opt models

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/models_new/space/space/size_spec.dart

@@ -0,0 +1,11 @@
+class SizeSpec {
+  double? width;
+  double? height;
+
+  SizeSpec({this.width, this.height});
+
+  factory SizeSpec.fromJson(Map<String, dynamic> json) => SizeSpec(
+        width: (json['width'] as num?)?.toDouble(),
+        height: (json['height'] as num?)?.toDouble(),
+      );
+}