Added complete loop functionality with UI controls:
- Loop state management in useMultiTrackPlayer (loopEnabled, loopStart, loopEnd)
- Automatic restart from loop start when reaching loop end during playback
- Loop toggle button in PlaybackControls with Repeat icon
- Loop points UI showing when loop is enabled (similar to punch in/out)
- Manual loop point adjustment with number inputs
- Quick set buttons to set loop points to current time
- Wired loop functionality through AudioEditor component
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Sebastian Krüger
a47bf09a32