BLoC Pattern

• Sealed States & Events: Always use sealed class for both States and Events to ensure exhaustive UI handling and compile-time safety.
• Immutability: All States, Events, and Domain Entities MUST be immutable (using final and Equatable or freezed).
• Official BLoC Part-Part Of Pattern: Every _bloc.dart file MUST include its corresponding _event.dart and _state.dart files using part directives. Each event/state file MUST have a part of directive pointing back to the bloc file. This ensures a single library scope and shared private members.

  // auth_bloc.dart
  part 'auth_event.dart';
  part 'auth_state.dart';
  
  class AuthBloc extends Bloc<AuthEvent, AuthState> { ... }
  
  // auth_event.dart
  part of 'auth_bloc.dart';