Matches JamTrack section format by adding a header showing
"Backing Track: {filename}" with a close link.
Changes:
- Added h5 header in JKSessionScreen with backing track filename
- Added close link with FontAwesome times icon
- Removed duplicate internal header from JKSessionBackingTrack component
- Now displays: "Backing Track: {shortFilename}" at the top
- Close link triggers handleBackingTrackMainClose
Format now matches JamTrack section:
- Header with name and close link
- Single track with instrument icon and mixer controls
- Consistent styling with border separator
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
281c6eba7f