* [wip] Add user data cleanup service
* Add clean-up report viewer
* Fix review comments
* Add function comments
* Implement item actions
* Fix UI styles
* Add placeholder for empty results, update category description view
* Add displayEmptyPlaceholder method to show message when results list is empty
* Adjust menu buttons row
* Delete char-scoped data bank attachments on character deletion
* Data Bank: Handle character attachments on rename
* Remove line breaks in description strings
* Drop the category when the last item is deleted
* Skip invalid hashes instead of bailing
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