Refactors calendar configuration and event handling

Streamlines calendar configuration by adopting a singleton pattern for consistent access and simplifies event handling.

- Removes direct `CalendarConfig` dependency injection in favor of the `calendarConfig` singleton, reducing code complexity.
- Replaces specific event emissions for grid, date, and resource settings updates with a general `REFRESH_REQUESTED` event.
- Updates event names to be more descriptive and consistent ("NAVIGATION_COMPLETED", "PERIOD_INFO_UPDATE").
- Removes the need to pass the calendar config to renderers since it is now a singleton.

This improves code maintainability and simplifies the event emission process.

src/index.ts

@@ -22,7 +22,7 @@ async function initializeCalendar(): Promise<void> {
     
     // Create managers using factory pattern
     const managerFactory = ManagerFactory.getInstance();
-    const managers = managerFactory.createManagers(eventBus, config);
+    const managers = managerFactory.createManagers(eventBus);
     
     // Enable debug mode for development
     eventBus.setDebug(true);