The live region announced the advisory and steering state on every
change, but a failed or invalid poll only set the visible status to
offline. The live region kept the last known message, so during an
outage a screen-reader user could still hear "No steering is required"
from a poll that had already failed. That is worse than silence,
because stale guidance reads as current.
Route announcements through a single helper and have the failure path
replace the guidance with a message saying the data is unavailable and
the counts are unknown. The helper still suppresses a repeat of the
same message, so a continuing outage stays quiet and recovery speaks
again.
Cover the success then failure and failure then recovery sequences at
runtime. Reverting just the failure-path announcement fails the new
assertion, and the unmutated view passes all of them.
Co-authored-by: CommandCodeBot <noreply@commandcode.ai>
