Phase 1-5 implementation:
- Keyboard shortcuts (Space, arrows, M, L, +/-)
- Dark/Light mode with theme store
- Loop regions for practice sections
- Mobile responsive view with tabs
- Beat library with preview and use functionality
Backend:
- Add library_beats schema
- Add library beat endpoints (GET list, GET download-url, POST use)
Frontend:
- BeatLibrary component with preview player
- BeatUploader tabs (Upload/Library)
- Theme-aware waveform colors
- Compact mobile playback controls
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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