Refactors all-day event rendering and DOM access

Decouples all-day event rendering, making it reactive to header readiness with period data.
Eliminates explicit DOM element caching, simplifying element access.
Enhances the `header:ready` event payload with `startDate` and `endDate`.
Improves all-day row height animation and calculation.

src/managers/AllDayManager.ts

@@ -16,9 +16,6 @@ import {
  * Separated from HeaderManager for clean responsibility separation
  */
 export class AllDayManager {
-  private cachedAllDayContainer: HTMLElement | null = null;
-  private cachedCalendarHeader: HTMLElement | null = null;
-  private cachedHeaderSpacer: HTMLElement | null = null;
   private allDayEventRenderer: AllDayEventRenderer;
 
   constructor() {
@@ -40,12 +37,12 @@ export class AllDayManager {
         originalElementId: originalElement?.dataset?.eventId,
         originalElementTag: originalElement?.tagName
       });
-      
+
       if (targetDate && cloneElement) {
         this.handleConvertToAllDay(targetDate, cloneElement);
       }
 
-      this.checkAndAnimateAllDayHeight ();
+      this.checkAndAnimateAllDayHeight();
     });
 
     eventBus.on('drag:mouseleave-header', (event) => {
@@ -59,7 +56,7 @@ export class AllDayManager {
         this.handleConvertFromAllDay(cloneElement);
       }
 
-      this.checkAndAnimateAllDayHeight ();
+      this.checkAndAnimateAllDayHeight();
 
     });
 
@@ -111,12 +108,12 @@ export class AllDayManager {
     // Listen for drag cancellation to recalculate height
     eventBus.on('drag:cancelled', (event) => {
       const { draggedElement, reason } = (event as CustomEvent).detail;
-      
+
       console.log('🚫 AllDayManager: Drag cancelled', {
         eventId: draggedElement?.dataset?.eventId,
         reason
       });
-      
+
       // Recalculate all-day height since clones may have been removed
       this.checkAndAnimateAllDayHeight();
     });
@@ -128,37 +125,17 @@ export class AllDayManager {
     });
   }
 
-  /**
-   * Get cached all-day container element
-   */
+
   private getAllDayContainer(): HTMLElement | null {
-    if (!this.cachedAllDayContainer) {
-      const calendarHeader = this.getCalendarHeader();
-      if (calendarHeader) {
-        this.cachedAllDayContainer = calendarHeader.querySelector('swp-allday-container');
-      }
-    }
-    return this.cachedAllDayContainer;
+    return document.querySelector('swp-calendar-header swp-allday-container');
   }
 
-  /**
-   * Get cached calendar header element
-   */
   private getCalendarHeader(): HTMLElement | null {
-    if (!this.cachedCalendarHeader) {
-      this.cachedCalendarHeader = document.querySelector('swp-calendar-header');
-    }
-    return this.cachedCalendarHeader;
+    return document.querySelector('swp-calendar-header');
   }
 
-  /**
-   * Get cached header spacer element
-   */
   private getHeaderSpacer(): HTMLElement | null {
-    if (!this.cachedHeaderSpacer) {
-      this.cachedHeaderSpacer = document.querySelector('swp-header-spacer');
-    }
-    return this.cachedHeaderSpacer;
+    return document.querySelector('swp-header-spacer');
   }
 
   /**
@@ -177,15 +154,6 @@ export class AllDayManager {
     return { targetHeight, currentHeight, heightDifference };
   }
 
-  /**
-   * Clear cached DOM elements (call when DOM structure changes)
-   */
-  private clearCache(): void {
-    this.cachedCalendarHeader = null;
-    this.cachedAllDayContainer = null;
-    this.cachedHeaderSpacer = null;
-  }
-
   /**
    * Collapse all-day row when no events
    */
@@ -198,7 +166,10 @@ export class AllDayManager {
    */
   public checkAndAnimateAllDayHeight(): void {
     const container = this.getAllDayContainer();
-    if (!container) return;
+    if (!container) {
+      this.animateToRows(0);
+      return;
+    }
 
     const allDayEvents = container.querySelectorAll('swp-event');
 
@@ -208,15 +179,15 @@ export class AllDayManager {
     if (allDayEvents.length > 0) {
       // Track which rows are actually used by checking grid positions
       const usedRows = new Set<number>();
-      
+
       (Array.from(allDayEvents) as HTMLElement[]).forEach((event: HTMLElement) => {
         const gridRow = parseInt(getComputedStyle(event).gridRowStart) || 1;
         usedRows.add(gridRow);
       });
-      
+
       // Max rows = highest row number in use
       maxRows = usedRows.size > 0 ? Math.max(...usedRows) : 0;
-      
+
       console.log('🔍 AllDayManager: Height calculation', {
         totalEvents: allDayEvents.length,
         usedRows: Array.from(usedRows).sort(),
@@ -254,7 +225,7 @@ export class AllDayManager {
         { height: `${currentParentHeight}px` },
         { height: `${targetParentHeight}px` }
       ], {
-        duration: 300,
+        duration: 150,
         easing: 'ease-out',
         fill: 'forwards'
       })
@@ -464,7 +435,7 @@ export class AllDayManager {
    * Handle drag end for all-day events
    */
   private handleDragEnd(originalElement: HTMLElement, dragClone: HTMLElement, finalPosition: any): void {
- 
+
     // Normalize clone
     const cloneId = dragClone.dataset.eventId;
     if (cloneId?.startsWith('clone-')) {
@@ -484,12 +455,4 @@ export class AllDayManager {
       finalColumn: dragClone.style.gridColumn
     });
   }
-
-
-  /**
-   * Clean up cached elements and resources
-   */
-  public destroy(): void {
-    this.clearCache();
-  }
 }