Implement calendar context menu with event creation modal

- Add CalendarContextMenu component for right-click on calendar days
- Add CreateEventModal component with comprehensive event creation form
- Integrate context menu detection to avoid conflicts between event/calendar menus
- Add form validation and date/time selection with all-day toggle
- Connect modal through component hierarchy from app to calendar

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

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

src/components/mod.rs

@@ -4,6 +4,8 @@ pub mod event_modal;
 pub mod create_calendar_modal;
 pub mod context_menu;
 pub mod event_context_menu;
+pub mod calendar_context_menu;
+pub mod create_event_modal;
 pub mod sidebar;
 pub mod calendar_list_item;
 pub mod route_handler;
@@ -14,6 +16,8 @@ pub use event_modal::EventModal;
 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 sidebar::Sidebar;
 pub use calendar_list_item::CalendarListItem;
 pub use route_handler::RouteHandler;