Adds edge scroll functionality for drag interactions

Implements EdgeScrollManager to enable automatic scrolling during drag operations

Introduces new scroll management system that:
- Detects mouse proximity to container edges
- Provides variable scroll speed based on mouse position
- Compensates dragged elements during scrolling

Enhances drag-and-drop user experience with smooth scrolling

src/v2/managers/DragDropManager.ts

@@ -46,7 +46,22 @@ export class DragDropManager {
   constructor(
     private eventBus: IEventBus,
     private gridConfig: IGridConfig
-  ) {}
+  ) {
+    this.setupScrollListener();
+  }
+
+  private setupScrollListener(): void {
+    this.eventBus.on(CoreEvents.EDGE_SCROLL_TICK, (e) => {
+      if (!this.dragState) return;
+      const { scrollDelta } = (e as CustomEvent<{ scrollDelta: number }>).detail;
+
+      // Element skal flytte med scroll for at forblive under musen
+      // (elementets top er relativ til kolonnen, som scroller med viewport)
+      this.dragState.targetY += scrollDelta;
+      this.dragState.currentY += scrollDelta;
+      this.dragState.element.style.top = `${this.dragState.currentY}px`;
+    });
+  }
 
   /**
    * Initialize drag-drop on a container element
@@ -165,6 +180,9 @@ export class DragDropManager {
     const columnRect = columnElement.getBoundingClientRect();
     const targetY = e.clientY - columnRect.top - mouseOffset.y;
 
+    // Reset scroll compensation
+    this.scrollDeltaY = 0;
+
     // Initialize drag state
     this.dragState = {
       eventId,