the venv IN PLACE via
+                // `uv sync` (add/remove packages inside `.venv`); neither ever
+                // deletes the venv, and a failed sync keeps the old venv (see
+                // the error arm). The only venv-destroying paths are the #314
+                // broken-venv heal (guarded by venv_rebuild_justified: a venv
+                // whose interpreter probes healthy is never deleted) and the
+                // explicit user-initiated "Clean & Retry".
                 if refresh_project_manifests(res, &project_dir) {
                     log::info!("uv.lock changed since the venv was synced — running uv sync (#307)");
                     if let Some(p) = progress {
@@ -851,6 +1259,9 @@ manually, then relaunch.",
                             match run_streaming(app, "installing_deps", &mut drift_cmd) {
                                 Ok(ref s) if s.success() => {
                                     log::info!("Dependency drift sync complete (#307)");
+                                    // The torch build may have changed — let
+                                    // ensure_cudnn8_compat() re-probe once.
+                                    invalidate_cudnn8_probe_cache(&venv_dir);
                                 }
                                 other => {
                                     // Don't brick a previously-working install
@@ -870,6 +1281,10 @@ the existing venv; newly added dependencies may be missing (#307)",
                     }
                 }
             }
+            match resolve_uv(app, &app_data, None) {
+                Ok(uv_path) => ensure_cudnn8_compat(app, &uv_path, &venv_py, &venv_dir, &project_dir),
+                Err(e) => log::warn!("cuDNN 8 compat: could not resolve uv: {}", e),
+            }
             return Some((venv_py, backend_dir));
         }
         if matches!(uvicorn_check, Ok(ref s) if s.success()) {
@@ -891,6 +1306,12 @@ the existing venv; newly added dependencies may be missing (#307)",
                 venv_dir.display()
             );
         }
+        // #889: a repair sync on an Intel Mac would just re-fail on the torch
+        // resolution — surface the real reason instead of the raw uv error.
+        if intel_mac_backend_unsupported() {
+            fail(progress, INTEL_MAC_UNSUPPORTED_MSG);
+            return None;
+        }
         if let Some(p) = progress {
             set_stage(p, BootstrapStage::InstallingDeps);
         }
@@ -915,6 +1336,10 @@ the existing venv; newly added dependencies may be missing (#307)",
         repair_cmd.current_dir(&project_dir);
         let repair_status = run_streaming(app, "installing_deps", &mut repair_cmd);
         if matches!(repair_status, Ok(ref s) if s.success()) {
+            // The repair sync may have changed the torch build — clear any
+            // cached negative CUDA probe so ensure_cudnn8_compat() below
+            // re-checks once.
+            invalidate_cudnn8_probe_cache(&venv_dir);
             // #248: after the repair sync, ensure pkg_resources landed. The repair
             // path is also triggered when pkg_resources is missing (see above), so
             // we must verify here rather than trusting that uv sync alone fixed it
@@ -980,20 +1405,30 @@ the existing venv; newly added dependencies may be missing (#307)",
                     return None;
                 }
             }
+            ensure_cudnn8_compat(app, &uv_path, &venv_py, &venv_dir, &project_dir);
             return Some((venv_py, backend_dir));
         }
         fail(progress, &format!("Repair uv sync failed: {:?}", repair_status));
         return None;
     }
 
+    // #889: pre-check before creating a venv or attempting any `uv sync`. A
+    // first-run install on an Intel Mac can only ever end in an unresolvable
+    // torch dependency, so fail fast with the honest message — before any
+    // download starts.
+    if intel_mac_backend_unsupported() {
+        fail(progress, INTEL_MAC_UNSUPPORTED_MSG);
+        return None;
+    }
+
     let resource_dir = app.path().resource_dir().ok()?;
     let flat = resource_dir.clone();
     let up2  = resource_dir.join("_up_").join("_up_");
 
-    let (resource_pyproject, resource_uvlock, resource_readme, resource_omnivoice, resource_backend) = if flat.join("pyproject.toml").is_file() {
-        (flat.join("pyproject.toml"), flat.join("uv.lock"), flat.join("README.md"), flat.join("omnivoice"), flat.join("backend"))
+    let (resource_pyproject, resource_uvlock, resource_readme, resource_changelog, resource_omnivoice, resource_backend) = if flat.join("pyproject.toml").is_file() {
+        (flat.join("pyproject.toml"), flat.join("uv.lock"), flat.join("README.md"), flat.join("CHANGELOG.md"), flat.join("omnivoice"), flat.join("backend"))
     } else if up2.join("pyproject.toml").is_file() {
-        (up2.join("pyproject.toml"), up2.join("uv.lock"), up2.join("README.md"), up2.join("omnivoice"), up2.join("backend"))
+        (up2.join("pyproject.toml"), up2.join("uv.lock"), up2.join("README.md"), up2.join("CHANGELOG.md"), up2.join("omnivoice"), up2.join("backend"))
     } else {
         fail(progress, &format!(
             "Missing bootstrap resources — checked flat={} and _up_={}",
@@ -1030,6 +1465,12 @@ the existing venv; newly added dependencies may be missing (#307)",
         let _ = fs::write(project_dir.join("README.md"), "# OmniVoice\n");
         log::warn!("No README.md in bundle — created stub");
     }
+    // Shipped release notes for the Settings → Updates "What's new" viewer
+    // (GET /api/settings/changelog). Optional: the endpoint degrades to
+    // `available: false` when absent.
+    if resource_changelog.is_file() {
+        let _ = fs::copy(&resource_changelog, project_dir.join("CHANGELOG.md"));
+    }
     let omnivoice_dir = project_dir.join("omnivoice");
     if resource_omnivoice.is_dir() {
         if let Err(e) = copy_dir_recursive(&resource_omnivoice, &omnivoice_dir) {
@@ -1231,6 +1672,11 @@ mirror in Settings → region/mirrors (see docs/install/troubleshooting.md).".to
         }
     }
 
+    // Fresh venv, fresh sync: a stale negative-probe marker (e.g. a venv
+    // recreated in place over a previous one) must not suppress the probe.
+    invalidate_cudnn8_probe_cache(&venv_dir);
+    ensure_cudnn8_compat(app, &uv_path, &venv_py, &venv_dir, &project_dir);
+
     // Opt-in AMD ROCm (#124): the default install ships the CUDA torch build,
     // so AMD-only machines fall back to CPU. If the user set
     // OMNIVOICE_TORCH_VARIANT=rocm, reinstall torch/torchaudio from the ROCm
@@ -1243,7 +1689,12 @@ mirror in Settings → region/mirrors (see docs/install/troubleshooting.md).".to
         apply_uv_http_env(&mut rocm_cmd);
         rocm_cmd.args(rocm_torch_reinstall_args(&rocm_url)).current_dir(&project_dir);
         let rocm_status = run_streaming(app, "installing_deps", &mut rocm_cmd);
-        if !matches!(rocm_status, Ok(ref s) if s.success()) {
+        if matches!(rocm_status, Ok(ref s) if s.success()) {
+            // The torch build just switched to ROCm: re-probe on the next
+            // launch (it reports 'hip' and re-caches the negative, so the
+            // CUDA cuDNN wheel is never fetched on an AMD box, #124).
+            invalidate_cudnn8_probe_cache(&venv_dir);
+        } else {
             log::warn!("ROCm torch reinstall failed ({:?}); keeping default torch build", rocm_status);
             emit_log(
                 app, "installing_deps",
@@ -1278,6 +1729,18 @@ mod tests {
         assert!(removed.contains("LD_LIBRARY_PATH"), "LD_LIBRARY_PATH must be scrubbed");
     }
 
+    #[test]
+    fn intel_mac_message_keeps_its_contract_phrases() {
+        // #889: BootstrapSplash.jsx routes this failure to the localized
+        // `bootstrap.hint_intel_mac` hint by matching the lead phrase, and the
+        // message must keep pointing users at the docs + the remote-backend
+        // escape hatch. Guard those load-bearing fragments against rewording.
+        assert!(INTEL_MAC_UNSUPPORTED_MSG.contains("Intel Macs can't run the local AI backend"));
+        assert!(INTEL_MAC_UNSUPPORTED_MSG.contains("docs/install/macos.md"));
+        assert!(INTEL_MAC_UNSUPPORTED_MSG.contains("Sharing → Remote backend"));
+        assert!(INTEL_MAC_UNSUPPORTED_MSG.contains("#889"));
+    }
+
     #[test]
     fn apply_uv_http_env_sets_timeouts_and_retries() {
         let mut cmd = Command::new("uv");
@@ -1293,6 +1756,15 @@ mod tests {
         assert_eq!(envs.get("UV_HTTP_RETRIES").map(String::as_str), Some("5"));
     }
 
+    #[test]
+    fn crash_loop_policy_is_three_deaths_in_ten_minutes() {
+        // #941 escalation guard: ≥3 crashes inside 10 min must stop the
+        // respawn loop and land on the Failed screen with the crash details —
+        // the old 5-in-60s budget let slow crash loops spin silently forever.
+        assert_eq!(MAX_RESTARTS, 3);
+        assert_eq!(RESTART_WINDOW, Duration::from_secs(600));
+    }
+
     #[test]
     fn restart_budget_caps_respawns_and_prunes_old_ones() {
         // Supervisor backoff policy (#567): fewer than MAX_RESTARTS deaths
@@ -1350,7 +1822,10 @@ mod tests {
         assert!(args.iter().any(|a| a == "torch"));
         assert!(args.iter().any(|a| a == "torchaudio"));
         let i = args.iter().position(|a| a == "--index-url").expect("has --index-url");
-        assert!(args[i + 1].contains("rocm6.2"), "default index is the rocm6.2 wheel set");
+        // rocm6.4, not rocm6.2: rocm6.2's index tops out at torch 2.5.1 and
+        // can't satisfy the app's torch==2.8.0 pin (#972) — a regression to
+        // rocm6.2 here would silently resurrect the CPU-fallback bug.
+        assert!(args[i + 1].contains("rocm6.4"), "default index is the rocm6.4 wheel set (matches torch==2.8.0)");
     }
 
