- Enhanced loadJamTrack: checks sync state, triggers download if needed
- downloadJamTrack: handles download flow with progress callbacks
- checkJamTrackSync: verifies track synchronization state
- loadJMEP: loads JMEP data if available
- seekJamTrack: applies UAT-003 fix pattern for pending seek while paused
- closeJamTrack: stops playback and clears state
- All thunks use fqId format correctly
- Global callbacks set up for native client download progress
- extraReducers handle all loading states
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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