Drop the H0M3 tile hub and the core page. The dashboard is now the index;
kept state is its fifth tab. A pages menu in the chrome links flow, stats,
API docs and the swarm UI. The swarm apex URL comes from
services.hyperhive.swarm.domain via HIVE_SWARM_PUBLIC_URL and the new
swarm_public_url field of the state snapshot.
The rain read only the OS reduced-motion query, once, at mount. The settings
menu's motion override (data-motion on the document) wins over the OS in
either direction everywhere else, and the shell applies it from an effect
that runs after this one. Whether the rain may move is now rainAllowed(), and
the component re-evaluates it on mount, on every document attribute change
and on the media query's change, starting or stopping the interval and
clearing the canvas.
The rain's column maths and fade colour move from MatrixRain into
shell/rain.ts, and the request-once swarm name loader from useSwarmName
into shell/swarm-name.ts. Both are plain functions with their input
passed in, so tests cover them; the components keep the DOM and canvas
work.
/ 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
