- Users can share/unshare their flashcard decks (toggle button)
- Shared tab: paginated list of all shared decks sorted by avg rating
- Star rating system (1-5): click stars to rate, updates average live
- Each user can rate each shared deck once (upsert on re-rate)
- Admin can force-unshare any deck (remove from shared listing)
- Shared decks are study-able by anyone (read-only access)
- Owner name displayed on shared deck cards
- Load more button for shared decks (12 per page)
- New DB table: flashcard_deck_ratings (user_id+deck_id unique)
- New column: flashcard_decks.is_shared (default 0)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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