Offline caching:
- BackgroundRefreshManager.preCacheArticles() fetches top article per story
(score ≥60, up to 20 stories) and stores as CachedArticle in SwiftData
- Runs after every BG fetch AND after every foreground sync via StoryStore
- Articles are available in ArticleReaderView offline without ever opening them
Pull-to-refresh reshuffle when nothing new:
- loadStories(refresh:) now returns newCount (genuinely new story IDs)
- If server returns 0 new stories, feed merges in any BG-cached stories not
already in the live feed, then re-sorts by signal score (reshuffle)
- seenSnapshot is always cleared so everything re-ranks fresh
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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