login: a token asked to live less ends its session with it

Review finding 8, first part: a refreshed token's lifetime came from
the refresh request, and it kept the session's end. So the five-minute
read-all token a dashboard hands to another member's refreshed into a
12-hour one, renewable for seven days.

A token asked to live less (`lifetime`, at login or refresh) now ends
its session with it: nobody refreshes it past its end, its holder
included, and a session begun from it (POST /auth/session) ends then
too.

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