On Android WebView, window.speechSynthesis.getVoices() often returns empty
because the Web Speech API cannot enumerate the device's TTS voices.
This caused the kiosk to show 'nessuna voce offline è supportata'.
Changes:
- KioskActivity.kt: initialise Android TextToSpeech engine on startup;
expose speak(text, rate, pitch), stopSpeech() and isTtsReady() via
the existing _kioskBridge JavascriptInterface; release TTS in onDestroy.
- app.js (_speakBrowser): when _kioskBridge.speak is available, delegate
to it instead of using speechSynthesis — works even without offline voice
packs installed.
- app.js (_initBrowserTtsVoices): show 'Voce nativa Android (kiosk)'
in the voice dropdown when running inside the kiosk WebView.
- app.js (testTTS): use the bridge path when testing TTS inside the kiosk.
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