Closes#3460.
Renamed for accuracy — the page/nav item is the hive roster, not a
general dashboard overview. Nav label, page title, component name,
and file all renamed together so the internal name doesn't drift from
what's displayed (a component still called OverviewPage under a
'hives' nav label would be exactly the kind of stale prior-art that
makes the next contributor search harder, not less).
537d6f9dac