Queue panel:
- Double-clicking an upcoming track skips to it immediately: drops all
tracks before it from the queue and starts playback (skipToUpcoming)
- Items can be dragged to reorder; rowsMoved rebuilds the queue via
setUpcomingOrder()
- Track JSON stored per-item so order survives drag operations
- New PlayQueue methods: skipToUpcoming(), setUpcomingOrder()
- New QueuePanel signal: skipToTrackRequested(qint64) wired to MainWindow
Remove visualizer:
- Drop VisualizerWidget, Qt6::OpenGLWidgets, projectM CMake detection
- Remove qobuz_backend_read_pcm FFI (Rust + C header + Qt wrapper)
- Remove pcm_visualizer from PlayerStatus and PCM tap from AudioOutput
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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