     #[test]
@@ -1513,6 +1988,42 @@ mod tests {
         ));
     }
 
+    #[test]
+    fn venv_rebuild_requires_confirmed_breakage() {
+        // feat/safe-updates: an exit-signature match alone must not destroy a
+        // venv. A structural problem is definitive evidence → rebuild.
+        assert!(venv_rebuild_justified(Some("pyvenv.cfg is missing"), Some(true)));
+        assert!(venv_rebuild_justified(Some("python executable is missing"), None));
+        // No structural problem + interpreter provably healthy → NEVER delete
+        // (the data-safety property this guard exists for).
+        assert!(!venv_rebuild_justified(None, Some(true)));
+        // Interpreter starts but can't bootstrap (exit 106 / encodings abort)
+        // → confirmed broken → rebuild.
+        assert!(venv_rebuild_justified(None, Some(false)));
+        // Interpreter can't even be spawned → confirmed unrunnable → rebuild.
+        assert!(venv_rebuild_justified(None, None));
+    }
+
+    #[cfg(unix)]
+    #[test]
+    fn venv_interpreter_probe_maps_exit_status_and_spawn_failure() {
+        use std::os::unix::fs::PermissionsExt;
+        // A nonexistent binary can't spawn → None (still justifies a rebuild).
+        let missing = std::env::temp_dir().join("omnivoice-test-probe-missing-python");
+        assert_eq!(venv_interpreter_probe(&missing), None);
+        // Fake interpreters (exit 0 = healthy, exit 106 = the venv launcher's
+        // "No pyvenv.cfg" code) exercise the status mapping without needing a
+        // real python on the test runner.
+        let dir = temp_venv_dir("probe");
+        for (name, code, expected) in [("py-ok", 0, Some(true)), ("py-106", 106, Some(false))] {
+            let script = dir.join(name);
+            fs::write(&script, format!("#!/bin/sh\nexit {}\n", code)).unwrap();
+            fs::set_permissions(&script, fs::Permissions::from_mode(0o755)).unwrap();
+            assert_eq!(venv_interpreter_probe(&script), expected, "{}", name);
+        }
+        let _ = fs::remove_dir_all(&dir);
+    }
+
     /// #248: verify that the setuptools repair install uses the correct specifier.
     /// The specifier `"setuptools>=75,<80"` must be passed as a single argument so
     /// pip/uv interprets the range constraint as one requirement, not two.
@@ -1549,4 +2060,101 @@ mod tests {
         let v82: (u32, u32) = (82, 0);
         assert!(!(v82.0 >= 75 && v82.0 < 80), "82.x (pre-fix version) must NOT satisfy <80");
     }
+
+    // -- cuDNN 8 compat side-load (real prod bootstrap, not just dev) --------
+
+    #[cfg(windows)]
+    #[test]
+    fn cudnn8_compat_dir_matches_backend_main_py_layout() {
+        // backend/main.py hardcodes `.venv/Lib/site-packages/cudnn8_compat` on
+        // Windows (no pyver in the path) -- this must match exactly or the
+        // ctypes preload never finds what we just installed.
+        let venv_dir = PathBuf::from(r"C:\fake\project\.venv");
+        let venv_py = venv_python_path(&venv_dir);
+        let dir = cudnn8_compat_dir(&venv_dir, &venv_py).expect("windows path is pure, no subprocess needed");
+        assert_eq!(dir, venv_dir.join("Lib").join("site-packages").join("cudnn8_compat"));
+    }
+
+    #[test]
+    fn cudnn8_lib_dir_and_pattern_matches_platform_glob() {
+        // Mirrors scripts/setup.py's _cudnn8_lib_dir()/_count_cudnn8_libs() and
+        // backend/main.py's _cudnn8_glob exactly -- a divergence here means the
+        // Rust installer and the Python ctypes preload disagree on what counts
+        // as "installed".
+        let compat_dir = PathBuf::from("compat");
+        let (lib_dir, prefix, suffix) = cudnn8_lib_dir_and_pattern(&compat_dir);
+        if cfg!(windows) {
+            assert_eq!(lib_dir, compat_dir.join("nvidia").join("cudnn").join("bin"));
+            assert_eq!((prefix, suffix), ("cudnn", "64_8.dll"));
+            assert!("cudnn_ops64_8.dll".starts_with(prefix) && "cudnn_ops64_8.dll".ends_with(suffix));
+        } else {
+            assert_eq!(lib_dir, compat_dir.join("nvidia").join("cudnn").join("lib"));
+            assert_eq!((prefix, suffix), ("libcudnn", ".so.8"));
+            assert!("libcudnn_ops.so.8".starts_with(prefix) && "libcudnn_ops.so.8".ends_with(suffix));
+        }
+    }
+
+    #[test]
+    fn count_cudnn8_libs_counts_only_matching_files() {
+        let dir = temp_venv_dir("cudnn-count");
+        let (_, prefix, suffix) = cudnn8_lib_dir_and_pattern(Path::new(""));
+        // Two real matches...
+        fs::write(dir.join(format!("{prefix}_a{suffix}")), b"").unwrap();
+        fs::write(dir.join(format!("{prefix}_b{suffix}")), b"").unwrap();
+        // ...one file that only matches the prefix, one that only matches the
+        // suffix, and one totally unrelated file -- none of these should count.
+        fs::write(dir.join(format!("{prefix}_only_prefix.txt")), b"").unwrap();
+        fs::write(dir.join(format!("unrelated{suffix}")), b"").unwrap();
+        fs::write(dir.join("readme.md"), b"").unwrap();
+        assert_eq!(count_cudnn8_libs(&dir, prefix, suffix), 2);
+        let _ = fs::remove_dir_all(&dir);
+    }
+
+    #[test]
+    fn count_cudnn8_libs_zero_when_dir_missing() {
+        // First-run case: the compat dir doesn't exist yet -- must report 0,
+        // not error, so the caller's ">= 5" threshold cleanly triggers install.
+        let missing = std::env::temp_dir().join("omnivoice-test-cudnn8-does-not-exist");
+        let _ = fs::remove_dir_all(&missing);
+        assert_eq!(count_cudnn8_libs(&missing, "cudnn", "64_8.dll"), 0);
+    }
+
+    #[test]
+    fn classify_cuda_probe_gates_install_on_cuda_only() {
+        // 'cuda' (CUDA build + live device) is the ONLY verdict that triggers
+        // the ~700 MB nvidia-cudnn-cu12 download.
+        assert_eq!(classify_cuda_probe("cuda"), CudnnProbe::Install);
+        assert_eq!(classify_cuda_probe("cuda\n"), CudnnProbe::Install); // print() newline
+        // ROCm torch spoofs torch.cuda.is_available(); the probe reports
+        // 'hip' first so opt-in AMD installs (#124) never fetch the CUDA
+        // wheel -- and the negative is cacheable.
+        assert_eq!(classify_cuda_probe("hip\n"), CudnnProbe::CacheNegative);
+        // Plain no-CUDA box: cache so `import torch` never re-runs at launch.
+        assert_eq!(classify_cuda_probe("none"), CudnnProbe::CacheNegative);
+        // Broken venv / import error / garbage: skip this launch but never
+        // cache -- a transient failure must not wedge a real CUDA machine.
+        assert_eq!(classify_cuda_probe(""), CudnnProbe::SkipNoCache);
+        assert_eq!(
+            classify_cuda_probe("Traceback (most recent call last):"),
+            CudnnProbe::SkipNoCache
+        );
+    }
+
+    #[test]
+    fn cudnn8_probe_cache_marker_roundtrip() {
+        let venv_dir = temp_venv_dir("cudnn-probe-cache");
+        let marker = cudnn8_probe_marker(&venv_dir);
+        // Must live INSIDE the venv so a full rebuild clears it implicitly.
+        assert!(marker.starts_with(&venv_dir));
+        assert!(!marker.is_file());
+        fs::write(&marker, "none\n").unwrap();
+        assert!(marker.is_file());
+        // Re-sync invalidation: marker gone, next launch re-probes.
+        invalidate_cudnn8_probe_cache(&venv_dir);
+        assert!(!marker.is_file());
+        // Idempotent when the marker is already absent.
+        invalidate_cudnn8_probe_cache(&venv_dir);
+        assert!(!marker.is_file());
+        let _ = fs::remove_dir_all(&venv_dir);
+    }
 }

frontend/src-tauri/src/commands.rs

@@ -257,43 +257,121 @@ fn hf_hub_cache_dir() -> PathBuf {
 
 use enigo::{Direction, Enigo, Key, Keyboard, Settings as EnigoSettings};
 
