fix(catalogue): harvest review findings on #2013

- SetupSummary: an installed engine whose routing is "unavailable" reads
  Needs setup, not Ready (select is refused for it too); a failed /engines
  or /dictation/models fetch renders as an error with Retry instead of
  posing as "Off" / "Needs setup".
- Bulk installs (summary, model store, recommendation card) wait for every
  request to settle before re-enabling, and report which repos failed —
  one early rejection can no longer re-arm the button mid-flight.
- The weights list stays mounted across family switches (hidden under LLM)
  so download progress and Retry/Dismiss state survive navigation.
- Settings search: Hugging Face mirror terms route to Network; the legacy
  "models" tab id resolves to Storage. "Manage models" opens the TTS tab.
- Locales: uk "Рушії", zh-TW "引擎", vi "Engine" for the Engines heading.
- Docs name the family tab wherever the instruction depends on it.

docs/install/macos.md

@@ -157,7 +157,7 @@ without the quarantine step.
 - **Apple Silicon (M-series):** VoiceStudio 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.
-  Installing the **Parakeet TDT v3 (MLX)** model from **Model Catalogue → Downloaded weights**
+  Installing the **Parakeet TDT v3 (MLX)** model from **Model Catalogue** (ASR tab → **Downloaded weights**)
   additionally makes dictation/capture prefer the `parakeet-mlx` engine
   (25 European languages, word timestamps, ~2 GB unified memory) — it is never
   downloaded without that explicit install, and it is only auto-preferred when