🐛 fix(ai-chat): 统一历史模式会话排序

- 面板内历史模式按最近更新时间优先展示会话

- 保持与历史侧栏一致的最近会话浏览体验

- 增加静态测试防止排序逻辑回退

frontend/src/components/AIChatPanel.message-boundary.test.tsx

@@ -27,4 +27,10 @@ describe('AIChatPanel message render isolation', () => {
     expect(source).toContain('以下是当前启用的 Skill');
     expect(source).toContain('buildAvailableAIChatTools');
   });
+
+  it('keeps the v2 history mode sorted by the latest updated session first', () => {
+    expect(source).toContain('const orderedAISessions = useMemo(');
+    expect(source).toContain('right.updatedAt - left.updatedAt');
+    expect(source).toContain('const sessions = orderedAISessions.slice(0, 8);');
+  });
 });

frontend/src/components/AIChatPanel.tsx

@@ -310,6 +310,10 @@ export const AIChatPanel: React.FC<AIChatPanelProps> = ({
         'sendAIChatMessage',
         activeShortcutPlatform,
     ));
+    const orderedAISessions = useMemo(
+        () => [...aiChatSessions].sort((left, right) => right.updatedAt - left.updatedAt),
+        [aiChatSessions],
+    );
 
     const getCurrentJVMPlanContext = useCallback((): JVMAIPlanContext | undefined => {
         const state = useStore.getState();
@@ -1850,7 +1854,7 @@ SELECT * FROM users WHERE status = 1;
     }, [contextTableNames, sqlLogs]);
 
     const renderPanelHistoryList = () => {
-        const sessions = aiChatSessions.slice(0, 8);
+        const sessions = orderedAISessions.slice(0, 8);
         if (sessions.length === 0) {
             return <div className="gn-v2-ai-empty-note">暂无历史会话</div>;
         }