Bluesky app fork with some witchin' additions 馃挮 forked from jollywhoppers.com/witchsky.app

Make scroll handling contextual (#2200) master

* Add an intermediate List component * Fix type * Add onScrolledDownChange * Port pager to use onScrolledDownChange * Fix on mobile * Don't pass down onScroll (replacement TBD) * Remove resetMainScroll * Replace onMainScroll with MainScrollProvider * Hook ScrollProvider to pager * Fix the remaining special case * Optimize a bit * Enforce that onScroll cannot be passed * Keep value updated even if no handler * Also memo it