_speakBrowser: voice fallback now prefers localService=true (offline)
voices over cloud voices. On Android Chrome, cloud voices fail silently
when no internet. New priority: local Italian → any Italian → local
any-lang → first available → lang-only.
testTTS (browser engine):
- Plays _playCookingTimerSound('done') beep FIRST (AudioContext, always
works) so user can confirm audio hardware/volume is working
- Checks if only cloud voices exist → shows actionable error
- Builds utterance with onerror → shows error code on failure
- Adds onstart → shows actual voice name/lang/online status on success
- 2s watchdog: if onstart never fires → 'nessuna risposta' warning
- Shows '🔊 Beep + TTS in corso...' during the test
dadaloop82
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