refactor(app_event): update AppUserAppSettingsChanged event type

    This commit updates the `AppUserAppSettingsChanged` event to use the `AppSettings`
    model instead of the deprecated `UserAppSettings` model, ensuring type consistency
    across the application's global state management.

Author: fulleni

lib/app/bloc/app_event.dart

@@ -1,13 +1,13 @@
 part of 'app_bloc.dart';
 
-abstract class AppEvent extends Equatable {
+sealed class AppEvent extends Equatable {
   const AppEvent();
 
   @override
   List<Object?> get props => [];
 }
 
-class AppUserChanged extends AppEvent {
+final class AppUserChanged extends AppEvent {
   const AppUserChanged(this.user);
 
   final User? user;
@@ -16,22 +16,15 @@ class AppUserChanged extends AppEvent {
   List<Object?> get props => [user];
 }
 
-/// {@template app_logout_requested}
-/// Event to request user logout.
-/// {@endtemplate}
-class AppLogoutRequested extends AppEvent {
-  /// {@macro app_logout_requested}
+final class AppLogoutRequested extends AppEvent {
   const AppLogoutRequested();
 }
 
-/// {@template app_user_app_settings_changed}
-/// Event to notify that user application settings have changed.
-/// {@endtemplate}
+/// Event for when the user's app settings are changed.
 final class AppUserAppSettingsChanged extends AppEvent {
-  /// {@macro app_user_app_settings_changed}
   const AppUserAppSettingsChanged(this.appSettings);
 
-  /// The updated user application settings.
+  /// The new user app settings.
   final AppSettings appSettings;
 
   @override