fix: implement scroll-to-top behavior for about navigation

frontend/src/App.tsx

@@ -1,5 +1,11 @@
 import { lazy, Suspense, useEffect, useRef } from "react";
-import { BrowserRouter, Navigate, Route, Routes } from "react-router-dom";
+import {
+  BrowserRouter,
+  Navigate,
+  Route,
+  Routes,
+  ScrollRestoration,
+} from "react-router-dom";
 import { ProtectedRoute, PublicRoute } from "./components/RouteGuards";
 import SplashScreen from "./components/SplashScreen";
 import { ROUTES } from "./config/routes";