Fix and improve scheduling

• Fix scheduling for all AKs that don't have a room yet
• Color code categories in track manager

changed milestone to %KIF 52,0

requested review from @ngeisler

added 6 commits

• fc506a75...f133e2b8 - 4 commits from branch main
• 45a76ff1 - Fix scheduling for AKs that don't have a room yet
• fbcf3a62 - Color code categories in track manager

Compare with previous version

approved this merge request

merged

mentioned in commit 40be361d