added and fixed minor details

frontend/src/routes/index.tsx

@@ -1,9 +1,21 @@
-import { createFileRoute } from '@tanstack/react-router'
+import { isAuthenticated } from "../utils/auth";
+import { createFileRoute, redirect } from "@tanstack/react-router";
 
-export const Route = createFileRoute('/')({
+export const Route = createFileRoute("/")({
+  beforeLoad: async () => {
+    if (!(await isAuthenticated())) {
+      throw redirect({
+        to: "/login",
+      });
+    } else {
+      throw redirect({
+        to: "/app/inventory",
+      });
+    }
+  },
   component: RouteComponent,
-})
+});
 
 function RouteComponent() {
-  return <div>Index "/"!</div>
+  return;
 }