feature(mobile): sync assets, albums & users to local database on device (#1759)

* feature(mobile): sync assets, albums & users to local database on device

* try to fix tests

* move DB sync operations to new SyncService

* clear db on user logout

* fix reason for endless loading timeline

* fix error when deleting album

* fix thumbnail of device albums

* add a few comments

* fix Hive box not open in album service when loading local assets

* adjust tests to int IDs

* fix bug: show all albums when Recent is selected

* update generated api

* reworked Recents album isAll handling

* guard against wrongly interleaved sync operations

* fix: timeline asset ordering (sort asset state by created at)

* fix: sort assets in albums by created at

mobile/lib/utils/builtin_extensions.dart

@@ -5,7 +5,11 @@ extension DurationExtension on String {
     return Duration(hours: parts[0], minutes: parts[1], seconds: parts[2]);
   }
 
-  double? toDouble() {
-    return double.tryParse(this);
+  double toDouble() {
+    return double.parse(this);
+  }
+
+  int toInt() {
+    return int.parse(this);
   }
 }