fix(design): normalize video quote options

tests/unit/works-square-design-workspace.test.ts

@@ -592,6 +592,53 @@ describe('Works Square AI design adapter', () => {
     );
   });
 
+  it('normalizes the server video option shape so the duration picker stays available', async () => {
+    const videoConversation = {
+      ...serverConversation,
+      brief: { ...serverConversation.brief, medium: 'video' },
+      messages: serverConversation.messages.map((message) => ({
+        ...message,
+        generation_quote: {
+          ...message.generation_quote!,
+          medium: 'video',
+          generation_parameters: {
+            ...message.generation_quote!.generation_parameters,
+            model: 'wan2.7-i2v-2026-04-25',
+            resolution: '720P',
+            aspect_ratio: '4:5',
+            duration_seconds: 4,
+          },
+          generation_options: {
+            models: [{ id: 'wan2.7-i2v-2026-04-25', label: '万相视频', enabled: true, multiplier: 1 }],
+            resolutions: [{ value: '720P', label: '720P', enabled: true, multiplier: 1 }],
+            durations: [
+              { seconds: 2, label: '2 秒', enabled: true, multiplier: 1 },
+              { seconds: 6, label: '6 秒', enabled: true, multiplier: 1 },
+            ],
+            aspect_ratios: [{ value: '4:5', label: '4:5', default: true, enabled: true, multiplier: 1 }],
+          },
+        },
+      })),
+    };
+    const fetchMock = vi.fn<typeof fetch>().mockResolvedValueOnce(jsonResponse(videoConversation));
+    const adapter = new WorksSquareDesignWorkspace({
+      apiBaseUrl: 'https://square.example',
+      fetchImpl: fetchMock,
+    });
+
+    const mapped = await adapter.getConversation('workspace-one', 'conversation-one');
+    const quote = mapped.messages[0].generationQuote!;
+
+    expect(mapped.brief.medium).toBe('video');
+    expect(quote.medium).toBe('video');
+    expect(quote.generationOptions.models[0]).toMatchObject({
+      value: 'wan2.7-i2v-2026-04-25',
+      disabled: false,
+    });
+    expect(quote.generationOptions.durations.map((option) => option.value)).toEqual([2, 6]);
+    expect(quote.generationOptions.durations.every((option) => !option.disabled)).toBe(true);
+  });
+
   it('uploads a local reference image as multipart data and maps the returned Asset', async () => {
     const fetchMock = vi.fn<typeof fetch>().mockResolvedValueOnce(jsonResponse({
       asset_id: 'asset-uploaded',