Per-issue WS events (comments, activities, reactions, subscribers) were
only handled by component-level useWSEvent hooks that unsubscribe on
unmount. With staleTime: Infinity, this left timeline/reactions/subscribers
caches silently stale — reopening an issue served cached data without
refetching, causing missing comments in inbox and issue detail views.
Add global fallback handlers in useRealtimeSync that invalidateQueries
for the affected issue on every per-issue WS event, ensuring caches are
marked stale even when IssueDetail is unmounted.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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