refactor(mobile): entities and models (#9182)

* refactor(mobile): entities

* store entity

* refactor: models

* remove domain

* save all

* bad refactor

mobile/lib/models/asset_viewer/asset_viewer_page_state.model.dart

@@ -0,0 +1,55 @@
+import 'dart:convert';
+
+enum DownloadAssetStatus { idle, loading, success, error }
+
+class AssetViewerPageState {
+  // enum
+  final DownloadAssetStatus downloadAssetStatus;
+
+  AssetViewerPageState({
+    required this.downloadAssetStatus,
+  });
+
+  AssetViewerPageState copyWith({
+    DownloadAssetStatus? downloadAssetStatus,
+  }) {
+    return AssetViewerPageState(
+      downloadAssetStatus: downloadAssetStatus ?? this.downloadAssetStatus,
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    final result = <String, dynamic>{};
+
+    result.addAll({'downloadAssetStatus': downloadAssetStatus.index});
+
+    return result;
+  }
+
+  factory AssetViewerPageState.fromMap(Map<String, dynamic> map) {
+    return AssetViewerPageState(
+      downloadAssetStatus:
+          DownloadAssetStatus.values[map['downloadAssetStatus'] ?? 0],
+    );
+  }
+
+  String toJson() => json.encode(toMap());
+
+  factory AssetViewerPageState.fromJson(String source) =>
+      AssetViewerPageState.fromMap(json.decode(source));
+
+  @override
+  String toString() =>
+      'ImageViewerPageState(downloadAssetStatus: $downloadAssetStatus)';
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+
+    return other is AssetViewerPageState &&
+        other.downloadAssetStatus == downloadAssetStatus;
+  }
+
+  @override
+  int get hashCode => downloadAssetStatus.hashCode;
+}