窗口失焦时丢弃未提交的树拖拽

PreviewWorkspace.tsx 的 onWindowBlur 一并清掉 treeDragRef 与树拖拽预览偏移：失焦时浏览器不一定补 pointercancel，陈旧手势会被后续 pointerup 复用并把意外偏移写进文档
tests/previewRightPanDrag.test.tsx 补失焦后抬起不提交偏移的用例

apps/ai-game-creator-shell/src/view/ui-editor/components/preview/PreviewWorkspace.tsx

@@ -404,6 +404,17 @@ export function PreviewWorkspace({
       rightPressSequenceRef.current = false;
       rightPanRef.current = null;
       setIsPanning(false);
+      // 失焦时浏览器不一定补 pointercancel：丢掉未提交的树拖拽，避免后续指针事件
+      // 复用陈旧手势把意外偏移写进文档。
+      const drag = treeDragRef.current;
+      if (drag) {
+        treeDragRef.current = null;
+        setPreviewTreeOffsets((current) => {
+          const next = new Map(current);
+          next.delete(drag.treeId);
+          return next;
+        });
+      }
     };
     window.addEventListener('keydown', onKeyDown);
     window.addEventListener('keyup', onKeyUp);

apps/ai-game-creator-shell/tests/previewRightPanDrag.test.tsx

@@ -263,6 +263,32 @@ describe('PreviewWorkspace tree drag', () => {
     });
     expect(cancelled.canvas.setTreeOffset).not.toHaveBeenCalled();
   });
+
+  it('drops an in-flight tree drag when the window loses focus', () => {
+    const { canvas, rootNode, treeLayer } = renderTreeDrag();
+    dispatchPointer(rootNode, 'pointerdown', {
+      button: 0,
+      clientX: 10,
+      clientY: 10,
+      pointerId: 13,
+    });
+    dispatchPointer(treeLayer, 'pointermove', {
+      clientX: 40,
+      clientY: 50,
+      pointerId: 13,
+    });
+
+    act(() => {
+      window.dispatchEvent(new Event('blur'));
+    });
+    dispatchPointer(treeLayer, 'pointerup', {
+      button: 0,
+      clientX: 40,
+      clientY: 50,
+      pointerId: 13,
+    });
+
+    expect(canvas.setTreeOffset).not.toHaveBeenCalled();
   });
 
   describe('PreviewWorkspace right-button pan', () => {
@@ -348,7 +374,9 @@ describe('PreviewWorkspace right-button pan', () => {
 
       expect(canvas.selectNode).toHaveBeenCalledWith('child');
       expect(screen.getByRole('menu').style.left).toBe('101px');
-    expect(screen.getByRole('menuitem', { name: '新增同级节点' })).toBeTruthy();
+      expect(
+        screen.getByRole('menuitem', { name: '新增同级节点' }),
+      ).toBeTruthy();
     });
 
     it('opens the node menu when pointerup is retargeted to the capture element', () => {
@@ -516,3 +544,4 @@ describe('PreviewWorkspace right-button pan', () => {
       expect(canvas.updateNodeTransform).toHaveBeenCalledTimes(1);
     });
   });
+});