* dnd: fix duplicated cleanup and onChange old-state in vanilla components

- Draggable: guard `_clean()` against repeated invocation by tracking `_needClean` state, avoiding redundant class/attribute resets
- Moveable: pass the previous state (not the new one) as `oldState` to `onChange`, and drop the unused `_raf` field

Author: catouse

lib/dnd/src/vanilla/draggable.ts

@@ -30,7 +30,7 @@ export class Draggable extends Component<DraggableOptions> {
     protected _$targets?: Cash;
 
     /** 标记是否需要执行清理。Whether cleanup is pending. */
-    protected declare _needClean: boolean;
+    protected _needClean = true;
 
     /** 拖拽事件监听容器的 Cash 包装。Cash-wrapped drag event container. */
     protected declare _$dragContainer: Cash;
@@ -303,7 +303,10 @@ export class Draggable extends Component<DraggableOptions> {
      * Clean up drag/drop state: remove all drag-related CSS classes and droppable attributes, reset internal state.
      */
     protected _clean() {
-        this._needClean = true;
+        if (this._needClean === false) {
+            return;
+        }
+        this._needClean = false;
 
         const {draggingClass, droppableClass, droppingClass, hasDraggingClass} = this.options;
         if (hasDraggingClass) {

lib/dnd/src/vanilla/moveable.ts

@@ -26,9 +26,6 @@ export class Moveable extends Component<MoveableOptions> {
     /** 当前移动状态，未在移动时为 undefined。The current move state; undefined when idle. */
     protected _state?: MoveableState;
 
-    /** requestAnimationFrame 标识符。requestAnimationFrame handle. */
-    protected declare _raf: number;
-
     /** 获取当前移动状态。Get the current move state. */
     get state() {
         return this._state;
@@ -193,14 +190,15 @@ export class Moveable extends Component<MoveableOptions> {
         }
 
         const {deltaX, deltaY, event} = this._state!;
+        const oldState = this._state!;
         this._state = {
-            ...this._state!,
+            ...oldState,
             deltaX: deltaX + targetDx,
             deltaY: deltaY + targetDy,
         };
 
         this.options.onMove?.call(this, event, this._state);
-        this.options.onChange?.call(this, this._state, this._state, event);
+        this.options.onChange?.call(this, this._state, oldState, event);
     }
 
     /**