fix(desktop): make recording and dubbing reliable (#1481)

* fix(ui): keep scaled desktop shell responsive

* fix(linux): support desktop microphone capture

* fix(ui): update the centered VoiceStudio brand

* fix(audio): fall back when recorder start is unsupported

* fix(desktop): use the app header as titlebar

* feat(audio): add live microphone input controls

* fix(dub): recover from missing transcription models

* fix(dub): make pipeline stages actionable

* fix(asr): recover low-memory transcription

* docs: record desktop reliability fixes

* fix(ui): use semantic error banner border

* fix(dub): harden recovery and recording fallbacks

docs/install/troubleshooting.md

@@ -681,6 +681,14 @@ up, the shell now prints the exit code and where to look (the cargo/tauri
 output above it, plus `omnivoice.log` and `backend_err.log` in your VoiceStudio
 data folder) instead of exiting silently.
 
+If Cargo stops before the window is built with `Package gdk-3.0 was not found`,
+`pango.pc` missing, `libsoup-3.0` missing, or `javascriptcoregtk-4.1` missing,
+the Ubuntu/Debian WebKitGTK development packages are absent. Install the full
+package block in the [Linux source-build guide](linux.md#building-from-source),
+then rerun `source "$HOME/.cargo/env"` and `bun desktop`. Do not set a custom
+`PKG_CONFIG_PATH` unless the libraries were deliberately installed outside the
+system package manager.
+
 **Still stuck?** Open the details, copy the output, and file it with **Report**
 — that output is the thing that makes the failure diagnosable.