New features:
- Waitlist manager with promote/cancel actions
- Group transfer (move participant between groups)
- Quick attendance marking (mobile-friendly trainer view)
- Participant CSV import with preview and validation
- User profile page with password change
- Daily financial report (printable)
- Reconcile group counts command
- Deactivate expired enrollments command
- Overdue invoice reminders (2x weekly)
- Sidebar navigation updates (waitlist, transfer, quick attendance, import)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>