Improves all-day event rendering and handling

Refactors all-day event container handling to improve rendering and event delegation.

Ensures all-day containers are consistently created and managed,
preventing issues with event display and drag-and-drop functionality.

Moves event listener setup into dedicated methods for better
organization and reusability.

src/strategies/MonthViewStrategy.ts

@@ -50,8 +50,8 @@ export class MonthViewStrategy implements ViewStrategy {
     // Add 6 weeks of day cells
     this.createDayCells(monthGrid, context.currentDate);
     
-    // Render events in day cells
-    this.renderMonthEvents(monthGrid, context.allDayEvents);
+    // Render events in day cells (will be handled by EventRendererManager)
+    // this.renderMonthEvents(monthGrid, context.allDayEvents);
     
     context.container.appendChild(monthGrid);
   }