增加会话标题重命名功能，优化历史面板交互

src/components/chat/AgentHeader.test.tsx

@@ -0,0 +1,40 @@
+import React from "react";
+import { fireEvent, render, screen } from "@testing-library/react";
+import { ThemeProvider, createTheme } from "@mui/material/styles";
+
+import { AgentHeader } from "./AgentHeader";
+
+jest.mock("next/image", () => ({
+  __esModule: true,
+  default: (props: React.ComponentProps<"img">) => <img {...props} alt={props.alt ?? ""} />,
+}));
+
+const renderWithTheme = (ui: React.ReactElement) =>
+  render(<ThemeProvider theme={createTheme()}>{ui}</ThemeProvider>);
+
+describe("AgentHeader", () => {
+  it("submits a renamed active session title", () => {
+    const onRenameSessionTitle = jest.fn();
+
+    renderWithTheme(
+      <AgentHeader
+        sessionTitle="原始标题"
+        canRenameSessionTitle
+        isStreaming={false}
+        isHistoryOpen={false}
+        onHistoryToggle={jest.fn()}
+        onRenameSessionTitle={onRenameSessionTitle}
+        onNewConversation={jest.fn()}
+        onClose={jest.fn()}
+      />,
+    );
+
+    fireEvent.click(screen.getByRole("button", { name: "修改对话标题" }));
+    fireEvent.change(screen.getByPlaceholderText("请输入对话标题"), {
+      target: { value: "更新后的标题" },
+    });
+    fireEvent.click(screen.getByLabelText("确认修改对话标题"));
+
+    expect(onRenameSessionTitle).toHaveBeenCalledWith("更新后的标题");
+  });
+});