- Add onVoiceDetected callback to useSpeechRecognition hook
- Triggered on first interim result (voice activity detected)
- Uses voiceDetectedRef to ensure callback fires only once per session
- Reset flag on session start/end
- Connect STT to VoiceContext in _layout.tsx
- Use useSpeechRecognition with onVoiceDetected callback
- Call interruptIfSpeaking() when voice detected during 'speaking' state
- Forward STT results to VoiceContext (setTranscript, sendTranscript)
- Start/stop STT based on isListening state
- Export interruptIfSpeaking from VoiceContext provider
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Co-Authored-By: Claude <noreply@anthropic.com>