add prompt confirmation and update carton

lib/domain/entities/processing.dart

@@ -29,6 +29,12 @@ class Processing {
   @override
   int get hashCode => id.hashCode;
 
+  bool isChangedForEdit(Processing processing) {
+    return processing.userID != this.userID ||
+        processing.fcsID != this.fcsID ||
+        processing.packages != this.packages;
+  }
+
   @override
   String toString() {
     return 'Processing{id: $id}';