feat: prefix and anti multi-check

components/UserInputWrap.tsx

@@ -6,7 +6,7 @@ const UserInputWrap = ({ children, setUser }) => {
   const [begin, setBegin] = React.useState(false);
 
   React.useEffect(() => {
-    setInputUser(localStorage.getItem("user") || "");
+    setInputUser(localStorage.getItem("username") || "");
   }, []);
 
   return (
@@ -17,9 +17,10 @@ const UserInputWrap = ({ children, setUser }) => {
             display: "grid",
             placeItems: "center",
             alignItems: "center",
-            minHeight: "100vh",
+            // minHeight: "100vh",
           }}
         >
+          <h2 style={{ textAlign: "center" }}>ITSC 学 生 助 理 抢 班 系 统</h2>
           <div>
             <input
               style={{
@@ -45,7 +46,7 @@ const UserInputWrap = ({ children, setUser }) => {
                 }
                 setUser(inputUser.trim());
                 setBegin(true);
-                localStorage.setItem("user", inputUser.trim());
+                localStorage.setItem("username", inputUser.trim());
               }}
             >
               Login