Address GitHub issue #13 (events not spanning real duration, hour label alignment)
and add five standard calendar UX features:
- Click-drag on empty time slots to create events with pre-filled time range
- Resize events by dragging bottom edge handle (15-min snap, optimistic JMAP update)
- Recurring event edit/delete scope dialog (this/following/all occurrences)
- Double-click quick create with inline title input (PT1H default)
- Event duplication button in modal (clones +1 day, opens for editing)
Shared interaction logic extracted to hooks/use-time-grid-interactions.ts.
All features include i18n (8 locales), accessibility (ARIA, pointer events),
and proper error handling with toast feedback.
Matthieu MALVACHE