feat: add visual novel AI image entry points

src/components/visual-novel-result/VisualNovelResultView.test.tsx

@@ -11,6 +11,8 @@ import { VisualNovelResultView } from './VisualNovelResultView';
 vi.mock('../../services/visual-novel-creation', () => ({
   createVisualNovelBackgroundMusicTask: vi.fn(),
   createVisualNovelSoundEffectTask: vi.fn(),
+  generateVisualNovelImageAsset: vi.fn(),
+  buildVisualNovelImageGenerationPrompt: vi.fn(() => '默认图片提示词'),
   listVisualNovelHistoryAssets: vi.fn().mockResolvedValue([]),
   publishVisualNovelBackgroundMusicAsset: vi.fn(),
   publishVisualNovelSoundEffectAsset: vi.fn(),
@@ -134,3 +136,58 @@ test('visual novel result uploads scene and character assets into platform refer
     onSaveDraft.mock.calls[0]?.[0].scenes[0]?.backgroundImageSrc,
   ).toContain('/generated-custom-world-scenes/');
 });
+
+test('visual novel result generates scene background from asset picker', async () => {
+  const user = userEvent.setup();
+  const onSaveDraft = vi.fn();
+  const visualNovelCreation = await import('../../services/visual-novel-creation');
+  const generateImageMock = vi.mocked(
+    visualNovelCreation.generateVisualNovelImageAsset,
+  );
+
+  generateImageMock.mockResolvedValue({
+    imageSrc: '/generated-custom-world-scenes/vn-profile/scene-ai.webp',
+    assetId: 'asset-scene-ai',
+    model: 'test-image-model',
+    size: '1280*720',
+    taskId: 'task-scene-ai',
+    prompt: '默认图片提示词',
+  });
+
+  render(
+    <VisualNovelResultView
+      draft={mockVisualNovelDraft}
+      onBack={() => {}}
+      onSaveDraft={onSaveDraft}
+    />,
+  );
+
+  await user.click(screen.getByRole('button', { name: '场景' }));
+  await user.click(screen.getByRole('button', { name: /风雪站台/u }));
+
+  const editorDialog = screen.getByRole('dialog', { name: '风雪站台' });
+  await user.click(
+    within(editorDialog).getAllByRole('button', { name: '背景图' })[0]!,
+  );
+  await user.click(
+    within(screen.getByRole('dialog', { name: '背景图' })).getByRole('button', {
+      name: 'AI生成',
+    }),
+  );
+
+  await user.click(within(editorDialog).getByRole('button', { name: '关闭' }));
+  await user.click(screen.getAllByRole('button', { name: '保存草稿' })[1]!);
+
+  expect(generateImageMock).toHaveBeenCalledWith(
+    expect.objectContaining({
+      kind: 'scene_background',
+      scene: expect.objectContaining({
+        sceneId: mockVisualNovelDraft.scenes[0]?.sceneId,
+      }),
+      prompt: '默认图片提示词',
+    }),
+  );
+  expect(onSaveDraft.mock.calls[0]?.[0].scenes[0]?.backgroundImageSrc).toBe(
+    '/generated-custom-world-scenes/vn-profile/scene-ai.webp',
+  );
+});