feat: local offline voice models (sherpa-onnx) with model manager and wake word (v2.1.0)

- electron/voice: model catalog (Whisper base/small/turbo, SenseVoice, Kokoro v1.0,
  Piper fr), streaming tar.bz2 downloader with progress, sherpa-onnx worker running in
  an Electron utilityProcess (transcribe / synthesize / status / unload), IPC + bridge.
- Renderer: 'local' providers for STT and TTS, Settings → Modèles locaux (download,
  progress, delete, activate), speaker selection, hands-free wake word with a tolerant
  matcher (accents, punctuation, edit distance) and attention window after a bare wake word.
- Packaging: native addon and worker unpacked from the asar; release 2.1.0.

Validated on Linux: Kokoro (fr) → Whisper base round trip, Piper (fr) → Whisper round trip.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017Wn5VX9HNbJ7N54hR24u9Y

shared/bridge.ts

@@ -11,6 +11,15 @@ import type {
   WebhookStatus,
   WindowMode
 } from './ipc';
+import type {
+  SynthesizeRequest,
+  SynthesizeResult,
+  TranscribeRequest,
+  TranscribeResult,
+  VoiceDownloadProgress,
+  VoiceEngineStatus,
+  VoiceModelStatus
+} from './voice';
 
 export type Unsubscribe = () => void;
 
@@ -51,4 +60,15 @@ export interface EveFlowBridge {
   hotkeys: {
     on: (cb: (event: HotkeyEvent) => void) => Unsubscribe;
   };
+  voice: {
+    status: () => Promise<VoiceEngineStatus>;
+    listModels: () => Promise<VoiceModelStatus[]>;
+    downloadModel: (id: string) => Promise<VoiceModelStatus>;
+    cancelDownload: (id: string) => Promise<boolean>;
+    removeModel: (id: string) => Promise<VoiceModelStatus[]>;
+    onProgress: (cb: (progress: VoiceDownloadProgress) => void) => Unsubscribe;
+    transcribe: (req: TranscribeRequest) => Promise<TranscribeResult>;
+    synthesize: (req: SynthesizeRequest) => Promise<SynthesizeResult>;
+    unload: (id?: string) => Promise<unknown>;
+  };
 }