优化叠加模式子节点显示

从互斥模式切回叠加模式时恢复全部直接子节点可见

补充模式切换回归测试并同步实施合同

apps/ai-game-creator-shell/src/view/ui-editor/useUiEditorPage.ts

@@ -741,11 +741,24 @@ export function useUiEditorSession(
 
   function setNodeChildrenDisplayMode(mode: ChildrenDisplayMode) {
     if (!activeImageId || !selectedNodeId) return;
+    const selectedNode = treeForActiveImage
+      ? findUiNodeLocation(treeForActiveImage.root, selectedNodeId)?.node
+      : null;
     const result = editor.setNodeChildrenDisplayMode(
       activeImageId,
       selectedNodeId,
       mode,
     );
+    if (result.ok && mode === 'Stack' && selectedNode) {
+      setHiddenNodeIds((current) => {
+        if (!selectedNode.children.some((child) => current.has(child.id))) {
+          return current;
+        }
+        const next = new Set(current);
+        for (const child of selectedNode.children) next.delete(child.id);
+        return next;
+      });
+    }
     if (!result.ok) setStatus('子节点显示模式更新失败。');
     return result;
   }

apps/ai-game-creator-shell/tests/uiEditorPage.test.ts

@@ -436,6 +436,13 @@ describe('UiEditorPage', () => {
     act(() => result.current.canvas.selectExclusiveChild(childAId!));
     expect(result.current.canvas.isNodePreviewVisible(childAId!)).toBe(true);
     expect(result.current.canvas.isNodePreviewVisible(childBId!)).toBe(false);
+
+    act(() => result.current.inspector.setNodeChildrenDisplayMode('Stack'));
+    expect(result.current.canvas.isNodePreviewVisible(childAId!)).toBe(true);
+    expect(result.current.canvas.isNodePreviewVisible(childBId!)).toBe(true);
+    expect(
+      result.current.canvas.isNodePreviewVisible(childBDescendantId!),
+    ).toBe(true);
   });
 
   it('shows a page-level save failure and allows a retry', async () => {