✨ Use Vue-based login page

src/store.js

@@ -1,5 +1,6 @@
 import { computed } from "@vue/reactivity";
 import { ref, watch } from "vue";
+import router from "./router";
 
 export const substitutionFilter = ref(
   localStorage.getItem("substitutionFilter") || "all"
@@ -62,6 +63,10 @@ export const parsedTimetable = computed(() => {
 
 export async function fetchData() {
   const baseUrl = "/api";
+
+  const checkResponse = await fetch(`${baseUrl}/check`);
+  if (checkResponse.status != 200) router.push("/login");
+
   const timetableResponse = await fetch(
     `${baseUrl}/timetable?class=${timetableClass.value}`
   );