Add AudioWorklet-based PCM16 streaming to VoiceRecorder with WebSocket
connection for near-real-time transcription. Segments appear as finalized
text that never shifts. Add speaker diarization button on audio notes
with color-coded speaker labels. Graceful fallback to batch transcription
when WebSocket unavailable.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
