cleanup code

lib/pages/invoice/box_addition.dart

@@ -1,11 +1,9 @@
 import 'package:fcs/domain/entities/carton.dart';
 import 'package:fcs/helpers/theme.dart';
 import 'package:fcs/localization/app_translations.dart';
-import 'package:fcs/pages/carton/model/carton_model.dart';
 import 'package:fcs/pages/widgets/progress.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
-import 'package:provider/provider.dart';
 
 class BoxAddition extends StatefulWidget {
   final Carton? box;
@@ -16,25 +14,10 @@ class BoxAddition extends StatefulWidget {
 }
 
 class _BoxAdditionState extends State<BoxAddition> {
-  Carton _box = new Carton();
   bool _isLoading = false;
 
-  @override
-  void initState() {
-    super.initState();
-    if (widget.box != null) {
-      _box = widget.box!;
-    }
-  }
-
-  @override
-  void dispose() {
-    super.dispose();
-  }
-
   @override
   Widget build(BuildContext context) {
-    var boxModel = Provider.of<CartonModel>(context);
     return LocalProgress(
       inAsyncCall: _isLoading,
       child: Scaffold(