close method
Closes the underlying Hive box.
Call this when you're done with the store to release resources. After closing, the store cannot be used anymore.
This method is idempotent: calling it on an already-closed store is a no-op and will not throw.
Example:
await store.close();
Implementation
Future<void> close() async {
if (!_box.isOpen) return;
await _box.close();
}