- Don't blank the feed on refresh: keep current stories until new data
arrives, and ignore benign URLError.cancelled (-999) so a network blip
no longer wipes the list. Coalesce WebSocket story.created bursts into a
single debounced refresh.
- Empty state now distinguishes polling, couldn't-reach-server (with the
error + host + Retry), offline, and genuinely-empty.
- Track read stories in SwiftData (ReadStory); mark a story read when opened
and drop/dim its signal stripe across the feed and Latest/Saved/Search.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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