- Add sessionActiveRef to track when voice session is active
- Add shouldRestartSTTRef to auto-restart STT after it ends
- STT now continues listening during TTS playback
- Voice detection callback checks both status and isSpeaking
- Final results during TTS are ignored (user interrupted)
- STT automatically restarts after ending if session is still active
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Co-Authored-By: Claude <noreply@anthropic.com>