Major refactor into type safe TS

With a risk oof rolling it all back

src/types/DragDropTypes.ts

@@ -0,0 +1,47 @@
+/**
+ * Type definitions for drag and drop functionality
+ */
+
+export interface MousePosition {
+  x: number;
+  y: number;
+  clientX?: number;
+  clientY?: number;
+}
+
+export interface DragOffset {
+  x: number;
+  y: number;
+  offsetX?: number;
+  offsetY?: number;
+}
+
+export interface DragState {
+  isDragging: boolean;
+  draggedElement: HTMLElement | null;
+  draggedClone: HTMLElement | null;
+  eventId: string | null;
+  startColumn: string | null;
+  currentColumn: string | null;
+  mouseOffset: DragOffset;
+}
+
+export interface DragEndPosition {
+  column: string;
+  y: number;
+  snappedY: number;
+  time?: Date;
+}
+
+export interface StackLinkData {
+  prev?: string;
+  next?: string;
+  isFirst?: boolean;
+  isLast?: boolean;
+}
+
+export interface DragEventHandlers {
+  handleDragStart?(originalElement: HTMLElement, eventId: string, mouseOffset: DragOffset, column: string): void;
+  handleDragMove?(eventId: string, snappedY: number, column: string, mouseOffset: DragOffset): void;
+  handleDragEnd?(eventId: string, originalElement: HTMLElement, draggedClone: HTMLElement, finalColumn: string, finalY: number): void;
+}