feat(mobile): show local assets (#905)

* introduce Asset as composition of AssetResponseDTO and AssetEntity

* filter out duplicate assets (that are both local and remote, take only remote for now)

* only allow remote images to be added to albums

* introduce ImmichImage to render Asset using local or remote data

* optimized deletion of local assets

* local video file playback

* allow multiple methods to wait on background service finished

* skip local assets when adding to album from home screen

* fix and optimize delete

* show gray box placeholder for local assets

* add comments

* fix bug: duplicate assets in state after onNewAssetUploaded

mobile/lib/modules/album/views/create_album_page.dart

@@ -166,7 +166,7 @@ class CreateAlbumPage extends HookConsumerWidget {
                 return GestureDetector(
                   onTap: _onBackgroundTapped,
                   child: SharedAlbumThumbnailImage(
-                    asset: selectedAssets.toList()[index],
+                    asset: selectedAssets.elementAt(index),
                   ),
                 );
               },