Refactors header and scroll management logic

Updates ScrollManager to dynamically sync header spacer height using ResizeObserver

Removes explicit spacer animation from HeaderDrawerManager
Simplifies header and scroll interaction by moving height synchronization logic to ScrollManager

src/v2/core/HeaderDrawerManager.ts

@@ -1,13 +1,13 @@
 export class HeaderDrawerManager {
   private drawer!: HTMLElement;
-  private spacer!: HTMLElement;
   private expanded = false;
   private readonly expandedHeight = 24;
   private readonly duration = 200;
 
   init(container: HTMLElement): void {
     this.drawer = container.querySelector('swp-header-drawer')!;
-    this.spacer = container.querySelector('swp-header-spacer')!;
+
+    if (!this.drawer) console.error('HeaderDrawerManager: swp-header-drawer not found');
   }
 
   toggle(): void {
@@ -37,8 +37,8 @@ export class HeaderDrawerManager {
       fill: 'forwards'
     };
 
+    // Kun animér drawer - ScrollManager synkroniserer header-spacer via ResizeObserver
     this.drawer.animate(keyframes, options);
-    this.spacer.animate(keyframes, options);
   }
 
   isExpanded(): boolean {

src/v2/core/ScrollManager.ts

@@ -2,13 +2,29 @@ export class ScrollManager {
   private scrollableContent!: HTMLElement;
   private timeAxisContent!: HTMLElement;
   private calendarHeader!: HTMLElement;
+  private headerViewport!: HTMLElement;
+  private headerSpacer!: HTMLElement;
+  private resizeObserver!: ResizeObserver;
 
   init(container: HTMLElement): void {
     this.scrollableContent = container.querySelector('swp-scrollable-content')!;
     this.timeAxisContent = container.querySelector('swp-time-axis-content')!;
     this.calendarHeader = container.querySelector('swp-calendar-header')!;
+    this.headerViewport = container.querySelector('swp-header-viewport')!;
+    this.headerSpacer = container.querySelector('swp-header-spacer')!;
 
     this.scrollableContent.addEventListener('scroll', () => this.onScroll());
+
+    // Synkroniser header-spacer højde med header-viewport
+    this.resizeObserver = new ResizeObserver(() => this.syncHeaderSpacerHeight());
+    this.resizeObserver.observe(this.headerViewport);
+    this.syncHeaderSpacerHeight();
+  }
+
+  private syncHeaderSpacerHeight(): void {
+    // Kopier den faktiske computed height direkte fra header-viewport
+    const computedHeight = getComputedStyle(this.headerViewport).height;
+    this.headerSpacer.style.height = computedHeight;
   }
 
   private onScroll(): void {

wwwroot/css/calendar-v2.css

@@ -5,6 +5,7 @@
   --day-column-min-width: 200px;
   --day-start-hour: 6;
   --day-end-hour: 18;
+  --header-height: 70px;
   --color-border: #e0e0e0;
   --color-surface: #fff;
   --color-text-secondary: #666;
@@ -81,12 +82,16 @@ swp-time-axis {
   grid-column: 1;
   grid-row: 1 / 3;
   display: grid;
-  grid-template-rows: subgrid;
+  grid-template-rows: auto 1fr;
   border-right: 1px solid var(--color-border);
   background: var(--color-surface);
   overflow: hidden;
 }
 
+swp-header-spacer {
+  border-bottom: 1px solid var(--color-border);
+}
+
 swp-header-drawer {
   display: block;
   height: 0;
@@ -96,9 +101,9 @@ swp-header-drawer {
 }
 
 swp-time-axis-content {
-  display: grid;
-  grid-auto-rows: var(--hour-height);
-  overflow: hidden;
+  display: flex;
+  flex-direction: column;
+  position: relative;
 }
 
 swp-hour-marker {
@@ -118,6 +123,10 @@ swp-hour-marker {
     height: 1px;
     background: var(--color-hour-line);
   }
+
+  &:first-child::after {
+    display: none;
+  }
 }
 
 /* Grid container */