add prompt confirmation and update carton

lib/domain/entities/package.dart

@@ -131,6 +131,12 @@ class Package {
         currentStatusDate: DateTime.parse(json['status_date']));
   }
 
+  bool isChangedForEdit(Package package) {
+    return package.trackingID != this.trackingID ||
+        package.remark != this.remark ||
+        package.fcsID != this.fcsID;
+  }
+
   @override
   bool operator ==(Object other) => other is Package && other.id == id;