fix: delayed displaying of messages, transactions using signals

client/src/app/services/auth-guard.ts

@@ -1,13 +1,14 @@
 import { inject } from '@angular/core';
 import { CanActivateFn, Router } from '@angular/router';
 import { APIService } from './api';
-import { map } from 'rxjs/operators';
+import { map, take } from 'rxjs/operators';
 
 export const authGuard: CanActivateFn = (route, state) => {
   const api = inject(APIService);
   const router = inject(Router);
 
-  return api.checkAuthStatus().pipe(
+  return api.isAuthenticated$.pipe(
+    take(1),
     map((isAuthenticated) => {
       if (isAuthenticated) {
         return true;