feat(mobile): lazy loading of assets (#2413)

mobile/lib/modules/album/models/asset_selection_page_result.model.dart

@@ -2,47 +2,20 @@ import 'package:collection/collection.dart';
 import 'package:immich_mobile/shared/models/asset.dart';
 
 class AssetSelectionPageResult {
-  final Set<Asset> selectedNewAsset;
-  final Set<Asset> selectedAdditionalAsset;
-  final bool isAlbumExist;
+  final Set<Asset> selectedAssets;
 
   AssetSelectionPageResult({
-    required this.selectedNewAsset,
-    required this.selectedAdditionalAsset,
-    required this.isAlbumExist,
+    required this.selectedAssets,
   });
-
-  AssetSelectionPageResult copyWith({
-    Set<Asset>? selectedNewAsset,
-    Set<Asset>? selectedAdditionalAsset,
-    bool? isAlbumExist,
-  }) {
-    return AssetSelectionPageResult(
-      selectedNewAsset: selectedNewAsset ?? this.selectedNewAsset,
-      selectedAdditionalAsset:
-          selectedAdditionalAsset ?? this.selectedAdditionalAsset,
-      isAlbumExist: isAlbumExist ?? this.isAlbumExist,
-    );
-  }
-
-  @override
-  String toString() =>
-      'AssetSelectionPageResult(selectedNewAsset: $selectedNewAsset, selectedAdditionalAsset: $selectedAdditionalAsset, isAlbumExist: $isAlbumExist)';
-
   @override
   bool operator ==(Object other) {
     if (identical(this, other)) return true;
     final setEquals = const DeepCollectionEquality().equals;
 
     return other is AssetSelectionPageResult &&
-        setEquals(other.selectedNewAsset, selectedNewAsset) &&
-        setEquals(other.selectedAdditionalAsset, selectedAdditionalAsset) &&
-        other.isAlbumExist == isAlbumExist;
+        setEquals(other.selectedAssets, selectedAssets);
   }
 
   @override
-  int get hashCode =>
-      selectedNewAsset.hashCode ^
-      selectedAdditionalAsset.hashCode ^
-      isAlbumExist.hashCode;
+  int get hashCode => selectedAssets.hashCode;
 }