feat(voice): fully-local STT + TTS via Whisper/Piper provider factory

Cargo.toml

@@ -55,6 +55,10 @@ hmac = "0.12"
 tar = "0.4"
 xz2 = { version = "0.1", features = ["static"] }
 zip = { version = "2", default-features = false, features = ["deflate"] }
+# gzip decoder for the Piper tar.gz binary releases on macOS / Linux. Already
+# pulled in transitively by zip's `deflate` feature; declared directly so
+# the installer module can `use flate2::read::GzDecoder`.
+flate2 = "1"
 # Real timeout for `node --version` probes in the runtime resolver. Guards
 # against a broken shim on PATH hanging the bootstrap forever.
 wait-timeout = "0.2"

app/src/chat/chatSendError.ts

@@ -6,6 +6,8 @@ export type ChatSendErrorCode =
   | 'cloud_send_failed'
   | 'voice_transcription'
   | 'stt_not_ready'
+  | 'voice_synthesis'
+  | 'tts_not_ready'
   | 'microphone_unavailable'
   | 'microphone_recording'
   | 'microphone_access'

app/src/components/settings/hooks/useSettingsNavigation.ts

@@ -191,13 +191,13 @@ export const useSettingsNavigation = (): SettingsNavigationHook => {
       // Leaf panels under features
       case 'screen-intelligence':
       case 'autocomplete':
-      case 'voice':
       case 'messaging':
       case 'tools':
         return [settingsCrumb, featuresCrumb];
 
       // Leaf panels under AI & Models
       case 'local-model':
+      case 'voice':
         return [settingsCrumb, aiModelsCrumb];
 
       // Team sub-pages