feat: refactor to multi-track only editor with sidebar controls
Major refactor to simplify the editor and focus exclusively on multi-track editing: **AudioEditor Changes:** - Removed single-file waveform view and useAudioPlayer - Removed all single-file editing operations (cut, copy, paste, trim) - Simplified to multi-track only with track selection support - Added selectedTrackId state for track-specific effect chain - Reduced from ~1500 lines to ~290 lines **SidePanel Changes:** - Complete rewrite with 2 tabs: Tracks and Effect Chain - Tracks tab shows all tracks with inline controls (volume, pan, solo, mute) - Click tracks to select/deselect - Effect Chain tab shows effects for selected track - Removed old file/history/info/effects tabs - Sidebar now wider (320px) to accommodate inline track controls **TrackList/Track Changes:** - Added track selection support (isSelected/onSelect props) - Visual feedback with ring border when track is selected - Click anywhere on track to select it **Workflow:** 1. Import or add audio tracks 2. Select a track in the sidebar or main view 3. Apply effects to selected track via Effect Chain tab 4. Adjust track controls (volume, pan, solo, mute) in Tracks tab 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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