Add factory method empty to SpaceModel for default instance creation. Refactor SpaceDetailsDialog and related widgets to utilize SpaceModel, enhancing parameter handling and state management in space creation and editing flows.

lib/pages/space_management_v2/modules/communities/domain/models/space_model.dart

@@ -19,6 +19,16 @@ class SpaceModel extends Equatable {
     required this.parent,
   });
 
+  factory SpaceModel.empty() => const SpaceModel(
+        uuid: '',
+        createdAt: null,
+        updatedAt: null,
+        spaceName: '',
+        icon: '',
+        children: [],
+        parent: null,
+      );
+
   factory SpaceModel.fromJson(Map<String, dynamic> json) {
     return SpaceModel(
       uuid: json['uuid'] as String? ?? '',