fix(design): bound requests and prevent mutation replay

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

@@ -627,6 +627,95 @@ describe('Works Square AI design adapter', () => {
     );
   });
 
+  it('aborts a stuck Quote request at the design request deadline', async () => {
+    vi.useFakeTimers();
+    try {
+      let requestSignal: AbortSignal | null = null;
+      const fetchMock = vi.fn<typeof fetch>((_input, init) => {
+        requestSignal = init?.signal ?? null;
+        return new Promise<Response>(() => undefined);
+      });
+      const adapter = new WorksSquareDesignWorkspace({
+        apiBaseUrl: 'https://square.example',
+        fetchImpl: fetchMock,
+        requestTimeoutMs: 25,
+      });
+
+      const outcome = adapter.updateGenerationQuote({
+        workspaceId: 'workspace-one',
+        quoteId: 'quote-one',
+        finalPrompt: 'updated prompt',
+        generationParameters: quoteConfirmationInput.generationParameters,
+      }).then(
+        () => ({ state: 'resolved' as const }),
+        (error: unknown) => ({ state: 'rejected' as const, error }),
+      );
+      await vi.advanceTimersByTimeAsync(25);
+
+      await expect(Promise.race([
+        outcome,
+        Promise.resolve({ state: 'pending' as const }),
+      ])).resolves.toMatchObject({
+        state: 'rejected',
+        error: {
+          status: 504,
+          code: 'DESIGN_WORKSPACE_REQUEST_TIMEOUT',
+          message: 'AI 设计服务响应超时，请重试',
+        },
+      });
+      expect(requestSignal?.aborted).toBe(true);
+      expect(fetchMock).toHaveBeenCalledOnce();
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  it('also bounds a Quote response whose JSON body never finishes', async () => {
+    vi.useFakeTimers();
+    try {
+      let requestSignal: AbortSignal | null = null;
+      const fetchMock = vi.fn<typeof fetch>((_input, init) => {
+        requestSignal = init?.signal ?? null;
+        return Promise.resolve(new Response(new ReadableStream<Uint8Array>({
+          start: () => undefined,
+        }), {
+          status: 200,
+          headers: { 'Content-Type': 'application/json' },
+        }));
+      });
+      const adapter = new WorksSquareDesignWorkspace({
+        apiBaseUrl: 'https://square.example',
+        fetchImpl: fetchMock,
+        requestTimeoutMs: 25,
+      });
+
+      const outcome = adapter.updateGenerationQuote({
+        workspaceId: 'workspace-one',
+        quoteId: 'quote-one',
+        finalPrompt: 'updated prompt',
+        generationParameters: quoteConfirmationInput.generationParameters,
+      }).then(
+        () => ({ state: 'resolved' as const }),
+        (error: unknown) => ({ state: 'rejected' as const, error }),
+      );
+      await vi.advanceTimersByTimeAsync(25);
+
+      await expect(Promise.race([
+        outcome,
+        Promise.resolve({ state: 'pending' as const }),
+      ])).resolves.toMatchObject({
+        state: 'rejected',
+        error: {
+          status: 504,
+          code: 'DESIGN_WORKSPACE_REQUEST_TIMEOUT',
+        },
+      });
+      expect(requestSignal?.aborted).toBe(true);
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
   it('normalizes the server video option shape so the duration picker stays available', async () => {
     const videoConversation = {
       ...serverConversation,
@@ -1731,6 +1820,7 @@ describe('Works Square AI design adapter', () => {
     expect(getTokenMock).toHaveBeenNthCalledWith(2, {
       fetchImpl: fetchMock,
       forceRefresh: true,
+      requestTimeoutMs: 30_000,
     });
     expect(fetchMock).toHaveBeenNthCalledWith(
       2,