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>;
+  };
 }

shared/voice.ts

@@ -0,0 +1,90 @@
+/** Local voice engine contract (sherpa-onnx in a utility process). Shared by main and renderer. */
+
+export type VoiceModelKind = 'stt' | 'tts';
+export type VoiceEngineKind = 'whisper' | 'sense-voice' | 'nemo-transducer' | 'kokoro' | 'piper';
+
+export interface VoiceSpeaker {
+  id: number;
+  name: string;
+  lang: string;
+}
+
+export interface VoiceModelSpec {
+  id: string;
+  kind: VoiceModelKind;
+  engine: VoiceEngineKind;
+  name: string;
+  description: string;
+  languages: string[];
+  sizeMb: number;
+  url: string;
+  /** Folder created by the archive (files are referenced relative to it). */
+  dir: string;
+  /** Files that must exist once installed. */
+  files: string[];
+  speakers?: VoiceSpeaker[];
+  sampleRate?: number;
+  recommended?: boolean;
+}
+
+export interface VoiceModelStatus extends VoiceModelSpec {
+  installed: boolean;
+  downloading: boolean;
+  installedBytes: number;
+}
+
+export interface VoiceDownloadProgress {
+  id: string;
+  phase: 'download' | 'extract' | 'done' | 'error' | 'cancelled';
+  received: number;
+  total: number;
+  percent: number;
+  message?: string;
+}
+
+export interface TranscribeRequest {
+  modelId: string;
+  wav: Uint8Array;
+  language: string; // 'fr', 'en', 'auto'
+}
+
+export interface TranscribeResult {
+  text: string;
+  language?: string;
+  durationMs: number;
+  audioSec: number;
+}
+
+export interface SynthesizeRequest {
+  modelId: string;
+  text: string;
+  speaker: number;
+  speed: number;
+}
+
+export interface SynthesizeResult {
+  wav: Uint8Array;
+  sampleRate: number;
+  durationMs: number;
+  audioSec: number;
+}
+
+export interface VoiceEngineStatus {
+  available: boolean;
+  error?: string;
+  version?: string;
+  loaded: string[];
+  modelsDir: string;
+}
+
+export const VOICE_IPC = {
+  status: 'voice:status',
+  modelsList: 'voice:models:list',
+  modelsDownload: 'voice:models:download',
+  modelsCancel: 'voice:models:cancel',
+  modelsRemove: 'voice:models:remove',
+  modelsProgress: 'voice:models:progress',
+  transcribe: 'voice:transcribe',
+  synthesize: 'voice:synthesize',
+  unload: 'voice:unload'
+} as const;