Renders /@:username and its tabs, /@:username/:tab, and the follow tab's view /@:username/follow/playlists, for anyone. useProfile loads the user, by a former name or another case too, and the URL then takes the current one; each tab loads its own lists, by the user's id, when shown. On their own profile, users edit their avatar, description and email, and create invites. The "manage" tab, another user's role and name, is for those who hold user:manage. A tab or view the profile hasn't is NotFound.