固化键盘菜单键不被右键手势拦截的口径

- 实测 Chromium 151 下键盘菜单键触发的是 button: -1，previewRightPanGesture 注释写明只认按钮 2 的原因
- previewRightPanGesture.test.ts 增加 button: -1 不拦截的判据用例
- previewRightPanDrag.test.tsx 增加键盘菜单键仍走原有节点菜单路径的集成用例
- decision-log 条目补上该实测结论与新增用例的验证口径

验证：npx vitest run previewRightPanDrag.test.tsx previewRightPanGesture.test.ts（13 passed）

apps/ai-game-creator-shell/src/view/ui-editor/components/preview/previewRightPanGesture.ts

@@ -79,6 +79,7 @@ export function resolvePreviewRightPanRelease({
  * 平台差异：Windows / Linux 的 Chromium 与 Firefox 在**按下**时触发 contextmenu，
  * macOS 在指针抬起之后触发；而原生菜单一旦弹出，页面之后收不到 pointermove / pointerup，
  * 所以必须按下时就拦截，并把拦截窗口保留到下一次指针按下之前。
+ * 键盘菜单键不在此列：Chromium 实测上报 `button: -1`，只认 2 正好把它留给原有菜单路径。
  */
 export function shouldInterceptRightContextMenu({
   button,

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

@@ -350,6 +350,21 @@ describe('PreviewWorkspace right-button pan', () => {
     expect(screen.getByRole('menu')).toBeTruthy();
   });
 
+  it('leaves the keyboard menu key to the existing node menu path', () => {
+    const { canvas, child } = renderPreview();
+
+    dispatchPointer(child, 'pointerdown', {
+      button: 2,
+      clientX: 100,
+      clientY: 100,
+      pointerId: 13,
+    });
+    // 键盘菜单键在 Chromium 上报 button: -1，不能被右键手势的拦截窗口吃掉。
+    expect(fireEvent.contextMenu(child, { button: -1 })).toBe(false);
+    expect(canvas.selectNode).toHaveBeenCalledWith('child');
+    expect(screen.getByRole('menu')).toBeTruthy();
+  });
+
   it('keeps middle-button panning and its shared grabbing cursor', () => {
     const { container, preview } = renderPreview();
     const before = worldTranslate(container);

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

@@ -96,5 +96,11 @@ describe('preview right-button pan gesture', () => {
         withinRightPressSequence: true,
       }),
     ).toBe(false);
+    expect(
+      shouldInterceptRightContextMenu({
+        button: -1,
+        withinRightPressSequence: true,
+      }),
+    ).toBe(false);
   });
 });