Several changes about token refreshing.

frontend/src/app/core/guard/authentication.guard.ts

@@ -3,11 +3,13 @@ import { CanActivateFn, Router } from "@angular/router";
 import { AuthenticationService } from "../service/authentication.service";
 import { MatSnackBar } from "@angular/material/snack-bar";
 
-export const authenticationGuard: CanActivateFn = () => {
+export const authenticationGuard: CanActivateFn = async () => {
     const authenticationService = inject(AuthenticationService);
     const router = inject(Router);
     const snackBar = inject(MatSnackBar);
 
+    await authenticationService.checkIsAuthenticated();
+
     if (authenticationService.isAuthenticated()) {
         return true;
     } else {