add carton editor for package

lib/app.dart

@@ -30,6 +30,7 @@ import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:provider/provider.dart';
 
 import 'pages/carton/model/carton_selection_model.dart';
+import 'pages/carton/model/package_selection_model.dart';
 import 'pages/delivery/model/delivery_model.dart';
 
 class App extends StatefulWidget {
@@ -64,6 +65,7 @@ class _AppState extends State<App> {
   final ProcessingModel processingModel = new ProcessingModel();
   final PickupModel pickupModel = new PickupModel();
   final CartonSelectionModel cartonSelectionModel = new CartonSelectionModel();
+  final PackageSelectionModel packageSelectionModel = new PackageSelectionModel();
 
   late AppTranslationsDelegate _newLocaleDelegate;
 
@@ -87,7 +89,8 @@ class _AppState extends State<App> {
       ..addModel(cartonSizeModel)
       ..addModel(processingModel)
       ..addModel(pickupModel)
-      ..addModel(cartonSelectionModel);
+      ..addModel(cartonSelectionModel)
+      ..addModel(packageSelectionModel);
 
     _newLocaleDelegate = AppTranslationsDelegate(
         newLocale: Translation().supportedLocales().first);
@@ -137,6 +140,7 @@ class _AppState extends State<App> {
           ChangeNotifierProvider.value(value: processingModel),
           ChangeNotifierProvider.value(value: pickupModel),
           ChangeNotifierProvider.value(value: cartonSelectionModel),
+          ChangeNotifierProvider.value(value: packageSelectionModel),
         ],
         child: Consumer<LanguageModel>(
           builder: (context, value, child) {