test(03-05): add failing tests for EventForm modal component
- Fields: title, all-day toggle, start/end date/time, recurrence, location, description
- D-02: calendar picker absent with 1 calendar, present with 2 calendars
- Validation: empty title shows error, end-before-start shows error
- Create mode calls createEvent mutation; edit mode calls updateEvent mutation
- Escape and backdrop close the form; Cancel button closes
- role=dialog aria-modal=true; edit mode pre-populates title from TanStack cache
Lucas Berger
df416a45f1