Answers mara's question on PR#3342 (lightweight dep for fmtAgo?): no
dep needed, Intl.RelativeTimeFormat is built into the runtime and its
narrow style produces the same '5m ago' shape, verified with a real
call rather than assumed from the spec.
App.tsx now fetches GET /api/hives/status (the swarm-controller
aggregate: one row per roster hive, freshness derived at read time
from the status bucket) instead of GET /api/hives + a static
'configured' chip. Renders fresh/stale/never_reported/unknown as
StatusChip tones with a relative age, per the placeholder comment that
was already waiting on this endpoint to exist.
Adds a small local fmtAgo helper (src/util.ts) mirroring the
dashboard package's near-identical formatter — not worth sharing
across a vanilla-JS and a Preact/TS call site.