+/// Error-kind builder the dictation widget switches on. Kinds are a plain
+/// string prefix ("a11y:" | "clipboard:" | "paste:") so the JS side can do
+/// `err.split(':')[0]` without a serde enum crossing the IPC boundary.
+fn kind_err(kind: &str, detail: impl std::fmt::Display) -> String {
+    format!("{kind}:{detail}")
+}
+
+/// How long the transcript must sit on the clipboard before the user's
+/// previous clipboard is restored: ~300ms covers slow paste consumers
+/// (Electron apps, remote desktops) without being user-noticeable.
+const CLIPBOARD_RESTORE_DELAY: Duration = Duration::from_millis(300);
+
+/// macOS Accessibility grant check — CGEvent key synthesis silently no-ops
+/// without it. Direct FFI against ApplicationServices: one symbol, not worth
+/// a crate.
+#[cfg(target_os = "macos")]
+fn accessibility_trusted() -> bool {
+    #[link(name = "ApplicationServices", kind = "framework")]
+    extern "C" {
+        fn AXIsProcessTrusted() -> bool;
+    }
+    unsafe { AXIsProcessTrusted() }
+}
+
+/// True when the app may synthesize keyboard input. On macOS this is the
+/// Accessibility grant (System Settings → Privacy & Security → Accessibility);
+/// other OSes don't gate synthetic input behind a permission, so always true.
+#[tauri::command]
+pub fn check_accessibility() -> bool {
+    #[cfg(target_os = "macos")]
+    {
+        accessibility_trusted()
+    }
+    #[cfg(not(target_os = "macos"))]
+    {
+        true
+    }
+}
+
+/// Deep-link into the macOS Privacy → Accessibility pane so the widget can
+/// walk the user straight to the toggle an "a11y:" error asked for. No-op on
+/// other OSes (nothing to grant there).
+#[tauri::command]
+pub fn open_accessibility_settings() {
+    #[cfg(target_os = "macos")]
+    {
+        let _ = std::process::Command::new("open")
+            .arg("x-apple.systempreferences:com.apple.preference.security?Privacy_Accessibility")
+            .spawn();
+    }
+}
+
 #[tauri::command]
 pub fn simulate_paste(text: Option<String>) -> Result<(), String> {
+    // macOS: fail loud BEFORE touching the clipboard if Accessibility isn't
+    // granted — otherwise the ⌘V below silently goes nowhere and the caller
+    // can't tell (the old fire-and-forget behavior).
+    #[cfg(target_os = "macos")]
+    if !accessibility_trusted() {
+        return Err(kind_err("a11y", "accessibility permission not granted"));
+    }
+
     // Write the transcript to the clipboard natively first: the widget window
     // is intentionally unfocused on macOS (so the simulated ⌘V reaches the
     // target app), which makes the WebView clipboard APIs (navigator.clipboard
     // / execCommand('copy')) fail silently there (#287). `text` is optional so
     // call sites that already populated the clipboard keep working.
+    //
+    // Save what the user had there first (text only — restoring images/files
+    // isn't worth the platform-specific surface) so dictation doesn't clobber
+    // their clipboard.
+    let mut saved: Option<String> = None;
     if let Some(t) = text {
         let mut cb = arboard::Clipboard::new()
-            .map_err(|e| format!("clipboard init failed: {e}"))?;
+            .map_err(|e| kind_err("clipboard", format!("init failed: {e}")))?;
+        saved = cb.get_text().ok();
         cb.set_text(t)
-            .map_err(|e| format!("clipboard write failed: {e}"))?;
+            .map_err(|e| kind_err("clipboard", format!("write failed: {e}")))?;
     }
 
     std::thread::sleep(Duration::from_millis(80));
 
     let mut enigo = Enigo::new(&EnigoSettings::default())
-        .map_err(|e| format!("Failed to init keyboard sim: {e}"))?;
+        .map_err(|e| kind_err("paste", format!("failed to init keyboard sim: {e}")))?;
 
     #[cfg(target_os = "macos")]
     {
         enigo.key(Key::Meta, Direction::Press)
-            .map_err(|e| format!("key press failed: {e}"))?;
+            .map_err(|e| kind_err("paste", format!("key press failed: {e}")))?;
         enigo.key(Key::Unicode('v'), Direction::Click)
-            .map_err(|e| format!("key click failed: {e}"))?;
+            .map_err(|e| kind_err("paste", format!("key click failed: {e}")))?;
         enigo.key(Key::Meta, Direction::Release)
-            .map_err(|e| format!("key release failed: {e}"))?;
+            .map_err(|e| kind_err("paste", format!("key release failed: {e}")))?;
     }
 
     #[cfg(not(target_os = "macos"))]
     {
         enigo.key(Key::Control, Direction::Press)
-            .map_err(|e| format!("key press failed: {e}"))?;
+            .map_err(|e| kind_err("paste", format!("key press failed: {e}")))?;
         enigo.key(Key::Unicode('v'), Direction::Click)
-            .map_err(|e| format!("key click failed: {e}"))?;
+            .map_err(|e| kind_err("paste", format!("key click failed: {e}")))?;
         enigo.key(Key::Control, Direction::Release)
-            .map_err(|e| format!("key release failed: {e}"))?;
+            .map_err(|e| kind_err("paste", format!("key release failed: {e}")))?;
+    }
+
+    // Best-effort restore of the user's clipboard once the target app has
+    // consumed the paste. Only on success — on a paste error the transcript
+    // stays on the clipboard so the user can ⌘V it manually as a fallback.
+    if let Some(prev) = saved {
+        std::thread::spawn(move || {
+            std::thread::sleep(CLIPBOARD_RESTORE_DELAY);
+            if let Ok(mut cb) = arboard::Clipboard::new() {
+                let _ = cb.set_text(prev);
+            }
+        });
     }
 
     Ok(())
@@ -316,24 +394,32 @@ pub fn simulate_paste(text: Option<String>) -> Result<(), String> {
 ///
 /// Returns `Err` if the input layer is unavailable (e.g. accessibility not
 /// granted) so the JS caller can fall back to the clipboard+paste path for
-/// that segment without double-inserting.
+/// that segment without double-inserting. Errors carry the same kind
+/// prefixes as `simulate_paste` ("a11y:" | "paste:").
 #[tauri::command]
 pub fn simulate_type(text: Option<String>, backspaces: Option<u32>) -> Result<(), String> {
+    // Same a11y gate as simulate_paste — `.text()`/`.key()` go through the
+    // identical CGEvent path on macOS and would silently no-op without it.
+    #[cfg(target_os = "macos")]
+    if !accessibility_trusted() {
+        return Err(kind_err("a11y", "accessibility permission not granted"));
+    }
+
     let mut enigo = Enigo::new(&EnigoSettings::default())
-        .map_err(|e| format!("Failed to init keyboard sim: {e}"))?;
+        .map_err(|e| kind_err("paste", format!("failed to init keyboard sim: {e}")))?;
 
     let n = backspaces.unwrap_or(0);
     for _ in 0..n {
         enigo
             .key(Key::Backspace, Direction::Click)
-            .map_err(|e| format!("backspace failed: {e}"))?;
+            .map_err(|e| kind_err("paste", format!("backspace failed: {e}")))?;
     }
 
     if let Some(t) = text {
         if !t.is_empty() {
             enigo
                 .text(&t)
-                .map_err(|e| format!("type failed: {e}"))?;
+                .map_err(|e| kind_err("paste", format!("type failed: {e}")))?;
         }
     }
 
