Add purposeful app motion foundation #111MergedMaggieAppletonmerged 15 commits intomainfromrefs/pull/111/headConversationFiles changed6 files changed+251-0StackedSplitapps/web/src/main.tsx+2 −0apps/web/src/motion-input.ts+18 −0apps/web/src/theme.css+33 −0packages/editor/src/index.ts+2 −0packages/editor/src/transition-presence.test.ts+69 −0packages/editor/src/transition-presence.ts+127 −0