refactor(routes): simplify component loading syntax

frontend/src/app/feature/auth/oauth2/oauth2-callback.component.ts

@@ -19,7 +19,7 @@ import { Oauth2Service } from './oauth2.service';
     </div>
   `,
 })
-export class OAuth2CallbackComponent implements OnInit {
+export default class OAuth2CallbackComponent implements OnInit {
   error: Signal<string> = computed(() => this.oauthService.error());
 
   private route: ActivatedRoute = inject(ActivatedRoute);

frontend/src/app/feature/auth/recover-password/recover-password.component.ts

@@ -10,7 +10,7 @@ import { AuthService } from '@service/auth.service';
   imports: [CommonModule, ReactiveFormsModule, RouterModule],
   templateUrl: './recover-password.component.html',
 })
-export class RecoverPasswordComponent implements OnInit {
+export default class RecoverPasswordComponent implements OnInit {
   emailForm: FormGroup;
   resetPasswordForm: FormGroup;
   errorMessage = signal('');

frontend/src/app/feature/auth/verify-email/verify-email.component.ts

@@ -7,7 +7,7 @@ import { AuthService } from '@service/auth.service';
   imports: [],
   templateUrl: './verify-email.component.html',
 })
-export class VerifyEmailComponent implements OnInit {
+export default class VerifyEmailComponent implements OnInit {
   route: ActivatedRoute = inject(ActivatedRoute);
   router: Router = inject(Router);
   authService: AuthService = inject(AuthService);

frontend/src/app/feature/game/dice/dice.component.ts

@@ -24,7 +24,7 @@ type DiceFormGroup = FormGroup<{
   imports: [CommonModule, ReactiveFormsModule],
   templateUrl: './dice.component.html',
 })
-export class DiceComponent implements OnInit {
+export default class DiceComponent implements OnInit {
   private readonly formBuilder = inject(FormBuilder);
   private readonly diceService = inject(DiceService);
   private readonly userService = inject(UserService);