@@ -441,3 +527,136 @@ pub fn save_text_file(path: String, contents: String) -> Result<(), String> {
     }
     std::fs::write(p, contents).map_err(|e| format!("write: {e}"))
 }
+
+// ── WebView cache repair (issue #879) ─────────────────────────────────────
+//
+// After an unclean shutdown (e.g. a Windows BSOD), WebView2's profile cache
+// (%LOCALAPPDATA%\<identifier>\EBWebView) can corrupt. Tauri's IPC custom
+// protocol then fails ("IPC custom protocol failed, Tauri will now use the
+// postMessage interface instead") and the postMessage fallback can break too,
+// so the splash never hears bootstrap events even with a healthy backend.
+// The splash's recovery panel (Windows-only affordance, error-state only)
+// calls `clear_webview_cache_and_relaunch` to fix it in one click.
+//
+// Deleting EBWebView from inside a running app fails — the WebView2 browser
+// processes hold locks on the profile — so this is a two-step dance:
+//   1. the command writes a marker file next to the cache and relaunches;
+//   2. the fresh process calls `clear_webview_cache_if_marked()` at the very
+//      top of `run()`, before any webview exists, and deletes the cache
+//      there — retrying briefly while the old instance's WebView2 children
+//      finish exiting.
+//
+// Everything below compiles on every platform (runtime `cfg!` guards, not
+// `#[cfg]`) so a macOS/Linux `cargo check` validates the whole path; the
+// behavior itself is Windows-only and the frontend never renders the button
+// elsewhere.
+
+const CLEAR_WEBVIEW_MARKER: &str = ".clear-webview-cache";
+const WEBVIEW_CACHE_DIR: &str = "EBWebView";
+
+/// (marker file, cache dir) under the pre-app local data dir. Mirrors
+/// `config::config_path_pre_app()` — `%LOCALAPPDATA%\<identifier>` on
+/// Windows — because step 2 runs before an `AppHandle` exists.
+fn webview_cache_paths() -> Option<(PathBuf, PathBuf)> {
+    let base = dirs_next::data_local_dir()?.join(crate::config::BUNDLE_IDENTIFIER);
+    Some((base.join(CLEAR_WEBVIEW_MARKER), base.join(WEBVIEW_CACHE_DIR)))
+}
+
+#[tauri::command]
+pub fn clear_webview_cache_and_relaunch(app: tauri::AppHandle) -> Result<(), String> {
+    if !cfg!(target_os = "windows") {
+        return Err("WebView cache repair is only available on Windows (WebView2)".into());
+    }
+    let (marker, cache) = webview_cache_paths()
+        .ok_or_else(|| "could not resolve the local app data directory".to_string())?;
+    if let Some(parent) = marker.parent() {
+        let _ = fs::create_dir_all(parent);
+    }
+    fs::write(&marker, b"requested by the splash recovery panel (issue #879)\n")
+        .map_err(|e| format!("write {}: {e}", marker.display()))?;
+    log::warn!(
+        "WebView cache repair requested (#879) — relaunching to clear {}",
+        cache.display()
+    );
+    app.restart()
+}
+
+/// Startup half of the repair: if the previous run left the marker, delete
+/// the WebView2 profile cache before any webview is created. Called at the
+/// top of `run()`. One-shot by design — the marker is removed first so a
+/// failing repair can never loop across launches.
+pub fn clear_webview_cache_if_marked() {
+    if !cfg!(target_os = "windows") {
+        return;
+    }
+    let Some((marker, cache)) = webview_cache_paths() else {
+        return;
+    };
+    if !marker.exists() {
+        return;
+    }
+    let _ = fs::remove_file(&marker);
+    if !cache.exists() {
+        return;
+    }
+    // `app.restart()` spawns the new process before the old one has fully
+    // exited, so its WebView2 children may still hold locks — retry briefly.
+    const ATTEMPTS: u32 = 20;
+    for attempt in 1..=ATTEMPTS {
+        match fs::remove_dir_all(&cache) {
+            Ok(()) => {
+                log::warn!(
+                    "cleared WebView2 profile cache at {} (attempt {attempt}) — issue #879 repair",
+                    cache.display()
+                );
+                return;
+            }
+            Err(e) if e.kind() == std::io::ErrorKind::NotFound => return,
+            Err(e) if attempt < ATTEMPTS => {
+                log::debug!("WebView2 cache still locked ({e}) — retrying");
+                std::thread::sleep(Duration::from_millis(500));
+            }
+            Err(e) => {
+                // Never brick startup over a failed repair: WebView2 rebuilds
+                // whatever subset survived, and the user can retry.
+                log::error!(
+                    "could not fully clear WebView2 cache at {}: {e} — continuing startup",
+                    cache.display()
+                );
+            }
+        }
+    }
+}
+
+#[cfg(test)]
+mod paste_error_tests {
+    use super::{kind_err, CLIPBOARD_RESTORE_DELAY};
+
+    #[test]
+    fn kind_err_prefixes_with_kind() {
+        assert_eq!(kind_err("a11y", "not granted"), "a11y:not granted");
+        assert_eq!(
+            kind_err("clipboard", "write failed: busy"),
+            "clipboard:write failed: busy"
+        );
+        assert_eq!(
+            kind_err("paste", "key press failed"),
+            "paste:key press failed"
+        );
+    }
+
+    #[test]
+    fn kind_survives_colons_in_detail() {
+        // The widget does `err.split(':')[0]` — details containing ':' (OS
+        // error strings usually do) must not corrupt the kind.
+        let e = kind_err("clipboard", "init failed: os error 5");
+        assert_eq!(e.split_once(':').map(|(k, _)| k), Some("clipboard"));
+    }
+
+    #[test]
+    fn restore_delay_is_about_300ms() {
+        // Contract with the widget layer: previous clipboard comes back
+        // ~300ms after the paste, long enough for slow paste consumers.
+        assert_eq!(CLIPBOARD_RESTORE_DELAY.as_millis(), 300);
+    }
+}

frontend/src-tauri/src/config.rs

@@ -154,7 +154,9 @@ pub fn load_config_pre_app() -> AppConfig {
         .unwrap_or_default()
 }
 
-const BUNDLE_IDENTIFIER: &str = "com.debpalash.omnivoice-studio";
+/// Also used by `commands::webview_cache_paths` (#879) to locate the WebView2
+/// profile cache before an `AppHandle` exists.
+pub const BUNDLE_IDENTIFIER: &str = "com.debpalash.omnivoice-studio";
 
 fn config_path_pre_app() -> Option<PathBuf> {
     portable_config_file()

