Equal-score stories reshuffled on every pull-to-refresh because the sort was unstable. Add StorySummary.feedOrder (signalScore desc, then id desc, mirroring the backend's signal_score DESC, id DESC) and use it for the feed, the WebSocket re-sort, and the Saved/Search tabs. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>