refa: article (#757)

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

lib/models/dynamics/opus_detail/size_spec.dart

@@ -0,0 +1,16 @@
+class SizeSpec {
+  num? height;
+  num? width;
+
+  SizeSpec({this.height, this.width});
+
+  factory SizeSpec.fromJson(Map<String, dynamic> json) => SizeSpec(
+        height: json['height'],
+        width: json['width'],
+      );
+
+  Map<String, dynamic> toJson() => {
+        'height': height,
+        'width': width,
+      };
+}