Now that useMixerHelper properly exposes backingTracks, we can:
- Revert the loading state workaround
- Restore original conditional requiring both showBackingTrackPlayer
and mixerHelper.backingTracks
- Remove debug console.log statements
The backing track section now waits for both conditions:
1. Player popup is open (showBackingTrackPlayer)
2. WebSocket data has arrived (mixerHelper.backingTracks)
This provides a cleaner implementation without loading placeholders.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>