Refactors event rendering and display

Improves event rendering by introducing dedicated event
renderers and streamlining event display logic.

- Adds a base event renderer and specialized date and
  resource-based renderers to handle event display logic.
- Renders all-day events within a dedicated container in the
  calendar header.
- Removes the direct filtering of all-day events from the
  `GridManager`.
- Fixes an issue where the 'Summer Festival' event started on the
  wrong date.

The changes enhance the flexibility and maintainability of the
calendar, provide dedicated containers and styling for allday events and fix date issues related to certain events

src/managers/GridManager.ts

@@ -7,7 +7,6 @@ import { eventBus } from '../core/EventBus';
 import { calendarConfig } from '../core/CalendarConfig';
 import { CoreEvents } from '../constants/CoreEvents';
 import { ResourceCalendarData, CalendarView } from '../types/CalendarTypes';
-import { AllDayEvent } from '../types/EventTypes';
 import { ViewStrategy, ViewContext } from '../strategies/ViewStrategy';
 import { WeekViewStrategy } from '../strategies/WeekViewStrategy';
 import { MonthViewStrategy } from '../strategies/MonthViewStrategy';
@@ -18,7 +17,6 @@ import { MonthViewStrategy } from '../strategies/MonthViewStrategy';
 export class GridManager {
   private container: HTMLElement | null = null;
   private currentDate: Date = new Date();
-  private allDayEvents: AllDayEvent[] = [];
   private resourceData: ResourceCalendarData | null = null;
   private currentStrategy: ViewStrategy;
   private eventCleanup: (() => void)[] = [];
@@ -53,15 +51,6 @@ export class GridManager {
       })
     );
     
-    // Listen for data changes
-    
-    this.eventCleanup.push(
-      eventBus.on(CoreEvents.DATA_LOADED, (e: Event) => {
-        const detail = (e as CustomEvent).detail;
-        this.updateAllDayEvents(detail.events);
-      })
-    );
-    
     // Listen for config changes that affect rendering
     this.eventCleanup.push(
       eventBus.on(CoreEvents.REFRESH_REQUESTED, (e: Event) => {
@@ -127,7 +116,6 @@ export class GridManager {
     const context: ViewContext = {
       currentDate: this.currentDate,
       container: this.container,
-      allDayEvents: this.allDayEvents,
       resourceData: this.resourceData
     };
     
@@ -155,14 +143,6 @@ export class GridManager {
     console.log(`✅ Grid rendered with ${layoutConfig.columnCount} columns`);
   }
   
-  /**
-   * Update all-day events and re-render
-   */
-  private updateAllDayEvents(events: AllDayEvent[]): void {
-    console.log(`GridManager: Updating ${events.length} all-day events`);
-    this.allDayEvents = events.filter(event => event.allDay);
-    this.render();
-  }
   
   /**
    * Get current period label from strategy
@@ -239,7 +219,6 @@ export class GridManager {
     
     // Clear references
     this.container = null;
-    this.allDayEvents = [];
     this.resourceData = null;
   }
 }