fix(design): restore streamed replies and quote handoff

tests/unit/image-canvas-page.test.tsx

@@ -93,11 +93,12 @@ describe('youth AI Design Canvas page', () => {
     expect(screen.queryByText(/规格版本|编译器|生成策略|字段决策/)).not.toBeInTheDocument();
   });
 
-  it('keeps unfinished AI output out of the conversation while send status stays visible', () => {
-    prepareWorkspace();
-    const unfinishedDraft = '收到，我们要收到，我们要制作一张社团活动海报。';
+  it('shows one unfinished assistant reply incrementally and replaces it with the canonical turn', async () => {
+    const { workspace } = prepareWorkspace();
+    const firstChunk = '收到，我们要制作';
+    const unfinishedDraft = `${firstChunk}一张社团活动海报。`;
     useImageWorkspaceStore.setState({
-      assistantStreams: { 'operation-chat-1': unfinishedDraft },
+      assistantStreams: { 'operation-chat-1': firstChunk },
       pendingOperations: {
         'operation-chat-1': {
           id: 'operation-chat-1',
@@ -124,10 +125,66 @@ describe('youth AI Design Canvas page', () => {
     const pendingMessage = within(conversation).getByTestId('pending-design-chat-operation-chat-1');
     expect(within(pendingMessage).getByText('做一张社团活动海报')).toBeInTheDocument();
     expect(within(pendingMessage).getByText('发送中')).toBeInTheDocument();
+    expect(within(conversation).queryByRole('button', { name: '下一步：看看制作方案' }))
+      .not.toBeInTheDocument();
     expect(within(conversation).queryByTestId('design-assistant-progress')).not.toBeInTheDocument();
     expect(within(conversation).queryByText('AI 正在整理你的想法')).not.toBeInTheDocument();
     expect(within(conversation).getByText('我已经整理了用途、受众和初步概念，请确认右侧建议。')).toBeInTheDocument();
-    expect(within(conversation).queryByText(unfinishedDraft)).not.toBeInTheDocument();
+    const streamingReply = within(conversation)
+      .getByTestId('streaming-design-assistant-operation-chat-1');
+    expect(streamingReply).toHaveTextContent(firstChunk);
+
+    act(() => {
+      useImageWorkspaceStore.setState({
+        assistantStreams: { 'operation-chat-1': unfinishedDraft },
+      });
+    });
+    expect(streamingReply).toHaveTextContent(unfinishedDraft);
+
+    act(() => {
+      useImageWorkspaceStore.setState({
+        workspace: {
+          ...workspace,
+          turns: [...workspace.turns, {
+            turnId: 'turn-2',
+            rawTurnSequence: 2,
+            userMessage: '做一张社团活动海报',
+            assistantMessage: unfinishedDraft,
+          }],
+        },
+        pendingOperations: {},
+      });
+    });
+
+    await waitFor(() => {
+      expect(within(conversation).queryByTestId('streaming-design-assistant-operation-chat-1'))
+        .not.toBeInTheDocument();
+    });
+    expect(within(conversation).getAllByText(unfinishedDraft)).toHaveLength(1);
+    expect(within(conversation).getByRole('button', { name: '下一步：看看制作方案' }))
+      .toBeInTheDocument();
+  });
+
+  it('opens the mobile quote confirmation from the ready conversation without starting a paid task', async () => {
+    const { actions } = prepareWorkspace();
+    const quotedWorkspace = designWorkspaceFixture({
+      form: designFormFixture({ activeQuotes: [designQuoteFixture()] }),
+    });
+    actions.requestQuote.mockImplementationOnce(async () => {
+      useImageWorkspaceStore.setState({ workspace: quotedWorkspace });
+      return quotedWorkspace;
+    });
+    render(<ImageCanvas />);
+
+    const conversation = screen.getByTestId('image-workspace-conversation');
+    fireEvent.click(within(conversation).getByRole('button', { name: '下一步：看看制作方案' }));
+
+    expect(actions.requestQuote).toHaveBeenCalledOnce();
+    expect(actions.confirmGeneration).not.toHaveBeenCalled();
+    await waitFor(() => {
+      expect(screen.getByRole('heading', { name: '制作方案准备好了' })).toBeInTheDocument();
+    });
+    expect(screen.getByTestId('design-offered-quote')).toBeInTheDocument();
   });
 
   it('shows a submitted message immediately and replaces it with the canonical turn', async () => {
@@ -338,9 +395,13 @@ describe('youth AI Design Canvas page', () => {
     });
     render(<ImageCanvas />);
 
+    expect(within(screen.getByTestId('image-workspace-conversation'))
+      .getByRole('button', { name: '正在准备方案' })).toBeDisabled();
     openMobileCreationCard();
     expect(screen.getByText('还在确认刚才的操作')).toBeInTheDocument();
     expect(screen.getByText(/不会重复制作或重复扣费/)).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: '看看制作方案', exact: true })).toBeDisabled();
+    expect(actions.requestQuote).not.toHaveBeenCalled();
     fireEvent.click(screen.getByRole('button', { name: '查看原来的结果' }));
     expect(actions.retryOperation).toHaveBeenCalledWith('operation-1');
   });