- DB migration v12: add status column to mc_registrations and open_day_bookings
- MC and Open Day tabs now have full status workflow (new → contacted → confirmed/declined)
- Filter tabs with counts, status badges, action buttons matching group bookings
- Extract shared components (_shared.tsx): FilterTabs, StatusBadge, StatusActions, BookingCard, ContactLinks
- Split monolith into _McRegistrationsTab.tsx, _OpenDayBookingsTab.tsx, _shared.tsx
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
