useStreamPosts now exposes loadMore(), hasMore, and isLoadingMore for
cursor-based pagination. loadMore fetches the next page using
until=oldest-1, same pattern as useFeed for follows/global tabs.
Wired up in all three spell consumers:
- SavedFeedContent (home feed tabs)
- ProfileSavedFeedContent (profile custom tabs)
- SpellRunPage (shared spell viewer)
Previously these only showed the initial batch of ~40 events with no
way to scroll back in time.
Lemon
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