chore: establish learning module baseline

OpenMAIC/lib/prosemirror/selection-sync.ts

@@ -0,0 +1,6 @@
+import type { Transaction } from 'prosemirror-state';
+
+/** Push toolbar attrs when the selection moved or marks/doc changed. */
+export function shouldPushAttrs(tr: Transaction): boolean {
+  return tr.selectionSet || tr.docChanged || tr.storedMarksSet;
+}