feat(content_management): add country data to create headline state

- Add countriesRepository to CreateHeadlineBloc constructor
- Fetch countries data in _onDataLoaded event handler
- Store countries in CreateHeadlineState
- Update imports to include Country model

Author: fulleni

lib/content_management/bloc/create_headline/create_headline_bloc.dart

@@ -1,6 +1,5 @@
 import 'package:bloc/bloc.dart';
 import 'package:core/core.dart';
-import 'package:country_picker/country_picker.dart' as picker;
 import 'package:data_repository/data_repository.dart';
 import 'package:equatable/equatable.dart';
 import 'package:flutter/foundation.dart';
@@ -18,10 +17,12 @@ class CreateHeadlineBloc
     required DataRepository<Headline> headlinesRepository,
     required DataRepository<Source> sourcesRepository,
     required DataRepository<Topic> topicsRepository,
-  }) : _headlinesRepository = headlinesRepository,
-       _sourcesRepository = sourcesRepository,
-       _topicsRepository = topicsRepository,
-       super(const CreateHeadlineState()) {
+    required DataRepository<Country> countriesRepository,
+  })  : _headlinesRepository = headlinesRepository,
+        _sourcesRepository = sourcesRepository,
+        _topicsRepository = topicsRepository,
+        _countriesRepository = countriesRepository,
+        super(const CreateHeadlineState()) {
     on<CreateHeadlineDataLoaded>(_onDataLoaded);
     on<CreateHeadlineTitleChanged>(_onTitleChanged);
     on<CreateHeadlineExcerptChanged>(_onExcerptChanged);
@@ -37,6 +38,7 @@ class CreateHeadlineBloc
   final DataRepository<Headline> _headlinesRepository;
   final DataRepository<Source> _sourcesRepository;
   final DataRepository<Topic> _topicsRepository;
+  final DataRepository<Country> _countriesRepository;
   final _uuid = const Uuid();
 
   Future<void> _onDataLoaded(
@@ -48,23 +50,30 @@ class CreateHeadlineBloc
       final [
         sourcesResponse,
         topicsResponse,
+        countriesResponse,
       ] = await Future.wait([
         _sourcesRepository.readAll(
           sort: [const SortOption('updatedAt', SortOrder.desc)],
         ),
         _topicsRepository.readAll(
           sort: [const SortOption('updatedAt', SortOrder.desc)],
         ),
+        _countriesRepository.readAll(
+          sort: [const SortOption('name', SortOrder.asc)],
+        ),
       ]);
 
       final sources = (sourcesResponse as PaginatedResponse<Source>).items;
       final topics = (topicsResponse as PaginatedResponse<Topic>).items;
+      final countries =
+          (countriesResponse as PaginatedResponse<Country>).items;
 
       emit(
         state.copyWith(
           status: CreateHeadlineStatus.initial,
           sources: sources,
           topics: topics,
+          countries: countries,
         ),
       );
     } on HttpException catch (e) {