# Change: Add Real-time Streaming Transcription

## Why
Current transcription workflow requires users to stop recording before seeing results. Users cannot edit transcription errors, and output lacks punctuation. For meeting scenarios, real-time feedback with editable text is essential for immediate correction and context awareness.

## What Changes
- **Sidecar**: Implement streaming VAD-based transcription with sentence segmentation
- **IPC**: Add continuous audio streaming from renderer to main process to sidecar
- **Frontend**: Make transcript editable with real-time segment updates
- **Punctuation**: Enable Whisper's word timestamps and add sentence boundary detection

## Impact
- Affected specs: `transcription` (new), `frontend-transcript` (new)
- Affected code:
  - `sidecar/transcriber.py` - Add streaming mode with VAD
  - `client/src/main.js` - Add audio streaming IPC handlers
  - `client/src/preload.js` - Expose streaming APIs
  - `client/src/pages/meeting-detail.html` - Editable transcript component

## Success Criteria
1. User sees text appearing within 2-3 seconds of speaking
2. Each segment is individually editable
3. Output includes punctuation (。，？！)
4. Recording can continue while user edits previous segments