frontend/src-tauri/src/crash.rs

@@ -0,0 +1,318 @@
+//! Backend crash forensics (#941).
+//!
+//! When the backend PROCESS dies (native CUDA abort, OOM kill, DLL crash),
+//! the user used to see only "Can't reach the local OmniVoice backend" — and
+//! the evidence (exit code, stderr tail) evaporated with the process. Every
+//! such report was undiagnosable without asking for logs nobody sends.
+//!
+//! This module makes every backend death self-documenting: the death watchers
+//! in `bootstrap.rs` (the startup health poll and the post-Ready supervisor)
+//! call [`record_crash`] with the exit status and captured stderr tail, which
+//! persists a small JSON **crash marker** next to the backend logs. The
+//! frontend reads the newest marker via the `get_last_backend_crash` command
+//! to replace the vague unreachable-toast with the honest story ("the backend
+//! crashed (exit code X)…"), and the bug-report prefill attaches it so the
+//! next #941-class GitHub issue arrives WITH the evidence.
+//!
+//! Only the last [`MAX_MARKERS`] crashes are kept. Acknowledgment is a
+//! persisted timestamp (not deletion!) so viewing the crash details doesn't
+//! destroy the evidence a subsequent bug report needs.
+
+use std::fs;
+use std::path::{Path, PathBuf};
+use std::process::ExitStatus;
+
+use serde::{Deserialize, Serialize};
+
+/// How many crash markers to retain (newest first).
+pub const MAX_MARKERS: usize = 3;
+
+// ── Exit-status decomposition ──────────────────────────────────────────────
+
+/// Structured view of how the backend child ended: the numeric exit code (or
+/// Unix signal) for the marker, plus the human-readable `ExitStatus` display
+/// for logs and bootstrap messages.
+#[derive(Clone, Debug, PartialEq)]
+pub struct BackendExit {
+    pub code: Option<i32>,
+    pub signal: Option<i32>,
+    pub description: String,
+}
+
+impl BackendExit {
+    pub fn from_status(status: ExitStatus) -> Self {
+        #[cfg(unix)]
+        let signal = {
+            use std::os::unix::process::ExitStatusExt;
+            status.signal()
+        };
+        #[cfg(not(unix))]
+        let signal = None;
+        BackendExit { code: status.code(), signal, description: status.to_string() }
+    }
+
+    /// For deaths we can't decompose (`try_wait` errored).
+    pub fn unknown(description: &str) -> Self {
+        BackendExit { code: None, signal: None, description: description.to_string() }
+    }
+
+    /// Short human label — "exit code 3221226505" / "signal 6" — for messages.
+    pub fn label(&self) -> String {
+        match (self.code, self.signal) {
+            (Some(c), _) => format!("exit code {}", c),
+            (None, Some(s)) => format!("signal {}", s),
+            (None, None) => self.description.clone(),
+        }
+    }
+}
+
+// ── Marker model ───────────────────────────────────────────────────────────
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+pub struct CrashMarker {
+    /// Unix seconds when the death was detected.
+    pub ts: u64,
+    /// Process exit code, when the OS reported one.
+    pub exit_code: Option<i32>,
+    /// Unix signal that killed the process (None on Windows / normal exits).
+    pub signal: Option<i32>,
+    /// Human-readable `ExitStatus` display ("exit status: 134", …).
+    pub exit_desc: String,
+    /// App/backend version (lockstep per the versioning rule).
+    pub backend_version: String,
+    /// Seconds the backend had been running when it died.
+    pub uptime_s: u64,
+    /// Tail of backend_err.log captured at death time.
+    pub last_stderr: String,
+}
+
+/// The single on-disk store: newest-first markers plus the acknowledgment
+/// watermark. One file keeps rotation + ack updates atomic-ish and avoids
+/// filename collisions for same-second crashes.
+#[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
+pub struct CrashStore {
+    /// `ts` of the newest marker the user has acknowledged (seen). Markers
+    /// with `ts <= acked_ts` are "old news" for UI purposes but are retained
+    /// for bug-report attachment.
+    #[serde(default)]
+    pub acked_ts: u64,
+    /// Newest first, capped at [`MAX_MARKERS`].
+    #[serde(default)]
+    pub markers: Vec<CrashMarker>,
+}
+
+/// Prepend `marker` and keep only the newest [`MAX_MARKERS`]. Pure so the
+/// rotation policy is unit-tested without touching the filesystem.
+pub fn push_marker(store: &mut CrashStore, marker: CrashMarker) {
+    store.markers.insert(0, marker);
+    store.markers.truncate(MAX_MARKERS);
+}
+
+/// Newest marker + whether the user has already acknowledged it.
+pub fn newest_with_ack(store: &CrashStore) -> Option<(CrashMarker, bool)> {
+    store.markers.first().map(|m| (m.clone(), m.ts <= store.acked_ts))
+}
+
+// ── Persistence ────────────────────────────────────────────────────────────
+
+/// The marker store lives next to the backend logs (same rationale: it's
+/// forensic output of the backend process, discoverable alongside
+/// backend.log / backend_err.log).
+pub fn markers_path() -> PathBuf {
+    crate::backend::backend_log_path().with_file_name("backend_crash_markers.json")
+}
+
+pub fn load_store_from(path: &Path) -> CrashStore {
+    fs::read_to_string(path)
+        .ok()
+        .and_then(|s| serde_json::from_str(&s).ok())
+        .unwrap_or_default()
+}
+
+pub fn save_store_to(path: &Path, store: &CrashStore) {
+    match serde_json::to_string_pretty(store) {
+        Ok(json) => {
+            if let Err(e) = fs::write(path, json) {
+                log::warn!("Could not persist crash marker to {}: {}", path.display(), e);
+            }
+        }
+        Err(e) => log::warn!("Could not serialize crash marker: {}", e),
+    }
+}
+
+fn now_unix_s() -> u64 {
+    std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .map(|d| d.as_secs())
+        .unwrap_or(0)
+}
+
+/// Build a marker for a death detected right now.
+pub fn marker_now(exit: &BackendExit, uptime_s: u64, last_stderr: String) -> CrashMarker {
+    CrashMarker {
+        ts: now_unix_s(),
+        exit_code: exit.code,
+        signal: exit.signal,
+        exit_desc: exit.description.clone(),
+        backend_version: env!("CARGO_PKG_VERSION").to_string(),
+        uptime_s,
+        last_stderr,
+    }
+}
+
+/// Persist an unexpected backend death. Called by the death watchers in
+/// `bootstrap.rs` AFTER they have ruled out intentional shutdowns (app quit,
+/// deliberate retry/clean-retry kills).
+pub fn record_crash(marker: CrashMarker) {
+    log::error!(
+        "Backend process died unexpectedly ({}, uptime {} s). Crash marker written. Stderr tail:\n{}",
+        marker.exit_desc,
+        marker.uptime_s,
+        if marker.last_stderr.is_empty() { "<none captured>" } else { &marker.last_stderr },
+    );
+    let path = markers_path();
+    let mut store = load_store_from(&path);
+    push_marker(&mut store, marker);
+    save_store_to(&path, &store);
+}
+
+// ── Tauri commands ─────────────────────────────────────────────────────────
+
+/// Newest crash marker + its acknowledgment state, as returned to the
+/// frontend (`get_last_backend_crash`).
+#[derive(Clone, Debug, Serialize)]
+pub struct CrashNotice {
+    #[serde(flatten)]
+    pub marker: CrashMarker,
+    pub acknowledged: bool,
+}
+
+/// Newest backend crash marker, or null when the backend has never crashed.
+/// `acknowledged` tells the UI whether the user already viewed/dismissed it.
+#[tauri::command]
+pub fn get_last_backend_crash() -> Option<CrashNotice> {
+    let store = load_store_from(&markers_path());
+    newest_with_ack(&store).map(|(marker, acknowledged)| CrashNotice { marker, acknowledged })
+}
+
+/// Mark the newest crash as seen. Deliberately does NOT delete the marker —
+/// the bug-report prefill still needs the evidence after the user viewed it.
+#[tauri::command]
+pub fn acknowledge_backend_crash() {
+    let path = markers_path();
+    let mut store = load_store_from(&path);
+    if let Some(newest_ts) = store.markers.first().map(|m| m.ts) {
+        if store.acked_ts < newest_ts {
+            store.acked_ts = newest_ts;
+            save_store_to(&path, &store);
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn marker(ts: u64) -> CrashMarker {
+        CrashMarker {
+            ts,
+            exit_code: Some(1),
+            signal: None,
+            exit_desc: format!("exit status: 1 (#{ts})"),
+            backend_version: "0.0.0-test".into(),
+            uptime_s: 42,
+            last_stderr: "Traceback…".into(),
+        }
+    }
+
+    #[test]
+    fn rotation_keeps_only_the_last_three_newest_first() {
+        // #941: write 4 markers → only the newest MAX_MARKERS survive.
+        let mut store = CrashStore::default();
+        for ts in [1, 2, 3, 4] {
+            push_marker(&mut store, marker(ts));
+        }
+        assert_eq!(store.markers.len(), MAX_MARKERS);
+        let kept: Vec<u64> = store.markers.iter().map(|m| m.ts).collect();
+        assert_eq!(kept, vec![4, 3, 2], "newest first, oldest dropped");
+    }
+
+    #[test]
+    fn ack_semantics_survive_newer_crashes() {
+        let mut store = CrashStore::default();
+        push_marker(&mut store, marker(100));
+        // Fresh crash → unacknowledged.
+        let (m, acked) = newest_with_ack(&store).expect("has a marker");
+        assert_eq!(m.ts, 100);
+        assert!(!acked, "a fresh crash must be unacknowledged");
+        // Viewing acks the newest…
+        store.acked_ts = 100;
+        assert!(newest_with_ack(&store).unwrap().1, "viewed crash is acknowledged");
+        // …but a NEWER crash re-arms the notice, and the marker itself is
+        // retained (evidence survives the ack — bug reports still attach it).
+        push_marker(&mut store, marker(200));
+        let (m2, acked2) = newest_with_ack(&store).unwrap();
+        assert_eq!(m2.ts, 200);
+        assert!(!acked2, "a newer crash must surface again");
+        assert_eq!(store.markers.len(), 2, "ack never deletes markers");
+    }
+
+    #[test]
+    fn store_roundtrips_through_json_and_defaults_when_missing() {
+        let dir = std::env::temp_dir().join(format!("omnivoice-test-941-{}", std::process::id()));
+        let _ = fs::remove_dir_all(&dir);
+        fs::create_dir_all(&dir).unwrap();
+        let path = dir.join("backend_crash_markers.json");
+
+        // Missing file → default store, never an error (first run).
+        assert_eq!(load_store_from(&path), CrashStore::default());
+        // Corrupt file → default store (a truncated write must not wedge the
+        // whole forensics path).
+        fs::write(&path, "{not json").unwrap();
+        assert_eq!(load_store_from(&path), CrashStore::default());
+
+        let mut store = CrashStore::default();
+        push_marker(
+            &mut store,
+            CrashMarker {
+                ts: 1,
+                exit_code: None,
+                signal: Some(6), // SIGABRT — the native-CUDA-abort shape
+                exit_desc: "signal: 6 (SIGABRT)".into(),
+                backend_version: "0.3.10".into(),
+                uptime_s: 7,
+                last_stderr: "CUDA error: an illegal memory access".into(),
+            },
+        );
+        store.acked_ts = 0;
+        save_store_to(&path, &store);
+        let loaded = load_store_from(&path);
+        assert_eq!(loaded, store, "Option fields (code=None, signal=Some) must roundtrip");
+        let _ = fs::remove_dir_all(&dir);
+    }
+
+    #[test]
+    fn backend_exit_labels_code_signal_and_unknown() {
+        let coded = BackendExit { code: Some(-1073740791), signal: None, description: "x".into() };
+        assert_eq!(coded.label(), "exit code -1073740791");
+        let signaled = BackendExit { code: None, signal: Some(9), description: "x".into() };
+        assert_eq!(signaled.label(), "signal 9");
+        let unknown = BackendExit::unknown("try_wait error: gone");
+        assert_eq!(unknown.label(), "try_wait error: gone");
+    }
+
+    #[cfg(unix)]
+    #[test]
+    fn backend_exit_decomposes_real_exit_statuses() {
+        use std::os::unix::process::ExitStatusExt;
+        // Normal exit with code 3.
+        let e = BackendExit::from_status(ExitStatus::from_raw(3 << 8));
+        assert_eq!(e.code, Some(3));
+        assert_eq!(e.signal, None);
+        // Killed by SIGABRT (6) — code is None, signal carries the story.
+        let k = BackendExit::from_status(ExitStatus::from_raw(6));
+        assert_eq!(k.code, None);
+        assert_eq!(k.signal, Some(6));
+        assert_eq!(k.label(), "signal 6");
+    }
+}

frontend/src-tauri/src/lib.rs

@@ -13,6 +13,7 @@ pub mod bootstrap;
 pub mod tools;
 pub mod backend;
 pub mod commands;
+pub mod crash;
 pub mod updater_channel;
 
 use std::process::Child;
@@ -41,6 +42,9 @@ pub fn backend_port() -> u16 {
 
 pub struct BackendState {
     pub process: Mutex<Option<Child>>,
+    /// When the tracked child was spawned — feeds the crash marker's
+    /// `uptime_s` (#941). Set alongside `process` in bootstrap.rs.
+    pub spawned_at: Mutex<Option<std::time::Instant>>,
 }
 
 pub struct AppFlags {
@@ -201,10 +205,129 @@ mod media_permission_tests {
     }
 }
 
