Wrap long names on phones

A ref label, email address or path longer than a phone screen pushed
main.content sideways by up to 340px. In the log and summary the label
also widened the shared table until the age column left the screen.

Below 640px a label becomes an inline-block capped at its cell, so it
still moves to the next line whole and breaks inside only when it is
wider than the cell. line-height: normal keeps the box the height of
the inline label it replaces. That holds exactly in Chromium and
Firefox, while WebKit's box grows by a third of a pixel at each edge.
Commit details and diffstat paths break at the cell edge, as listing
cells already do.

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