refactor: Centralize error and notification handling using a dedicated _errorService across various components.

lib/services/auth_service.dart

@@ -233,7 +233,7 @@ class AuthService {
             ],
             // Configuration for Android/Web
             webAuthenticationOptions: WebAuthenticationOptions(
-              clientId: 'be.devdayronvl.TravelMate.service',
+              clientId: 'be.devdayronvl.travel_mate.service',
               redirectUri: Uri.parse(
                 'https://travelmate-a47f5.firebaseapp.com/__/auth/handler',
               ),