feat(logging): add logging to auth feature

apps/lib/features/auth/presentation/bloc/auth_bloc.dart

@@ -1,10 +1,12 @@
 import 'package:flutter_bloc/flutter_bloc.dart';
+import '../../../../core/logging/logger.dart';
 import '../../data/repositories/auth_repository.dart';
 import 'auth_event.dart';
 import 'auth_state.dart';
 
 class AuthBloc extends Bloc<AuthEvent, AuthState> {
   final AuthRepository _repository;
+  final Logger _logger = getLogger('features.auth.bloc');
 
   AuthBloc(this._repository) : super(AuthInitial()) {
     on<AuthStarted>(_onStarted);
@@ -19,6 +21,10 @@ class AuthBloc extends Bloc<AuthEvent, AuthState> {
       final refreshToken = await _repository.getRefreshToken();
       if (refreshToken != null) {
         final response = await _repository.refreshSession(refreshToken);
+        _logger.info(
+          message: 'Session refreshed successfully',
+          extra: {'user_id': response.user.id},
+        );
         emit(
           AuthAuthenticated(
             user: AuthUser(id: response.user.id, phone: response.user.phone),
@@ -29,11 +35,20 @@ class AuthBloc extends Bloc<AuthEvent, AuthState> {
       emit(
         const AuthUnauthenticated(reason: AuthUnauthenticatedReason.signedOut),
       );
-    } catch (_) {
+    } catch (e, stackTrace) {
+      _logger.error(
+        message: 'Session refresh failed',
+        error: e,
+        stackTrace: stackTrace,
+      );
       try {
         await _repository.clearSessionLocalOnly();
-      } catch (_) {
-        // Keep state convergence even when storage cleanup fails.
+      } catch (e, stackTrace) {
+        _logger.error(
+          message: 'Failed to clear local session',
+          error: e,
+          stackTrace: stackTrace,
+        );
       } finally {
         emit(
           const AuthUnauthenticated(
@@ -45,6 +60,7 @@ class AuthBloc extends Bloc<AuthEvent, AuthState> {
   }
 
   void _onLoggedIn(AuthLoggedIn event, Emitter<AuthState> emit) {
+    _logger.info(message: 'User logged in', extra: {'user_id': event.user.id});
     emit(AuthAuthenticated(user: event.user));
   }
 
@@ -54,8 +70,13 @@ class AuthBloc extends Bloc<AuthEvent, AuthState> {
   ) async {
     try {
       await _repository.deleteSession();
-    } catch (_) {
-      // Keep state convergence even when logout cleanup fails.
+      _logger.info(message: 'User logged out');
+    } catch (e, stackTrace) {
+      _logger.error(
+        message: 'Failed to delete session on logout',
+        error: e,
+        stackTrace: stackTrace,
+      );
     } finally {
       emit(
         const AuthUnauthenticated(reason: AuthUnauthenticatedReason.signedOut),
@@ -67,10 +88,15 @@ class AuthBloc extends Bloc<AuthEvent, AuthState> {
     AuthSessionInvalidated event,
     Emitter<AuthState> emit,
   ) async {
+    _logger.warning(message: 'Session invalidated by server');
     try {
       await _repository.clearSessionLocalOnly();
-    } catch (_) {
-      // Keep state convergence even when local cleanup fails.
+    } catch (e, stackTrace) {
+      _logger.error(
+        message: 'Failed to clear local session',
+        error: e,
+        stackTrace: stackTrace,
+      );
     } finally {
       emit(
         const AuthUnauthenticated(reason: AuthUnauthenticatedReason.expired),