fix: 完善作品号复制与详情返回

src/components/puzzle-gallery/PuzzleGalleryDetailView.test.tsx

@@ -64,3 +64,35 @@ test('shows and copies puzzle public work code in detail view', async () => {
 
   expect(writeText).toHaveBeenCalledWith('PZ-EPUBLIC1');
 });
+
+test('falls back to legacy selection copy when clipboard api rejects', async () => {
+  const user = userEvent.setup();
+  const writeText = vi.fn(async () => {
+    throw new Error('clipboard denied');
+  });
+  const execCommand = vi.fn(() => true);
+  Object.defineProperty(navigator, 'clipboard', {
+    configurable: true,
+    value: { writeText },
+  });
+  Object.defineProperty(document, 'execCommand', {
+    configurable: true,
+    value: execCommand,
+  });
+
+  render(
+    <PuzzleGalleryDetailView
+      item={detailItem}
+      onBack={vi.fn()}
+      onStartGame={vi.fn()}
+    />,
+  );
+
+  await user.click(
+    screen.getByRole('button', { name: '复制作品号 PZ-EPUBLIC1' }),
+  );
+
+  expect(writeText).toHaveBeenCalledWith('PZ-EPUBLIC1');
+  expect(execCommand).toHaveBeenCalledWith('copy');
+  expect(await screen.findByText('已复制')).toBeTruthy();
+});