fix(chat): 重新生成前撤销旧消息

src/components/chat/hooks/useAgentChatSession.test.tsx

@@ -521,4 +521,33 @@ describe("useAgentChatSession", () => {
       expect.anything(),
     );
   });
+
+  it("asks the backend to undo the previous user turn before regenerating", async () => {
+    listChatSessions.mockResolvedValue([]);
+
+    const { result } = renderHook(() =>
+      useAgentChatSession({
+        projectId: "project-1",
+        onToolCall: jest.fn(),
+      }),
+    );
+
+    await waitFor(() => expect(result.current.isHydrating).toBe(false));
+
+    await act(async () => {
+      await result.current.sendPrompt("重新分析压力异常");
+    });
+
+    await act(async () => {
+      await result.current.regenerate();
+    });
+
+    expect(streamAgentChat).toHaveBeenNthCalledWith(
+      2,
+      expect.objectContaining({
+        message: "重新分析压力异常",
+        regenerateFromMessageIndex: 0,
+      }),
+    );
+  });
 });