Refactors event handling and grid rendering

Improves calendar performance and data flow by streamlining event emissions and grid rendering logic.

- Replaces generic CONFIG_UPDATE events with REFRESH_REQUESTED
  for more specific refresh triggers.
- Removes redundant grid re-renders on DATE_CHANGED and
  WEEK_CHANGED events, delegating navigation to NavigationManager.
- Introduces VIEW_CHANGED and DATE_CHANGED events for calendar
  mode and date selection, respectively.
- NavigationManager now handles date validation.
- Moves rendering logic from NavigationManager to NavigationRenderer.
- Syncs scroll position based on PERIOD_CHANGED instead of
  NAVIGATION_ANIMATION_COMPLETE.

This change optimizes the calendar's responsiveness and reduces
unnecessary re-renders, leading to a smoother user experience.

src/core/CalendarConfig.ts

@@ -215,7 +215,7 @@ export class CalendarConfig {
     // Update computed values handled in specific update methods
 
     // Emit config update event
-    eventBus.emit(CoreEvents.CONFIG_UPDATE, {
+    eventBus.emit(CoreEvents.REFRESH_REQUESTED, {
       key,
       value,
       oldValue
@@ -292,7 +292,7 @@ export class CalendarConfig {
     }
     
     // Emit grid settings update event
-    eventBus.emit(CoreEvents.CONFIG_UPDATE, {
+    eventBus.emit(CoreEvents.REFRESH_REQUESTED, {
       key: 'gridSettings',
       value: this.gridSettings,
       oldValue: this.gridSettings
@@ -320,7 +320,7 @@ export class CalendarConfig {
     this.dateViewSettings = { ...this.dateViewSettings, ...updates };
     
     // Emit date view settings update event
-    eventBus.emit(CoreEvents.CONFIG_UPDATE, {
+    eventBus.emit(CoreEvents.REFRESH_REQUESTED, {
       key: 'dateViewSettings',
       value: this.dateViewSettings,
       oldValue: this.dateViewSettings
@@ -355,7 +355,7 @@ export class CalendarConfig {
     this.resourceViewSettings = { ...this.resourceViewSettings, ...updates };
     
     // Emit resource view settings update event
-    eventBus.emit(CoreEvents.CONFIG_UPDATE, {
+    eventBus.emit(CoreEvents.REFRESH_REQUESTED, {
       key: 'resourceViewSettings',
       value: this.resourceViewSettings,
       oldValue: this.resourceViewSettings
@@ -409,7 +409,7 @@ export class CalendarConfig {
     this.calendarMode = mode;
     
     // Emit calendar mode change event
-    eventBus.emit(CoreEvents.CALENDAR_TYPE_CHANGED, {
+    eventBus.emit(CoreEvents.VIEW_CHANGED, {
       oldType: oldMode,
       newType: mode
     });
@@ -429,7 +429,7 @@ export class CalendarConfig {
     this.selectedDate = date;
     
     // Emit date change event
-    eventBus.emit(CoreEvents.SELECTED_DATE_CHANGED, {
+    eventBus.emit(CoreEvents.DATE_CHANGED, {
       date: date
     });
   }