Refactor edge scroll management for drag operations

Simplifies EdgeScrollManager implementation with more focused and efficient auto-scrolling logic

Removes unnecessary complexity and scroll tracking
Optimizes scroll velocity calculation and boundary detection
Improves performance by using requestAnimationFrame for smooth scrolling

src/v2/managers/DragDropManager.ts

@@ -180,9 +180,6 @@ 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,