feat(web): implement SearchCluster splitting 🚂#15031

jahorton wants to merge 2 commits intochange/web/prepare-for-divergent-splitskeymanapp/keyman:change/web/prepare-for-divergent-splitsfrom

feat/web/cluster-splitting-and-mergingkeymanapp/keyman:feat/web/cluster-splitting-and-mergingCopy head branch name to clipboard