修复资源画本转场克隆的层级与静态不一致

转场层里的克隆只按自身 DOM 顺序叠放，而静态场景中卡片是 25、标题栏是 30，导致动画期间卡片盖住标题栏、结束后又瞬间跳回下方
快照记录元素自身或最近定位祖先的 z-index，克隆按该值设置层级，保持静态层叠关系
补充 resourceBookController 层级回归用例

apps/ai-game-creator-shell/src/view/project-development/resourceBookController.ts

@@ -5,6 +5,7 @@ type Snapshot = {
   key: string;
   rect: { left: number; top: number; width: number; height: number };
   opacity: number;
+  zIndex: number;
   content: HTMLElement;
 };
 
@@ -43,6 +44,24 @@ function freezeBlobImageSource(image: HTMLImageElement) {
   }
 }
 
+/**
+ * 转场层里的克隆只按自己的 DOM 顺序叠放，和静态场景的层级不一致：卡片会盖住
+ * 标题栏，动画结束再瞬间跳回下方。取元素自身或最近定位祖先的 z-index，让克隆
+ * 保持静态时的层叠关系。
+ */
+function effectiveZIndex(element: HTMLElement, root: HTMLElement) {
+  for (
+    let node: HTMLElement | null = element;
+    node;
+    node = node.parentElement
+  ) {
+    const parsed = Number.parseInt(getComputedStyle(node).zIndex, 10);
+    if (Number.isFinite(parsed)) return parsed;
+    if (node === root) break;
+  }
+  return 0;
+}
+
 // Freeze presentation only. Clones cannot expose duplicate controls, replay
 // media, or depend on CSS selectors belonging to the old ancestor tree.
 function clonePresentation(
@@ -188,6 +207,7 @@ function capture(root: HTMLElement): Map<string, Snapshot> {
       key,
       rect,
       opacity,
+      zIndex: effectiveZIndex(element, root),
       content: clonePresentation(
         element.dataset.motionSnapshot
           ? (element.firstElementChild as HTMLElement)
@@ -285,6 +305,7 @@ export function createResourceBookTransitionController() {
             height: `${item.rect.height}px`,
             transformOrigin: '0 0',
             pointerEvents: 'none',
+            zIndex: String(item.zIndex),
           });
           wrapper.append(item.content);
           layer.append(wrapper);

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

@@ -138,6 +138,46 @@ describe('resource book FLIP controller', () => {
     controller.dispose();
   });
 
+  it('keeps the static stacking order inside the transition layer', () => {
+    Object.defineProperty(Element.prototype, 'animate', {
+      configurable: true,
+      writable: true,
+      value: () => ({
+        finished: Promise.resolve({} as Animation),
+        cancel: () => undefined,
+      }),
+    });
+    const root = document.createElement('div');
+    root.innerHTML = `<div class="game-resource-book-scene"><div class="game-resource-book-scene-world">
+      <div class="game-resource-book-scene-titlebar" style="z-index: 30"><span>标题</span></div>
+      <div class="game-resource-book-scene-card" style="z-index: 25"><div class="game-resource-card" data-resource-card-id="one"><img src="blob:card-preview" alt="" /></div></div>
+      </div></div><div class="game-resource-book-transition-layer" inert aria-hidden="true"></div>`;
+    document.body.append(root);
+    vi.spyOn(root, 'getBoundingClientRect').mockReturnValue(rect(0, 0, 800, 600));
+    for (const element of root.querySelectorAll<HTMLElement>(
+      '.game-resource-book-scene-titlebar, .game-resource-card',
+    )) {
+      vi.spyOn(element, 'getBoundingClientRect').mockReturnValue(rect());
+    }
+
+    const controller = createResourceBookTransitionController();
+    const token = controller.begin(root);
+    controller.play(root, token, () => undefined);
+
+    const wrappers = Array.from(
+      root.querySelectorAll<HTMLElement>('[data-motion-snapshot]'),
+    );
+    const titleWrapper = wrappers.find((element) =>
+      element.dataset.motionSnapshot?.startsWith('title:'),
+    );
+    const cardWrapper = wrappers.find((element) =>
+      element.dataset.motionSnapshot?.startsWith('card:'),
+    );
+    expect(Number(titleWrapper?.style.zIndex)).toBe(30);
+    expect(Number(cardWrapper?.style.zIndex)).toBe(25);
+    controller.dispose();
+  });
+
   it('retargets from the current overlay geometry and ignores old completion', async () => {
     const { root, measure, flights } = setup();
     const controller = createResourceBookTransitionController();