update cargo type form from rate, update carton info and form

lib/pages/carton/mix_carton/mix_carton_form.dart

@@ -1,5 +1,6 @@
 // ignore_for_file: deprecated_member_use
 
+import 'package:fcs/pages/carton/model/carton_model.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:intl/intl.dart';
@@ -187,7 +188,35 @@ class _MixCartonFormState extends State<MixCartonForm> {
       _isLoading = true;
     });
     try {
-      Navigator.pop(context, true);
+      double length = 0;
+      double width = 0;
+      double height = 0;
+
+      if (_cartonSizeType == standardCarton) {
+        if (_standardSize != null) {
+          length = _standardSize!.length;
+          width = _standardSize!.width;
+          height = _standardSize!.height;
+        }
+      } else if (_cartonSizeType == customCarton) {
+        length = _length;
+        width = _width;
+        height = _height;
+      } else {
+        length = 0;
+        width = 0;
+        height = 0;
+      }
+
+      var carton = Carton(
+          cartonType: mix_carton,
+          fcsShipmentID: _shipment?.id,
+          length: length,
+          width: width,
+          height: height,
+          cartons: _cartons);
+      var c = await context.read<CartonModel>().createMixCarton(carton);
+      Navigator.pop(context, c);
     } catch (e) {
       showMsgDialog(context, "Error", e.toString());
     } finally {