更新导航路径，修复确认按钮逻辑

src/pages/U4/u4.tsx

@@ -16,7 +16,7 @@ const U4: React.FC = () => {
   const navigate = useNavigate();
   const [test, setTest] = React.useState<testType[]>([]);
   const handleConfirm = () => {
-    navigate("/u5");
+    navigate("/UI6");
   };
   React.useEffect(() => {
     setTest([