Refactors all-day event layout calculation

Simplifies all-day event rendering by streamlining the layout
calculation and event placement process, using the AllDayLayoutEngine
to determine the grid positions. This removes deprecated methods
and improves overall code clarity.

src/types/EventTypes.ts

@@ -64,6 +64,7 @@ export interface DragMoveEventPayload {
 // Drag end event payload
 export interface DragEndEventPayload {
   draggedElement: HTMLElement;
+  draggedClone: HTMLElement | null;
   mousePosition: MousePosition;
   finalPosition: {
     column: string | null;