+// ── Windows: dictation pill must never take foreground focus (#982) ────────
+//
+// Windows counterpart of #287 (macOS auto-paste — don't steal focus). The
+// pill is `.always_on_top(true).skip_taskbar(true)` and is documented above
+// (see `grant_webview_media_permissions`) as "deliberately unfocused so the
+// auto-paste lands in the target app" — true on macOS, but on Windows,
+// showing an always-on-top top-level window gives it Win32 foreground
+// activation by default (ordinary Windows window-manager behavior; macOS
+// doesn't force-activate a shown window the same way). Nothing marked the
+// pill non-activating, so on Windows it stole foreground on every show —
+// the synthesized Ctrl+V from `simulate_paste` landed back in the pill
+// instead of the app the user was dictating into, and because the pill
+// wrongly held focus for the whole session the target app never got it back
+// until the pill's auto-dismiss timer eventually hid it.
+//
+// Two pieces, both required (verified by reading how `.show()` is used at
+// the call sites below — several are followed by an explicit `set_focus()`
+// that would fight the style bit on its own):
+//   1. WS_EX_NOACTIVATE on the HWND, applied once right after creation, so
+//      the OS never grants this window foreground activation implicitly.
+//   2. `ShowWindow(SW_SHOWNOACTIVATE)` in place of `WebviewWindow::show()` at
+//      the pill's dictation-trigger call sites, and the explicit
+//      `set_focus()` calls at those same sites are skipped on Windows (the
+//      same way they already are on macOS below).
+//
+// The flag math (`with_noactivate_style`) is a plain function so it's
+// unit-testable on every platform — the actual Win32 syscalls that use it
+// are Windows-only and can't run under `cargo test` on a non-Windows runner.
+
+/// `WS_EX_NOACTIVATE` (winuser.h: `#define WS_EX_NOACTIVATE 0x08000000L`).
+/// Hardcoded rather than imported from the `windows` crate so `with_noactivate_style`
+/// below stays free of the Windows-only dependency and is testable everywhere.
+/// Only consumed by Windows-only code (or the platform-agnostic test module
+/// below) — `#[allow(dead_code)]` elsewhere, same as `is_app_origin` above.
+#[cfg_attr(not(windows), allow(dead_code))]
+const WS_EX_NOACTIVATE_BIT: isize = 0x0800_0000;
+
+/// OR `WS_EX_NOACTIVATE` into an existing extended window style, preserving
+/// every other bit already set (topmost, layered, etc. — the pill's
+/// `always_on_top(true)` sets one of these). Pure so it's unit-testable
+/// without a real HWND. See module comment above for why this exists.
+#[cfg_attr(not(windows), allow(dead_code))]
+fn with_noactivate_style(current_ex_style: isize) -> isize {
+    current_ex_style | WS_EX_NOACTIVATE_BIT
+}
+
+/// Mark the pill's HWND `WS_EX_NOACTIVATE`, once, right after creation — this
+/// holds for every later `.show()` regardless of call site (belt-and-braces
+/// alongside `show_pill_noactivate` below, which some call sites also need
+/// because they pair `.show()` with an explicit `set_focus()`).
+#[cfg(target_os = "windows")]
+fn mark_pill_noactivate(win: &tauri::WebviewWindow) {
+    use windows::Win32::UI::WindowsAndMessaging::{
+        GetWindowLongPtrW, SetWindowLongPtrW, GWL_EXSTYLE,
+    };
+    let Ok(hwnd) = win.hwnd() else {
+        log::warn!("pill: could not resolve HWND to apply WS_EX_NOACTIVATE (#982)");
+        return;
+    };
+    unsafe {
+        let current = GetWindowLongPtrW(hwnd, GWL_EXSTYLE);
+        SetWindowLongPtrW(hwnd, GWL_EXSTYLE, with_noactivate_style(current));
+    }
+}
+
+/// Show the pill without granting it foreground activation. Used instead of
+/// `WebviewWindow::show()` at the pill's dictation-trigger call sites on
+/// Windows — `.show()` maps to plain `ShowWindow(SW_SHOW)`, which relies on
+/// the NOACTIVATE style alone to suppress activation; `SW_SHOWNOACTIVATE` is
+/// the explicit, documented way to show a window without activating it and
+/// costs nothing extra now that the style bit is also set (#982).
+#[cfg(target_os = "windows")]
+fn show_pill_noactivate(win: &tauri::WebviewWindow) {
+    use windows::Win32::UI::WindowsAndMessaging::{ShowWindow, SW_SHOWNOACTIVATE};
+    let Ok(hwnd) = win.hwnd() else {
+        log::warn!("pill: could not resolve HWND for non-activating show (#982)");
+        return;
+    };
+    unsafe {
+        let _ = ShowWindow(hwnd, SW_SHOWNOACTIVATE);
+    }
+}
+
+#[cfg(test)]
+mod pill_noactivate_tests {
+    use super::{with_noactivate_style, WS_EX_NOACTIVATE_BIT};
+
+    #[test]
+    fn adds_noactivate_bit_without_clobbering_existing_style() {
+        // Stand-in for whatever bits the pill's always_on_top/skip_taskbar
+        // window already carries (e.g. WS_EX_TOPMOST = 0x00000008) —
+        // NOACTIVATE must be added on top, never replace them.
+        let topmost = 0x0000_0008isize;
+        let updated = with_noactivate_style(topmost);
+        assert_eq!(
+            updated & WS_EX_NOACTIVATE_BIT,
+            WS_EX_NOACTIVATE_BIT,
+            "NOACTIVATE bit must be set"
+        );
+        assert_eq!(updated & topmost, topmost, "pre-existing style bits must survive");
+    }
+
+    #[test]
+    fn idempotent_if_already_noactivate() {
+        assert_eq!(with_noactivate_style(WS_EX_NOACTIVATE_BIT), WS_EX_NOACTIVATE_BIT);
+    }
+
+    #[test]
+    fn matches_documented_win32_value() {
+        // winuser.h: #define WS_EX_NOACTIVATE 0x08000000L
+        assert_eq!(WS_EX_NOACTIVATE_BIT, 0x0800_0000);
+    }
+}
+
 // ── Tauri entry ───────────────────────────────────────────────────────────
 
 #[cfg_attr(mobile, tauri::mobile_entry_point)]
 pub fn run() {
+    // #879: if the previous run requested a WebView cache repair (splash
+    // recovery panel → clear_webview_cache_and_relaunch), perform it now —
+    // before any webview exists, so WebView2 holds no locks on the profile.
+    commands::clear_webview_cache_if_marked();
+
     // ── Detect pill mode from CLI args OR persisted config ────────────────
     // CLI flag takes precedence. If not passed, fall back to the
     // `launch_as_widget` config field (set via tray "Switch to Pill Mode" or
@@ -256,6 +379,8 @@ pub fn run() {
             commands::hf_cache_scan,
             commands::simulate_paste,
             commands::simulate_type,
+            commands::check_accessibility,
+            commands::open_accessibility_settings,
             commands::set_tray_recording,
             commands::quit_app,
             commands::save_text_file,
@@ -263,6 +388,9 @@ pub fn run() {
             commands::set_dictation_shortcut,
             commands::get_launch_as_widget,
             commands::set_launch_as_widget,
+            commands::clear_webview_cache_and_relaunch,
+            crash::get_last_backend_crash,
+            crash::acknowledge_backend_crash,
         ])
         .setup(move |app| {
             app.handle().plugin(tauri_plugin_dialog::init())?;
@@ -320,9 +448,15 @@ pub fn run() {
                 .skip_taskbar(true)
                 .center()
                 .build();
-                if let Err(e) = result {
+                if let Err(e) = &result {
                     log::error!("Failed to create widget window: {e:?}");
                 }
+                // Windows: mark the pill non-activating right away so it holds
+                // for every later `.show()` regardless of call site (#982).
+                #[cfg(target_os = "windows")]
+                if let Ok(win) = &result {
+                    mark_pill_noactivate(win);
+                }
             }
 
             app.manage(AppFlags {
@@ -356,12 +490,17 @@ pub fn run() {
                                         if win.move_window(Position::BottomCenter).is_err() {
                                             let _ = win.center();
                                         }
+                                        // Windows: show without granting foreground activation
+                                        // (#982) — `.show()` on other platforms is unaffected.
+                                        #[cfg(target_os = "windows")]
+                                        show_pill_noactivate(&win);
+                                        #[cfg(not(target_os = "windows"))]
                                         let _ = win.show();
-                                        // Don't steal focus on macOS: the simulated ⌘V from
-                                        // simulate_paste() must land in the app the user is
-                                        // dictating into — focusing the widget would swallow
-                                        // it (#287).
-                                        #[cfg(not(target_os = "macos"))]
+                                        // Don't steal focus on macOS or Windows: the simulated
+                                        // ⌘V/Ctrl+V from simulate_paste() must land in the app
+                                        // the user is dictating into — focusing the widget would
+                                        // swallow it (#287 macOS, #982 Windows).
+                                        #[cfg(not(any(target_os = "macos", target_os = "windows")))]
                                         let _ = win.set_focus();
                                     }
                                     let _ = app_handle.emit("tray-dictate", ());
@@ -512,7 +651,9 @@ pub fn run() {
                             // + focus the widget BEFORE emitting tray-dictate so
                             // the user sees the pill instead of silent recording.
                             // Positioning mirrors the global-shortcut handler:
-                            // bottom-center (WhisperFlow style).
+                            // bottom-center (WhisperFlow style). Windows skips the
+                            // focus (and uses a non-activating show) for the same
+                            // reason the global-shortcut handler does — see #982.
                             if let Some(win) = app.get_webview_window("widget") {
                                 if win.is_visible().unwrap_or(false) {
                                     let _ = app.emit("tray-dictate-stop", ());
@@ -520,8 +661,13 @@ pub fn run() {
                                     if win.move_window(Position::BottomCenter).is_err() {
                                         let _ = win.center();
                                     }
-                                    let _ = win.show();
-                                    let _ = win.set_focus();
+                                    #[cfg(target_os = "windows")]
+                                    show_pill_noactivate(&win);
+                                    #[cfg(not(target_os = "windows"))]
+                                    {
+                                        let _ = win.show();
+                                        let _ = win.set_focus();
+                                    }
                                     let _ = app.emit("tray-dictate", ());
                                 }
                             } else {
@@ -596,6 +742,17 @@ pub fn run() {
                 if let Some(win) = app.get_webview_window("widget") {
                     let _ = win.hide();
                 }
+                // Enforce the always-open-maximized contract (#881) at
+                // runtime: macOS can ignore `maximized: true` from
+                // tauri.conf.json at window creation when combined with the
+                // Overlay title-bar style, so the config flag alone isn't
+                // reliable. maximize() zooms the window — it never enters a
+                // fullscreen Space. Guarded by tests/test_window_launch_state.py.
+                if let Some(main_win) = app.get_webview_window("main") {
+                    if !main_win.is_maximized().unwrap_or(false) {
+                        let _ = main_win.maximize();
+                    }
+                }
             }
 
