Restructure the festival hierarchy end-to-end:
Seeder: Remove duplicate festival-level VOLUNTEER time slots, keep only CREW
operational slots. Rename sub-events to "Dag 1/2/3 — ..." pattern. Change
Nachtsecurity to Security (cross_event). EHBO/Security shifts now use sub-event
time slots via cross_event exception. Add flat event "Braderie Dorpstown 2026".
API: Add ?include_children=true to TimeSlotController for festivals, returning
all sub-event time slots with source and event_name fields. Update
StoreShiftRequest and UpdateShiftRequest to accept child time slots for
cross_event sections.
Frontend: Create useTimeSlotDropdown composable with 4-scenario dropdown logic.
Replace AppSelect with VAutocomplete in CreateShiftDialog with grouped items,
dimmed festival slots, and info tooltips. Add InfoTooltip reusable component.
Show festival context labels on cross_event sections in sub-event section lists.
Add read-only festival time slots on sub-event time-slots page. Add cross_event
context banner with "Bekijk alle diensten" link.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
