Non-admin sessions cannot read GET /api/system/settings, so the Settings
General Monitoring Cadence card fell back to the Realtime (10s) preset
regardless of the configured interval; an issue #1601 reporter read that
as the server polling faster for non-admins. Publish the effective
pvePollingInterval on the authenticated runtime-display projection
(runtime config first, persisted value only as fallback, matching the
admin route's precedence), consume it in the viewer fallback of the
settings state, and run that initialization for sessions without
infrastructureRead too, whose ungated General panel previously never
initialized presentation state at all.
rcourtman