* fix: use lock to synchronise foreground and background backup
# Conflicts:
# mobile/lib/domain/services/background_worker.service.dart
# mobile/lib/platform/background_worker_api.g.dart
# mobile/pigeon/background_worker_api.dart
* add timeout to the splash-screen acquire lock
* fix: null check on created date
---------
Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>
Co-authored-by: Alex <alex.tran1502@gmail.com>
