feat: surface platform errors in copyable dialogs

src/components/platform-entry/PlatformErrorDialog.test.tsx

@@ -0,0 +1,60 @@
+/* @vitest-environment jsdom */
+
+import {
+  fireEvent,
+  render,
+  screen,
+  waitFor,
+  within,
+} from '@testing-library/react';
+import { afterEach, describe, expect, test, vi } from 'vitest';
+
+import * as clipboardService from '../../services/clipboard';
+import { PlatformErrorDialog } from './PlatformErrorDialog';
+
+vi.mock('../../services/clipboard', () => ({
+  copyTextToClipboard: vi.fn(),
+}));
+
+afterEach(() => {
+  vi.clearAllMocks();
+});
+
+describe('PlatformErrorDialog', () => {
+  test('shows source, message, and copies the full error report', async () => {
+    vi.mocked(clipboardService.copyTextToClipboard).mockResolvedValue(true);
+
+    render(
+      <PlatformErrorDialog
+        error={{
+          source: '拼图草稿 puzzle-session-123',
+          message: '图片生成失败，请稍后再试。',
+        }}
+        onClose={() => {}}
+      />,
+    );
+
+    const dialog = screen.getByRole('dialog', { name: '发生错误' });
+    expect(within(dialog).getByText('拼图草稿 puzzle-session-123')).toBeTruthy();
+    expect(within(dialog).getByText('图片生成失败，请稍后再试。')).toBeTruthy();
+
+    fireEvent.click(within(dialog).getByRole('button', { name: '复制报错' }));
+
+    expect(clipboardService.copyTextToClipboard).toHaveBeenCalledWith(
+      ['来源：拼图草稿 puzzle-session-123', '错误：图片生成失败，请稍后再试。'].join(
+        '\n',
+      ),
+    );
+    await waitFor(() => {
+      expect(
+        within(dialog).getByRole('button', { name: '已复制' }),
+      ).toBeTruthy();
+    });
+  });
+
+  test('does not render when there is no active error', () => {
+    render(<PlatformErrorDialog error={null} onClose={() => {}} />);
+
+    expect(screen.queryByRole('dialog', { name: '发生错误' })).toBeNull();
+  });
+});