Possession

US: As a SUPERUSER user I want to change my session to someone I select from a list to see how they might see the admin panel or the frontend.

AC:
- Have an option to "possess" users.
- Make sure the audit log shows the real user (eg. User Admin - as Possessed User)
- Have an option to change it back to the original user
- Optional: Have an option for regular admins to use it if they have the right somehow.

NOTE:
Might want to create a new User for that.

Start with the admin-panel/frontend user-selection flow, session handling, and audit-log entry points; the issue names no files or tests. Define the possession and return flows, access rules, and audit identity behavior against the acceptance criteria, including whether regular-admin access and a separate User are in scope.

Written by the indexing model from the issue text.