The hives nav tab and route go, with no redirect; the roster is a card above
the agents panel that starts folded and is read on the first open. The
settings toggle is renamed from hide debug output to hide developer details,
as it now also drops the components tab (the page still answers at
/components); the stored preference keeps its key.
/ is now the swarm's name over the digital-rain backdrop the hive
dashboard's home has, and the swarm name in the header links to it. The
hive directory moves to /hives, where the nav's hives tab points. The
swarm name is read once per page load by a shared hook, the header and
the start page both use it. Closes#5252
