feat(mobile): Library page rework (album sorting, favorites) (#1501)

* Add album sorting

* Change AppBar to match photos page behaviour

* Add buttons

* First crude implementation of the favorites page

* Clean up

* Add favorite button

* i18n

* Add star indicator to thumbnail

* Add favorite logic to separate provider and fix favorite behavior in album

* Review feedback (Add isFavorite variable)

* dev: style buttons

* dev: styled drop down button

---------

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

mobile/test/asset_grid_data_structure_test.dart

@@ -20,6 +20,7 @@ void main() {
         modifiedAt: date,
         durationInSeconds: 0,
         fileName: '',
+        isFavorite: false,
       ),
     );
   }