Optimizes animation speed and event flow

Reduces the duration of a UI height animation for a snappier feel.
Disables a specific `header:ready` event emission during navigation rendering.

src/managers/NavigationManager.ts

@@ -270,6 +270,29 @@ export class NavigationManager {
       newGrid.style.position = 'relative';
       newGrid.removeAttribute('data-prerendered');
       
+      // Reset all-day height and remove hardcoded header height after slide animation
+      const root = document.documentElement;
+      root.style.setProperty('--all-day-row-height', '0px');
+      
+      const header = newGrid.querySelector('swp-calendar-header') as HTMLElement;
+      if (header) {
+          // Remove the hardcoded 0px height
+          header.style.height = '';
+          header.style.height
+          // NOW emit header:ready for this specific container
+          const weekEnd = DateCalculator.addDays(targetWeek, 6);
+          this.eventBus.emit('header:ready', {
+              headerElement: header,
+              startDate: targetWeek,
+              endDate: weekEnd,
+              isNavigation: true
+          });
+          
+          console.log('🎯 NavigationManager: Animation complete, emitted header:ready', {
+              weekStart: targetWeek.toISOString()
+          });
+      }
+      
       // Clear cache since DOM structure changed
       this.clearCache();