Refactors event rendering to be event-driven

Moves event rendering logic into a dedicated EventRenderer class that uses a strategy pattern for different calendar types.

The rendering is now triggered by `GRID_RENDERED` and `CONTAINER_READY_FOR_EVENTS` events, emitted by the GridManager and NavigationManager respectively.

This change decouples the CalendarManager from direct event rendering and allows for more flexible and efficient event updates. The EventManager now has a method to fetch events for a given time period.

Removes direct calls to event rendering from CalendarManager. Improves animation transitions by using pre-rendered containers in the NavigationManager.

src/managers/GridManager.ts

@@ -140,6 +140,16 @@ export class GridManager {
     
     const columnCount = this.getColumnCount();
     console.log(`GridManager: Render complete - created ${columnCount} columns`);
+    
+    // Emit GRID_RENDERED event to trigger event rendering
+    const weekEnd = this.currentWeek ? new Date(this.currentWeek.getTime() + 6 * 24 * 60 * 60 * 1000) : null;
+    eventBus.emit(EventTypes.GRID_RENDERED, {
+      container: this.grid,
+      currentWeek: this.currentWeek,
+      startDate: this.currentWeek,
+      endDate: weekEnd,
+      columnCount: columnCount
+    });
   }
 
   /**