Добавил классы для хранения лайков

lib/presentation/like/bloc.dart

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+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:pmu/presentation/like/state.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import 'events.dart';
+
+const String _likedPrefsKey = 'liked';
+
+class LikeBloc extends Bloc<LikeEvent, LikeState> {
+  LikeBloc() : super(const LikeState(likedIds: [])) {
+    on<ChangeLikeEvent>(_onChangeLike);
+    on<LoadLikesEvent>(_onLoadLikes);
+  }
+
+  Future<void> _onLoadLikes(
+      LoadLikesEvent event, Emitter<LikeState> emit) async {
+    final prefs = await SharedPreferences.getInstance();
+    final data = prefs.getStringList(_likedPrefsKey);
+
+    emit(state.copyWith(likedIds: data));
+  }
+
+  Future<void> _onChangeLike(
+      ChangeLikeEvent event, Emitter<LikeState> emit) async {
+    final updatedList = List<String>.from(state.likedIds ?? []);
+
+    if (updatedList.contains(event.id)) {
+      updatedList.remove(event.id);
+    } else {
+      updatedList.add(event.id);
+    }
+
+    final prefs = await SharedPreferences.getInstance();
+    prefs.setStringList(_likedPrefsKey, updatedList);
+
+    emit(state.copyWith(likedIds: updatedList));
+  }
+}

lib/presentation/like/events.dart

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+abstract class LikeEvent {
+  const LikeEvent();
+}
+
+class LoadLikesEvent extends LikeEvent {
+  const LoadLikesEvent();
+}
+
+class ChangeLikeEvent extends LikeEvent {
+  final String id;
+
+  const ChangeLikeEvent(this.id);
+}

lib/presentation/like/state.dart

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+import 'package:copy_with_extension/copy_with_extension.dart';
+import 'package:equatable/equatable.dart';
+
+part 'state.g.dart';
+
+@CopyWith()
+class LikeState extends Equatable {
+  final List<String>? likedIds;
+
+  const LikeState({required this.likedIds});
+
+  @override
+  List<Object?> get props => [likedIds];
+}

lib/presentation/like/state.g.dart

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+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'state.dart';
+
+// **************************************************************************
+// CopyWithGenerator
+// **************************************************************************
+
+abstract class _$LikeStateCWProxy {
+  LikeState likedIds(List<String>? likedIds);
+
+  /// This function **does support** nullification of nullable fields. All `null` values passed to `non-nullable` fields will be ignored. You can also use `LikeState(...).copyWith.fieldName(...)` to override fields one at a time with nullification support.
+  ///
+  /// Usage
+  /// ```dart
+  /// LikeState(...).copyWith(id: 12, name: "My name")
+  /// ````
+  LikeState call({
+    List<String>? likedIds,
+  });
+}
+
+/// Proxy class for `copyWith` functionality. This is a callable class and can be used as follows: `instanceOfLikeState.copyWith(...)`. Additionally contains functions for specific fields e.g. `instanceOfLikeState.copyWith.fieldName(...)`
+class _$LikeStateCWProxyImpl implements _$LikeStateCWProxy {
+  const _$LikeStateCWProxyImpl(this._value);
+
+  final LikeState _value;
+
+  @override
+  LikeState likedIds(List<String>? likedIds) => this(likedIds: likedIds);
+
+  @override
+
+  /// This function **does support** nullification of nullable fields. All `null` values passed to `non-nullable` fields will be ignored. You can also use `LikeState(...).copyWith.fieldName(...)` to override fields one at a time with nullification support.
+  ///
+  /// Usage
+  /// ```dart
+  /// LikeState(...).copyWith(id: 12, name: "My name")
+  /// ````
+  LikeState call({
+    Object? likedIds = const $CopyWithPlaceholder(),
+  }) {
+    return LikeState(
+      likedIds: likedIds == const $CopyWithPlaceholder()
+          ? _value.likedIds
+          // ignore: cast_nullable_to_non_nullable
+          : likedIds as List<String>?,
+    );
+  }
+}
+
+extension $LikeStateCopyWith on LikeState {
+  /// Returns a callable class that can be used as follows: `instanceOfLikeState.copyWith(...)` or like so:`instanceOfLikeState.copyWith.fieldName(...)`.
+  // ignore: library_private_types_in_public_api
+  _$LikeStateCWProxy get copyWith => _$LikeStateCWProxyImpl(this);
+}