feat: add TTS voice picker to voice mode bottom sheet

dashboard/frontend/src/lib/voice.js

@@ -19,6 +19,8 @@ export class VoiceSession {
     this.voiceMode = false;
     this.transcript = "";
     this.talkMode = "auto";
+    this.voices = [];
+    this.voiceIdx = -1;
     this.term = null;
     this.ws = null;
     this._lastLine = 0;
@@ -32,6 +34,22 @@ export class VoiceSession {
   get lang() { return LANGS[this.langIdx]; }
   get langLabel() { return LANG_LABELS[this.langIdx]; }
   get modeLabel() { return MODE_LABELS[this.talkMode]; }
+  get voiceName() { return this.voices[this.voiceIdx]?.name || "Default"; }
+
+  loadVoices() {
+    const all = speechSynthesis.getVoices();
+    const prefix = this.lang.split("-")[0];
+    this.voices = all.filter(v => v.lang.startsWith(prefix));
+    // Try to keep current selection
+    if (this.voiceIdx >= this.voices.length) this.voiceIdx = 0;
+    if (!this.voices.length) this.voiceIdx = -1;
+    this._notify();
+  }
+
+  setVoice(idx) {
+    this.voiceIdx = idx;
+    this._notify();
+  }
 
   attach(term, ws) {
     this.term = term;
@@ -50,6 +68,8 @@ export class VoiceSession {
       speechSynthesis.speak(new SpeechSynthesisUtterance(""));
       this._ttsUnlocked = true;
     }
+    this.loadVoices();
+    speechSynthesis.onvoiceschanged = () => this.loadVoices();
     if (this.term) {
       this._lastLine = this.term.buffer.active.baseY + this.term.buffer.active.cursorY;
     }
@@ -193,9 +213,7 @@ export class VoiceSession {
     speechSynthesis.cancel();
     const u = new SpeechSynthesisUtterance(text);
     u.lang = this.lang;
-    const voices = speechSynthesis.getVoices();
-    const v = voices.find(v => v.lang.startsWith(this.lang.split("-")[0]));
-    if (v) u.voice = v;
+    if (this.voices[this.voiceIdx]) u.voice = this.voices[this.voiceIdx];
     u.onstart = () => { this.speaking = true; this._notify(); };
     u.onend = () => { this.speaking = false; this._notify(); };
     u.onerror = () => { this.speaking = false; this._notify(); };
@@ -215,6 +233,7 @@ export class VoiceSession {
 
   cycleLang() {
     this.langIdx = (this.langIdx + 1) % LANGS.length;
+    this.loadVoices();
     if (this.listening) {
       const wasContinuous = this._recog?.continuous;
       this._stopSTT();