style(mobile): asset selection animation (#5322)

* refactor: replace navigator.pop with context.pop

* mobile: use demo instance credentials for test login

* style(mobile): centre align add partner button

* mobile: add thumbnail selection animation

* differnt gesture for test instance

---------

Co-authored-by: shalong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>
Co-authored-by: Alex Tran <alex.tran1502@gmail.com>

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

@@ -27,7 +27,7 @@ class AlbumOptionsPage extends HookConsumerWidget {
     final isOwner = owner?.id == userId;
 
     void showErrorMessage() {
-      Navigator.pop(context);
+      context.pop();
       ImmichToast.show(
         context: context,
         msg: "shared_album_section_people_action_error".tr(),
@@ -70,7 +70,7 @@ class AlbumOptionsPage extends HookConsumerWidget {
         showErrorMessage();
       }
 
-      Navigator.pop(context);
+      context.pop();
       ImmichLoadingOverlayController.appLoader.hide();
     }