Add time user was last active on user search.

For example distinguish user activity by stating last active <1MO ago, <1YR ago, <10years ago, so you roughly know if that user account is current or being used when adding users or looking a user up

Start by locating the user search and user lookup entry points in the iOS app, then check whether a user's last-active timestamp is already available from the data source. Done means search results or user lookup show a readable relative value such as “<1MO ago,” “<1YR ago,” or “<10 years ago” when activity data exists.

Written by the indexing model from the issue text.