v15: Fix TTS preview + Browser Whisper preload with extensive debugging
BREAKING FIXES:
- TTS Preview: Added event.preventDefault(), console logging, proper init check
- Browser Whisper: Complete console logging pipeline, error handling, progress tracking
- Voice Preferences: DOMContentLoaded fallback, explicit button click handlers
- Whisper Worker: Console logs at every step, better error messages
Debugging Features:
- Console logs show: button clicks, init events, progress updates, errors
- Progress tracking: [WhisperWorker] Progress: model.bin 47%
- Error messages: Specific failure reasons (not generic failures)
- Timeout warnings: 30s check for stuck downloads
Audio Backup Confirmed:
- Deletes immediately on successful transcription (line 621-624 app.js)
- NOT after 24 hours - 24h is server retention limit for failed transcriptions
- User was correct - this is working as designed
How to Debug:
1. Open DevTools → Console (F12)
2. Click button
3. Watch for [VoicePrefs] or [BrowserWhisper] logs
4. Check Network tab for actual downloads
5. Report what you see in console
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