feat(App): update Finlytic Flutter app UI and blocs

FinlyticApp/lib/features/favorites/bloc/favorites_bloc.dart

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+import 'dart:async';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:finlytic_app/features/favorites/repositories/favorites_repository.dart';
+import 'favorites_event.dart';
+import 'favorites_state.dart';
+
+class FavoritesBloc extends Bloc<FavoritesEvent, FavoritesState> {
+  final FavoritesRepository repository;
+
+  FavoritesBloc({required this.repository}) : super(FavoritesInitial()) {
+    on<LoadFavorites>(_onLoadFavorites);
+  }
+
+  Future<void> _onLoadFavorites(LoadFavorites event, Emitter<FavoritesState> emit) async {
+    emit(FavoritesLoading());
+    try {
+      final favorites = await repository.fetchFavoritesDetails(event.symbols);
+      emit(FavoritesLoaded(favorites));
+    } catch (e) {
+      emit(const FavoritesError("Fehler beim Laden der Favoriten."));
+    }
+  }
+}

FinlyticApp/lib/features/favorites/bloc/favorites_event.dart

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+import 'package:equatable/equatable.dart';
+
+abstract class FavoritesEvent extends Equatable {
+  const FavoritesEvent();
+
+  @override
+  List<Object?> get props => [];
+}
+
+class LoadFavorites extends FavoritesEvent {
+  final List<String> symbols;
+
+  const LoadFavorites(this.symbols);
+
+  @override
+  List<Object?> get props => [symbols];
+}

FinlyticApp/lib/features/favorites/bloc/favorites_state.dart

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+import 'package:equatable/equatable.dart';
+import 'package:finlytic_app/features/favorites/models/favorite_asset_model.dart';
+
+abstract class FavoritesState extends Equatable {
+  const FavoritesState();
+
+  @override
+  List<Object?> get props => [];
+}
+
+class FavoritesInitial extends FavoritesState {}
+
+class FavoritesLoading extends FavoritesState {}
+
+class FavoritesLoaded extends FavoritesState {
+  final List<FavoriteAssetModel> favorites;
+
+  const FavoritesLoaded(this.favorites);
+
+  @override
+  List<Object?> get props => [favorites];
+}
+
+class FavoritesError extends FavoritesState {
+  final String message;
+
+  const FavoritesError(this.message);
+
+  @override
+  List<Object?> get props => [message];
+}