feat(mobile): slideshow view (#28421)

* feat(mobile): slideshow view

* move slideshow settings to metadata store

* remove watch in initState

* wrap progress bar in safearea

* show slideshow button on remote albums

* fix crash on unknown assets

* always show slideshow option

* add zoom effect

* add padding to slideshow settings

* chore: styling tweak

---------

Co-authored-by: Alex <alex.tran1502@gmail.com>

mobile/lib/domain/models/metadata_key.dart

@@ -64,7 +64,19 @@ enum MetadataKey<T extends Object> {
   ),
   cleanupKeepAlbumIds<List<String>>(.appConfig, 'cleanup.keepAlbumIds', [], _ListCodec(_PrimitiveCodec.string)),
   cleanupCutoffDaysAgo<int>(.appConfig, 'cleanup.cutoffDaysAgo', -1),
-  cleanupDefaultsInitialized<bool>(.appConfig, 'cleanup.defaultsInitialized', false);
+  cleanupDefaultsInitialized<bool>(.appConfig, 'cleanup.defaultsInitialized', false),
+
+  // Slideshow
+  slideshowTransition<bool>(.appConfig, 'slideshow.transition', true),
+  slideshowRepeat<bool>(.appConfig, 'slideshow.repeat', true),
+  slideshowDuration<int>(.appConfig, 'slideshow.duration', 5),
+  slideshowLook<SlideshowLook>(.appConfig, 'slideshow.look', SlideshowLook.contain, _EnumCodec(SlideshowLook.values)),
+  slideshowDirection<SlideshowDirection>(
+    .appConfig,
+    'slideshow.direction',
+    SlideshowDirection.forward,
+    _EnumCodec(SlideshowDirection.values),
+  );
 
   final MetadataDomain domain;
   final String name;