Added recording capabilities to the multi-track editor:
- useRecording hook with MediaRecorder API integration
- Audio input device enumeration and selection
- Microphone permission handling
- Input level monitoring with RMS calculation
- InputLevelMeter component with visual feedback
- Record-enable button per track with pulsing indicator
- Real-time input level display when recording
Recording infrastructure is complete. Next: integrate into AudioEditor
for global recording control and buffer storage.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>