Refactor create_event_modal into modular components

- Split massive 27K line modal into focused components
- Created event_form module with 6 tab components:
  * BasicDetailsTab - main event info with recurrence options properly positioned
  * AdvancedTab - status, privacy, priority
  * PeopleTab - organizer and attendees
  * CategoriesTab - event categories
  * LocationTab - location information
  * RemindersTab - reminder settings
- Added shared types and data structures
- Created new CreateEventModalV2 using modular architecture
- Recurrence options now positioned directly after repeat/reminder pickers

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

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

frontend/src/components/event_form/mod.rs

@@ -0,0 +1,16 @@
+// Event form components module
+pub mod types;
+pub mod basic_details;
+pub mod advanced;
+pub mod people;
+pub mod categories;
+pub mod location;
+pub mod reminders;
+
+pub use types::*;
+pub use basic_details::BasicDetailsTab;
+pub use advanced::AdvancedTab;
+pub use people::PeopleTab;
+pub use categories::CategoriesTab;
+pub use location::LocationTab;
+pub use reminders::RemindersTab;