feat: add alot

lib/viewmodels/history_view_model.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/foundation.dart';
 
+import '../models/app_error.dart';
 import '../models/bar_tab.dart';
 import '../models/closed_tab.dart';
 import '../services/bar_tab_service.dart';
@@ -20,7 +21,7 @@ class HistoryViewModel extends ChangeNotifier {
   bool _isLoading = false;
   bool _hasLoaded = false;
   bool _isLoadingMore = false;
-  String? _errorMessage;
+  AppError? _error;
   String _searchQuery = '';
 
   List<ClosedTab> get closedTabs {
@@ -47,7 +48,7 @@ class HistoryViewModel extends ChangeNotifier {
 
   bool get hasMore => _closedTabs.length < _totalCount;
 
-  String? get errorMessage => _errorMessage;
+  AppError? get error => _error;
 
   Future<void> ensureLoaded() async {
     if (_hasLoaded || _isLoading) return;
@@ -59,7 +60,7 @@ class HistoryViewModel extends ChangeNotifier {
     if (_isLoading) return;
 
     _isLoading = true;
-    _errorMessage = null;
+    _error = null;
     notifyListeners();
 
     try {
@@ -81,7 +82,7 @@ class HistoryViewModel extends ChangeNotifier {
       _offset = _closedTabs.length;
     } catch (e) {
       debugPrint('HistoryViewModel: load error: $e');
-      _errorMessage = 'Could not load tab history.';
+      _error = AppError.loadHistory;
     } finally {
       _hasLoaded = true;
       _isLoading = false;
@@ -101,7 +102,7 @@ class HistoryViewModel extends ChangeNotifier {
       _offset = _closedTabs.length;
     } catch (e) {
       debugPrint('HistoryViewModel: loadMore error: $e');
-      _errorMessage = 'Could not load more tabs.';
+      _error = AppError.loadMoreTabs;
     } finally {
       _isLoadingMore = false;
       notifyListeners();