- Swipe left bookmarks a story (toggle) into the Saved tab; swipe right opens
the iOS share sheet and marks the story read.
- New SavedStory SwiftData model; Saved tab now lists explicit bookmarks
instead of the whole offline cache.
- Convert the feed to a styled List (native swipeActions require it), keeping
the flat look, pull-to-refresh, and infinite scroll. Add a ShareSheet wrapper.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