             // ── WebView media-capture permissions (mic for dictation) ────
@@ -620,6 +777,7 @@ pub fn run() {
             app.manage(bootstrap_state);
             app.manage(BackendState {
                 process: Mutex::new(None),
+                spawned_at: Mutex::new(None),
             });
 
             let app_handle = app.handle().clone();
@@ -638,13 +796,30 @@ pub fn run() {
                     set_stage(&stage_handle, BootstrapStage::AwaitingSetup);
                     return;
                 }
-                if backend::backend_healthy(backend_port()) {
-                    log::info!(
-                        "Port {} already serving OmniVoice backend — attaching",
-                        backend_port()
-                    );
-                    set_stage(&stage_handle, BootstrapStage::Ready);
-                    return;
+                match backend::running_backend_version(backend_port()) {
+                    Some(v) if backend::same_app_version(&v) => {
+                        log::info!(
+                            "Port {} already serving OmniVoice backend v{} — attaching",
+                            backend_port(), v
+                        );
+                        set_stage(&stage_handle, BootstrapStage::Ready);
+                        return;
+                    }
+                    Some(v) => {
+                        // Healthy-but-stale backend from a previous version —
+                        // the post-update orphan that made new installs run
+                        // old backend code. Replace it (see backend.rs
+                        // same_app_version for the full story).
+                        log::warn!(
+                            "Port {} serves a stale OmniVoice backend (v{} != app v{}) — replacing it",
+                            backend_port(),
+                            if v.is_empty() { "<unknown>" } else { v.as_str() },
+                            env!("CARGO_PKG_VERSION"),
+                        );
+                        backend::kill_orphan_on_port(backend_port());
+                        std::thread::sleep(Duration::from_millis(500));
+                    }
+                    None => {}
                 }
                 if backend::port_in_use(backend_port()) {
                     log::warn!(
@@ -701,6 +876,14 @@ pub fn run() {
 
     app.run(|app_handle, event| {
         if let tauri::RunEvent::ExitRequested { .. } = event {
+            // Raise the quitting flag FIRST: exits that don't pass through the
+            // tray Quit item (macOS ⌘Q, OS session end) would otherwise let a
+            // death watcher observe our own SIGTERM below and record a false
+            // "backend crashed" marker (#941).
+            app_handle
+                .state::<AppFlags>()
+                .quitting
+                .store(true, Ordering::SeqCst);
             if let Ok(mut lock) = app_handle.state::<BackendState>().process.lock() {
                 if let Some(ref mut child) = *lock {
                     let pid = child.id();

frontend/src-tauri/tauri.conf.json

@@ -74,6 +74,7 @@
       "../../pyproject.toml",
       "../../uv.lock",
       "../../README.md",
+      "../../CHANGELOG.md",
       "../../omnivoice",
       "../../backend"
     ],

frontend/src/App.jsx

@@ -42,6 +42,7 @@ import WorkspaceVoices from './components/WorkspaceVoices';
 import WorkspaceProjects from './components/WorkspaceProjects';
 import ErrorBoundary from './components/ErrorBoundary';
 import FloatingPill from './components/FloatingPill';
+import BackendCrashNotice from './components/BackendCrashNotice';
 // RemoteAuthGate is mounted at the true outermost provider in main-app.jsx so
 // it covers all app states (setup check / wizard / bootstrap), not just the
 // main studio return below. Do not re-wrap here — double-gating renders two
@@ -62,6 +63,7 @@ const LazyFallback = () => <div className="app-lazy-fallback">{i18n.t('app.loadi
 import { Toaster, toast } from 'react-hot-toast';
 import { toastErrorWithReport } from './utils/errorToast';
 import { addBreadcrumb } from './utils/breadcrumbs';
+import { recordValueMoment } from './utils/donationMoments';
 import {
   POPULAR_LANGS,
   POPULAR_ISO,
@@ -71,6 +73,7 @@ import {
   CLONE_MAX_SECONDS,
 } from './utils/constants';
 import { LANG_CODES } from './utils/languages';
+import { restoreProjectExtras } from './utils/projectState';
 import { API, apiFetch } from './api/client';
 import { flushMemory as apiFlushMemory } from './api/system';
 import {
@@ -415,9 +418,15 @@ function App() {
   const defaultTrack = useAppStore((s) => s.defaultTrack);
   const setDefaultTrack = useAppStore((s) => s.setDefaultTrack);
   const exportTracks = useAppStore((s) => s.exportTracks);
+  const setExportTracks = useAppStore((s) => s.setExportTracks);
   const previewSegIds = useAppStore((s) => s.previewSegIds);
   const speakerClones = useAppStore((s) => s.speakerClones);
   const setSpeakerClones = useAppStore((s) => s.setSpeakerClones);
+  // Multi-language batch picks (P1.4) — saved with the project payload.
+  const multiLangMode = useAppStore((s) => s.multiLangMode);
+  const setMultiLangMode = useAppStore((s) => s.setMultiLangMode);
+  const multiLangs = useAppStore((s) => s.multiLangs);
+  const setMultiLangs = useAppStore((s) => s.setMultiLangs);
 
   const setGlossaryTerms = useAppStore((s) => s.setGlossaryTerms);
   const dualSubs = useAppStore((s) => s.dualSubs);
@@ -449,6 +458,8 @@ function App() {
     closeDirection,
     saveDirection,
     setLastGenFingerprints,
+    fingerprintsByLang,
+    setFingerprintsByLang,
     incrementalPlan,
     recomputeIncremental,
   } = useSegmentEditing();
@@ -718,6 +729,7 @@ function App() {
       try {
         const finalName = await browserDownload(`${API}/audio/${sourceIdentifier}`, niceName);
         toast.success(i18n.t('app.toast_downloaded', { name: finalName }));
+        recordValueMoment('export'); // success-only donation moment
         try {
           await exportRecord({
             filename: finalName,
@@ -748,6 +760,7 @@ function App() {
 
       await exportAction({ source_filename: sourceIdentifier, destination_path: destPath, mode });
       toast.success(i18n.t('app.toast_exported', { name: fallbackName }));
+      recordValueMoment('export'); // success-only donation moment
       loadExportHistory();
     } catch (err) {
       console.error(err);
@@ -796,6 +809,7 @@ function App() {
           const { invoke } = await import('@tauri-apps/api/core');
           await invoke('save_text_file', { path: destPath, contents: text });
           toast.success(i18n.t('app.toast_saved', { path: destPath }), { id: fallbackName });
+          recordValueMoment('export'); // success-only donation moment
           try {
             await exportRecord({
               filename: fallbackName,
@@ -822,6 +836,7 @@ function App() {
         }
         const data = await res.json();
         toast.success(i18n.t('app.toast_saved', { path: data.path }), { id: fallbackName });
+        recordValueMoment('export'); // success-only donation moment
         try {
           await exportRecord({
             filename: data.display_name || fallbackName,
@@ -844,6 +859,7 @@ function App() {
       toast.loading(i18n.t('app.toast_processing', { name: fallbackName }), { id: fallbackName });
       const finalName = await browserDownload(url, fallbackName);
       toast.success(i18n.t('app.toast_downloaded', { name: finalName }), { id: fallbackName });
+      recordValueMoment('export'); // success-only donation moment
       try {
         await exportRecord({
           filename: finalName,
@@ -946,6 +962,17 @@ function App() {
         preserveBg,
         defaultTrack,
         speakerClones,
+        // P1.4 — multi-language batch setup + export-track prefs travel with
+        // the project. Additive: loaders default them when absent (see
+        // utils/projectState.js).
+        multiLangMode,
+        multiLangs,
+        exportTracks,
+        // P1.3 — per-language segment fingerprints, so reopening a project
+        // keeps every track's "Regen N changed" plan. Additive: legacy
+        // loaders ignore the key; segments' `translations` maps ride along
+        // inside dubSegments above.
+        segHashesByLang: fingerprintsByLang,
       },
     };
     try {
@@ -987,9 +1014,24 @@ function App() {
       setDubStep(s.dubStep === 'done' ? 'done' : s.dubSegments?.length ? 'editing' : 'idle');
       // Phase 4.5 — rehydrate per-segment fingerprints. The incremental plan
       // immediately shows "N segments changed" for any segments edited after
-      // the last generate.
-      setLastGenFingerprints(s.segHashes || {});
+      // the last generate. P1.3: prefer the per-language map; a legacy flat
+      // `segHashes` can only describe the project's saved target language.
+      if (
+        s.segHashesByLang &&
+        typeof s.segHashesByLang === 'object' &&
+        !Array.isArray(s.segHashesByLang)
+      ) {
+        setFingerprintsByLang(s.segHashesByLang);
+      } else {
+        setLastGenFingerprints(s.segHashes || {}, s.dubLangCode || 'en');
+      }
       setSpeakerClones(s.speakerClones || {});
+      // P1.4 — restore multi-lang picks; legacy payloads default to off/empty
+      // and leave the in-session exportTracks untouched (null sentinel).
+      const extras = restoreProjectExtras(s);
+      setMultiLangMode(extras.multiLangMode);
+      setMultiLangs(extras.multiLangs);
+      if (extras.exportTracks) setExportTracks(extras.exportTracks);
       toast.success(i18n.t('app.toast_opened', { name: data.name }));
     } catch (err) {
       toast.error(err.message);
@@ -1039,14 +1081,31 @@ function App() {
         })),
       );
       setDubTranscript(job.full_transcript || '');
-      setDubLang(item.language || 'Auto');
-      setDubLangCode(item.language_code || 'und');
+      // Older DBs froze the language/language_code COLUMNS at the ingest-time
+      // "" (the UPSERT didn't update them until #P0 fixed it), but the job_data
+      // JSON always carried the value generation set. Falling back to job_data
+      // restores existing rows correctly without a migration.
+      setDubLang(item.language || job.language || 'Auto');
+      setDubLangCode(item.language_code || job.language_code || 'und');
       setDubTracks(Object.keys(job.dubbed_tracks || {}));
       setDubStep(Object.keys(job.dubbed_tracks || {}).length > 0 ? 'done' : 'editing');
       // Phase 4.5 — seg_hashes are written per successful segment by
       // dub_generate.py. Reloading a half-generated dub lets the "Regen N
-      // changed" button resume right where the crash happened.
-      setLastGenFingerprints(job.seg_hashes || {});
+      // changed" button resume right where the crash happened. P1.3: prefer
+      // the per-language map (multi-track jobs); a legacy flat map belongs to
+      // the job's last-generated language — the code restored just above.
+      if (
+        job.seg_hashes_by_lang &&
+        typeof job.seg_hashes_by_lang === 'object' &&
+        !Array.isArray(job.seg_hashes_by_lang)
+      ) {
+        setFingerprintsByLang(job.seg_hashes_by_lang);
+      } else {
+        setLastGenFingerprints(
+          job.seg_hashes || {},
+          item.language_code || job.language_code || 'und',
+        );
+      }
       // Rehydrate the auto-extracted speaker clones so the CAST dropdown's
       // "🎤 From video" option reappears after a reload. Projects that
       // predate the speaker-clone feature have an empty map; the Extract
@@ -1211,6 +1270,10 @@ function App() {
 
