* Fix error on close due to context differences in background
Desktop background does not have active user information. Also, we want to delete _all_ prompt cancelled data, not just that for the active user. Storing this on global and manipulating observables to active achieves this without needing any user information in the background.
* Remove potentially orphaned data
* Throw nice error if prompt cancelled used without active user
* Register migration
* split prompt cancelled reset to user-specific and global