added validity for reusing space name in same layer

lib/pages/spaces_management/widgets/community_structure_widget.dart

@@ -270,6 +270,7 @@ class _CommunityStructureAreaState extends State<CommunityStructureArea> {
       builder: (BuildContext context) {
         return CreateSpaceDialog(
           products: widget.products,
+          parentSpace: parentIndex != null? spaces[parentIndex] : null,
           onCreateSpace: (String name, String icon, List<SelectedProduct> selectedProducts) {
             setState(() {
               // Set the first space in the center or use passed position