       <FloatingPill />
 
+      {/* #941: honest surfacing of backend process crashes (exit code +
+          stderr tail from the shell's crash marker), with ack-on-view. */}
+      <BackendCrashNotice />
+
       <Header
         mode={mode}
         setMode={setMode}

frontend/src/api/batch.ts

@@ -36,6 +36,11 @@ export async function listBatchJobs(status?: string, limit = 50): Promise<BatchJ
   return apiJson<BatchJob[]>(`/batch/jobs?${qs.toString()}`);
 }
 
+/** Get a single batch job (used to resolve why a job left the active list). */
+export async function getBatchJob(id: string): Promise<BatchJob> {
+  return apiJson<BatchJob>(`/batch/jobs/${id}`);
+}
+
 /** Enqueue a video for batch dubbing. */
 export async function enqueueBatchJob(
   file: File,

frontend/src/api/client.ts

@@ -8,6 +8,16 @@
 //     and the API, so a remote device on http://<host>:<share-port> must hit
 //     that same origin — NOT a hardcoded :3900, which is cross-origin (CORS)
 //     and loopback-only/unreachable from another machine.
+// Explicit .ts extension: tests/frontend/apiClient.test.mjs loads this module
+// under `node --experimental-strip-types`, whose ESM resolver requires real
+// file extensions (tsconfig has allowImportingTsExtensions for tsc).
+import {
+  getUnacknowledgedBackendCrash,
+  describeCrashExit,
+  crashAge,
+  type BackendCrashMarker,
+} from '../utils/backendCrash.ts';
+
 const viteEnv = import.meta.env ?? {};
 // Remote-backend settings (Wave 2.3): user-configured in Settings → Sharing.
 // localStorage so the choice survives restarts; read once at module load —
@@ -143,6 +153,28 @@ export async function apiFetch(path: string, opts: RequestInit = {}): Promise<Re
         await new Promise((r) => setTimeout(r, TRANSPORT_RETRY_BACKOFF_MS[attempt]));
         continue;
       }
+      // #941: if the desktop shell recorded an unacknowledged backend crash,
+      // tell the honest story instead of the vague "can't reach" — and let
+      // BackendCrashNotice raise its "View crash details" affordance.
+      let crash: BackendCrashMarker | null = null;
+      try {
+        crash = await getUnacknowledgedBackendCrash();
+      } catch {
+        /* forensics unavailable — fall through to the generic message */
+      }
+      if (crash) {
+        try {
+          window.dispatchEvent(new CustomEvent('ov:backend-crashed', { detail: crash }));
+        } catch {
+          /* no window (tests) — the ApiError below still tells the story */
+        }
+        throw new ApiError(
+          `The local OmniVoice backend crashed (${describeCrashExit(crash)}) ${crashAge(crash)} ago ` +
+            'and is being restarted — this request could not reach it. ' +
+            'Open the crash notice for the error output, or check Settings → Logs → Backend.',
+          { status: 0, detail: lastDetail },
+        );
+      }
       throw new ApiError(
         "Can't reach the local OmniVoice backend — it may still be starting up, or it stopped. " +
           'Wait a few seconds and try again; if it persists, restart the app (or check Settings → Logs → Backend).',

frontend/src/api/dub.ts

@@ -111,6 +111,23 @@ export async function clearDubHistory(): Promise<Response> {
   return apiFetch('/dub/history', { method: 'DELETE' });
 }
 
+export interface DubTrackInfo {
+  path?: string;
+  language?: string;
+  language_code?: string;
+  duration?: number;
+  timing_strategy?: string;
+}
+
+/** Per-track metadata (duration, timing strategy, …) keyed by language code.
+ *  Backs the track-pill tooltips; the store only carries the track codes. */
+export async function dubListTracks(jobId: string): Promise<Record<string, DubTrackInfo>> {
+  const res = await apiJson<{ tracks?: Record<string, DubTrackInfo> }>(
+    `/dub/tracks/${encodeURIComponent(jobId)}`,
+  );
+  return res?.tracks || {};
+}
+
 export interface DubQCResponse {
   engine: string;
   total: number;

frontend/src/api/engines.ts

@@ -3,6 +3,7 @@ import type {
   AllEnginesResponse,
   EngineFamily,
   EngineHealthResponse,
+  EngineSelfTestResponse,
   SelectEngineResponse,
 } from './types';
 
@@ -45,8 +46,15 @@ export async function listEngines(): Promise<AllEnginesResponse> {
 export async function selectEngine(
   family: EngineFamily,
   backendId: string,
+  modelId?: string,
 ): Promise<SelectEngineResponse> {
-  return apiPost<SelectEngineResponse>('/engines/select', { family, backend_id: backendId });
+  return apiPost<SelectEngineResponse>('/engines/select', {
+    family,
+    backend_id: backendId,
+    // Only mlx-audio's curated-model picker (#981) sets this — omit
+    // entirely rather than send `undefined`/null for every other call site.
+    ...(modelId ? { model_id: modelId } : {}),
+  });
 }
 
 /**
@@ -64,6 +72,18 @@ export async function getEngineHealth(engineId: string): Promise<EngineHealthRes
   return apiJson<EngineHealthResponse>(`/engines/${encodeURIComponent(engineId)}/health`);
 }
 
+/**
+ * Run a bounded, real tiny-synthesis on an AVAILABLE, IN-PROCESS TTS engine —
+ * proves the engine actually emits audio (duration + sample-rate + samples),
+ * not just that its package imports (`is_available()` liveness). The Compat
+ * Matrix's "Self-test" button calls this; only ever on user click, never on
+ * Settings mount. 400 for a subprocess-isolated or not-available engine, 404
+ * for a non-TTS id. Never 500s on a synth failure — it lands in `ok:false`.
+ */
+export async function selfTestEngine(engineId: string): Promise<EngineSelfTestResponse> {
+  return apiPost<EngineSelfTestResponse>(`/engines/${encodeURIComponent(engineId)}/selftest`, {});
+}
+
 export async function listTranslationEngines(): Promise<TranslationEnginesResponse> {
   return apiJson<TranslationEnginesResponse>('/engines/translation');
 }

frontend/src/api/setup.ts

@@ -40,6 +40,9 @@ export interface ModelList {
   models: KnownModel[];
   total_installed_bytes: number;
   hf_cache_dir: string;
+  /** Free space on the cache volume — surfaced in the Model Store header so an
+   *  "Install all" can't silently overrun the disk. */
+  disk_free_gb?: number;
 }
 
 export async function listModels(): Promise<ModelList> {
@@ -50,6 +53,12 @@ export async function installModel(repo_id: string): Promise<{ status: string; r
   return apiPost('/models/install', { repo_id });
 }
 
+/** Request cancellation of an in-flight install (FDL-11). Best-effort: the
+ *  backend stops further retries and emits an `install_cancelled` SSE event. */
+export async function cancelInstallModel(repo_id: string): Promise<{ cancelling: string }> {
+  return apiPost('/models/install/cancel', { repo_id });
+}
+
 // ── Device-aware model recommendation ─────────────────────────────────────
 
 interface RecommendedModel {