Creates all-day container in header renderer

Ensures all-day container is created as part of the standard header structure, rather than on-demand.

Removes the request listener and logic for ensuring all-day container existence.

src/managers/HeaderManager.ts

@@ -24,9 +24,6 @@ export class HeaderManager {
     
     // Listen for navigation events to update header
     this.setupNavigationListener();
-    
-    // Listen for requests to ensure all-day container
-    this.setupContainerRequestListener();
   }
 
   /**
@@ -60,9 +57,6 @@ export class HeaderManager {
       });
       
       if (targetDate) {
-        // Ensure all-day container exists
-        this.ensureAllDayContainer();
-        
         const calendarType = calendarConfig.getCalendarMode();
         const headerRenderer = CalendarTypeFactory.getHeaderRenderer(calendarType);
         
@@ -94,27 +88,6 @@ export class HeaderManager {
     console.log('✅ HeaderManager: Drag event listeners attached');
   }
 
-  /**
-   * Ensure all-day container exists in header - creates directly
-   */
-  private ensureAllDayContainer(): HTMLElement | null {
-    const calendarHeader = this.getCalendarHeader();
-    if (!calendarHeader) return null;
-    
-    let allDayContainer = calendarHeader.querySelector('swp-allday-container') as HTMLElement;
-    
-    if (!allDayContainer) {
-      console.log('📍 HeaderManager: Creating all-day container directly...');
-      allDayContainer = document.createElement('swp-allday-container');
-      calendarHeader.appendChild(allDayContainer);
-    
-      console.log('✅ HeaderManager: All-day container created');
-    }
-    
-    return allDayContainer;
-  }
-
-
   /**
    * Setup navigation event listener
    */
@@ -138,16 +111,6 @@ export class HeaderManager {
 
   }
 
-  /**
-   * Setup listener for all-day container creation requests
-   */
-  private setupContainerRequestListener(): void {
-    eventBus.on('header:ensure-allday-container', () => {
-      console.log('📍 HeaderManager: Received request to ensure all-day container');
-      this.ensureAllDayContainer();
-    });
-  }
-
   /**
    * Update header content for navigation
    */

src/renderers/HeaderRenderer.ts

@@ -30,6 +30,10 @@ export class DateHeaderRenderer implements HeaderRenderer {
   render(calendarHeader: HTMLElement, context: HeaderRenderContext): void {
     const { currentWeek, config } = context;
     
+    // FIRST: Always create all-day container as part of standard header structure
+    const allDayContainer = document.createElement('swp-allday-container');
+    calendarHeader.appendChild(allDayContainer);
+    
     // Initialize date calculator with config
     DateCalculator.initialize(config);
     this.dateCalculator = new DateCalculator();