Effective person select
The effective person feature should allow to switch the person context (e. g. as guardian for children or as administrator for arbitrary users). Currently, this shall allow access to all views with all permissions in the context of the person.
- The feature should be displayed globally.
- The information is stored in the session and provided via a GraphQL query.
- If a person other than the own is selected, a highly visible notice has to be shown (idea: colored area directly under the nav bar including an icon and "back to my person" button)
- The position of the select should be in the account menu.