The dashboard's top-of-page warning banner is gone. The warning registry
stays, because /health/ready, the swarm status view and the OTEL gauges
read it. What it feeds is now alerted on in Grafana:
- hyperhive.hive.warning{kind,level}: one series per raised warning, so an
alert names the cause. Raising a warning also logs one `hive warning
raised` line with the message.
- hyperhive.hive.nix_store.utilization: the used fraction of the nix
store's filesystem, probed in the gauge callback.
- Alerts: hh-hive-degraded on the existing degraded gauge, hh-hive-warning
per kind (disk excluded), hh-host-disk-high at 85% and
hh-host-disk-critical at 95%.
- pending_logins is now a registry warning, refreshed from the container
rescan, so it reaches the per-kind gauge.
Frontend: server_warnings leaves the state snapshot, and the dashboard,
flow and stats pages keep only the sticky chrome wrapper. The shared
hive-warn and WarnBanner components stay, since other views use them.
A module-eval case checks each alert's metric name against the exporter's
source, so a rename on either side fails the build.
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