Adjust checkAuthStatus timing and introduce reloadUsername on service initialization.

frontend/src/app/services/auth.service.ts

@@ -23,8 +23,10 @@ export class AuthService {
     private snackBar: MatSnackBar
   ) {
     // Check if user is already logged in on service initialization
+    this.checkAuthStatus();
+
     timer(1000).subscribe(() => {
-      this.checkAuthStatus();
+      this.reloadUsername();
     });
   }