refactor: app metadata (#28113)

* refactor: app metadata

* refactor to per row store

* cleanup

* more test

* review changes

* more refactor

* refactor

---------

Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>

mobile/lib/domain/models/store.model.dart

@@ -22,7 +22,6 @@ enum StoreKey<T> {
   // user settings from [AppSettingsEnum] below:
   loadPreview<bool>._(100),
   loadOriginal<bool>._(101),
-  themeMode<String>._(102),
   tilesPerRow<int>._(103),
   dynamicLayout<bool>._(104),
   groupAssetsBy<int>._(105),
@@ -35,7 +34,6 @@ enum StoreKey<T> {
   albumThumbnailCacheSize<int>._(112),
   selectedAlbumSortOrder<int>._(113),
   advancedTroubleshooting<bool>._(114),
-  logLevel<int>._(115),
   preferRemoteImage<bool>._(116),
   loopVideo<bool>._(117),
   // map related settings
@@ -94,7 +92,11 @@ enum StoreKey<T> {
   cleanupCutoffDaysAgo<int>._(1011),
   cleanupDefaultsInitialized<bool>._(1012),
 
-  syncMigrationStatus<String>._(1013);
+  syncMigrationStatus<String>._(1013),
+
+  // Legacy keys that have been migrated to the new metadata store
+  legacyThemeMode<String>._(102),
+  legacyLogLevel<int>._(115);
 
   const StoreKey._(this.id);
   final int id;