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/renderers/NavigationRenderer.ts

@@ -26,7 +26,7 @@ export class NavigationRenderer {
    * Setup event listeners for DOM updates
    */
   private setupEventListeners(): void {
-    this.eventBus.on(CoreEvents.WEEK_INFO_UPDATED, (event: Event) => {
+    this.eventBus.on(CoreEvents.WEEK_CHANGED, (event: Event) => {
       const customEvent = event as CustomEvent;
       const { weekNumber, dateRange } = customEvent.detail;
       this.updateWeekInfoInDOM(weekNumber, dateRange);
@@ -83,14 +83,16 @@ export class NavigationRenderer {
     console.log('2. Rendering headers and columns...');
     this.renderWeekContentInContainer(newGrid, weekStart);
     
-    console.log('3. Pre-rendering events synchronously...');
-    this.eventRenderer.renderEvents({
-      container: newGrid,
+    console.log('3. Emitting GRID_RENDERED for navigation container...');
+    this.eventBus.emit(CoreEvents.GRID_RENDERED, {
+      container: newGrid,  // Specific grid container, not parent
+      currentDate: weekStart,
       startDate: weekStart,
-      endDate: weekEnd
+      endDate: weekEnd,
+      isNavigation: true  // Flag to indicate this is navigation rendering
     });
     
-    console.log('✅ Container ready with pre-rendered events');
+    console.log('✅ Container ready with GRID_RENDERED event emitted');
     console.groupEnd();
     return newGrid;
   }