A shorter title bar, and a build approval that lasts

[aodjo]

Three small things, two of them about how much of the window the title bar takes.

The title bar is drawn compact, and its controls at the size of the text beside them rather
than the size a toolbar gives them by default. Every point saved above the picture is a point
of the far machine's screen, and these controls are recognised by shape rather than read.

A build approval lasts as long as signing in does. An hour sounded like a run of builds
until a day went on one problem: the browser opened again every hour to ask about something
already answered, and an approval asked for that often is one nobody reads before clicking.
What makes the length safe is not the length — the session shows in the dashboard and can be
ended there immediately, which is sooner than any expiry.

That session is still an operator session in the other sense too: everything an operator may
do, it may do. Scoping it to the build endpoints is worth doing and is not done here; the
constant carries a note saying so.

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