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

FinlyticApp/lib/features/asset_detail/bloc/header/asset_header_bloc.dart

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+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'asset_header_event.dart';
+import 'asset_header_state.dart';
+import '../../repositories/asset_repository.dart';
+
+class AssetHeaderBloc extends Bloc<AssetHeaderEvent, AssetHeaderState> {
+  final AssetRepository repository;
+  AssetHeaderBloc({required this.repository}) : super(AssetHeaderInitial()) {
+    on<LoadAssetHeader>((event, emit) async {
+      final prevData = state is AssetHeaderLoaded ? (state as AssetHeaderLoaded).data : (state is AssetHeaderLoading ? (state as AssetHeaderLoading).previousData : null);
+      emit(AssetHeaderLoading(previousData: prevData));
+      try {
+        final data = await repository.getAssetHeader(event.isin, exchange: event.exchange, ticker: event.ticker);
+        emit(AssetHeaderLoaded(data));
+      } catch (e) {
+        emit(AssetHeaderError(e.toString()));
+      }
+    });
+  }
+}

FinlyticApp/lib/features/asset_detail/bloc/header/asset_header_event.dart

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+abstract class AssetHeaderEvent {}
+class LoadAssetHeader extends AssetHeaderEvent {
+  final String isin;
+  final bool forceRefresh;
+  final String? exchange;
+  final String? ticker;
+  LoadAssetHeader(this.isin, {this.forceRefresh = false, this.exchange, this.ticker});
+}

FinlyticApp/lib/features/asset_detail/bloc/header/asset_header_state.dart

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+import '../../models/asset_model.dart';
+
+abstract class AssetHeaderState {}
+class AssetHeaderInitial extends AssetHeaderState {}
+class AssetHeaderLoading extends AssetHeaderState {
+  final AssetModel? previousData;
+  AssetHeaderLoading({this.previousData});
+}
+class AssetHeaderLoaded extends AssetHeaderState {
+  final AssetModel? data;
+  AssetHeaderLoaded(this.data);
+}
+class AssetHeaderError extends AssetHeaderState {
+  final String message;
+  AssetHeaderError(this.message);
+}