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/core/CalendarConfig.ts

@@ -298,11 +298,10 @@ export class CalendarConfig {
       this.config.minEventDuration = updates.snapInterval;
     }
     
-    // Emit grid settings update event
+    // Grid settings changes trigger general refresh - avoid specific event
     eventBus.emit(CoreEvents.REFRESH_REQUESTED, {
       key: 'gridSettings',
-      value: this.gridSettings,
-      oldValue: this.gridSettings
+      value: this.gridSettings
     });
   }
 
@@ -319,11 +318,10 @@ export class CalendarConfig {
   updateDateViewSettings(updates: Partial<DateViewSettings>): void {
     this.dateViewSettings = { ...this.dateViewSettings, ...updates };
     
-    // Emit date view settings update event
+    // Date view settings changes trigger general refresh - avoid specific event
     eventBus.emit(CoreEvents.REFRESH_REQUESTED, {
       key: 'dateViewSettings',
-      value: this.dateViewSettings,
-      oldValue: this.dateViewSettings
+      value: this.dateViewSettings
     });
   }
 
@@ -340,11 +338,10 @@ export class CalendarConfig {
   updateResourceViewSettings(updates: Partial<ResourceViewSettings>): void {
     this.resourceViewSettings = { ...this.resourceViewSettings, ...updates };
     
-    // Emit resource view settings update event
+    // Resource view settings changes trigger general refresh - avoid specific event
     eventBus.emit(CoreEvents.REFRESH_REQUESTED, {
       key: 'resourceViewSettings',
-      value: this.resourceViewSettings,
-      oldValue: this.resourceViewSettings
+      value: this.resourceViewSettings
     });
   }