Adds drag-to-scroll functionality for schedule tables

Enables intuitive horizontal scrolling for schedule containers

Implements drag scroll interaction with:
- Smooth scrolling experience
- Prevention of interaction with nested elements
- Improved mobile and desktop usability

PlanTempus.Application/wwwroot/ts/modules/employees.ts

@@ -426,6 +426,9 @@ class ScheduleController {
     this.editBtn = document.getElementById('scheduleEditBtn');
     this.scheduleTable = document.getElementById('scheduleTable');
 
+    // Drag scroll works for all schedule scroll containers (Vagtplan + Arbejdstid)
+    this.setupDragScroll();
+
     if (!this.scheduleTable) return;
 
     this.setupEditModeToggle();
@@ -436,6 +439,48 @@ class ScheduleController {
     this.setupDrawerSave();
   }
 
+  /**
+   * Setup drag-to-scroll on schedule scroll containers
+   */
+  private setupDragScroll(): void {
+    const scrollContainers = document.querySelectorAll('swp-schedule-scroll');
+
+    scrollContainers.forEach(container => {
+      const el = container as HTMLElement;
+      let isDown = false;
+      let startX = 0;
+      let scrollLeft = 0;
+
+      const onMouseDown = (e: MouseEvent) => {
+        // Don't drag if clicking on interactive elements
+        if ((e.target as HTMLElement).closest('swp-btn, input, select')) return;
+
+        isDown = true;
+        el.classList.add('dragging');
+        startX = e.clientX;
+        scrollLeft = el.scrollLeft;
+      };
+
+      const onMouseUp = () => {
+        isDown = false;
+        el.classList.remove('dragging');
+      };
+
+      const onMouseMove = (e: MouseEvent) => {
+        if (!isDown) return;
+        e.preventDefault();
+        const x = e.clientX;
+        const walk = (startX - x) * 1.5;
+        el.scrollLeft = scrollLeft + walk;
+      };
+
+      el.addEventListener('mousedown', onMouseDown);
+      el.addEventListener('mouseup', onMouseUp);
+      el.addEventListener('mouseleave', onMouseUp);
+      el.addEventListener('mousemove', onMouseMove);
+    });
+  }
+
   /**
    * Setup edit mode toggle button
    */