The alert detail screen now creates with a lifetime (1/3/7/14 days) and shows expiresAt, lists subscriber rows by their non-identifying fields, and renders each ending (delivered, expired, disarmed, deleted) as a terminal state instead of a stale alert. Settings configures the single instance origin and reports the real readiness/listening checklist; the trigger pad keeps its 1200ms hold, and time helpers format the deadline and last-seen values.
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