style: fix formatting and add missing commas in code

frontend/src/app/app.component.ts

@@ -21,11 +21,11 @@ import { SoundInitializerService } from './shared/services/sound-initializer.ser
     PlaySoundDirective,
   ],
   templateUrl: './app.component.html',
-  hostDirectives: [PlaySoundDirective]
+  hostDirectives: [PlaySoundDirective],
 })
 export class AppComponent {
   private soundInitializer = inject(SoundInitializerService);
-  
+
   showLogin = signal(false);
   showRegister = signal(false);
   showRecoverPassword = signal(false);