Add comprehensive iCal properties support to event creation modal

Enhanced the create event modal to include all major iCalendar properties:
- Event status (confirmed/tentative/cancelled)
- Privacy classification (public/private/confidential)
- Priority levels (0-9 numeric scale)
- Organizer email field
- Attendees list (comma-separated emails)
- Categories (comma-separated tags)
- Reminder options (none to 1 week before)
- Recurrence patterns (none/daily/weekly/monthly/yearly)

Updated backend to parse and handle all new fields, with proper enum conversion
and comma-separated list parsing. Events now generate complete iCal data with
STATUS, CLASS, PRIORITY, ORGANIZER, ATTENDEE, CATEGORIES, VALARM, and RRULE properties.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/components/mod.rs

@@ -17,7 +17,7 @@ pub use create_calendar_modal::CreateCalendarModal;
 pub use context_menu::ContextMenu;
 pub use event_context_menu::EventContextMenu;
 pub use calendar_context_menu::CalendarContextMenu;
-pub use create_event_modal::{CreateEventModal, EventCreationData};
+pub use create_event_modal::{CreateEventModal, EventCreationData, EventStatus, EventClass, ReminderType, RecurrenceType};
 pub use sidebar::Sidebar;
 pub use calendar_list_item::CalendarListItem;
 pub use route_handler::RouteHandler;