* fix(plex): do not fail to import Plex users when Plex Home has managed users
* fix: default display name to email when user has no username
also, do not set username or plexUsername when it is the same as the user's email address
* fix(ui): user display name placeholder should reflect fallback logic if username is not set
* fix(ui): hide email addresses of other users if logged-in user does not have Manage Users permission
* fix: always set Plex username even if same as user's email
* fix: remove unnecessary permission check
* fix: transform email addresses to lowercase
310cdb36df