fix: expose accordion contents and add clear insert actions (1.8.3)

public/assets/editor-model.js

@@ -148,6 +148,8 @@ export function insertionTarget(document, selected, type) {
   }
   const probe = { type };
   let item = locate(document.blocks, selected);
+  // Content belongs to a chosen entry. Do not silently place it outside the accordion.
+  if (item?.block.type === 'accordion' && type !== 'accordionitem') return null;
   if (item && canContain(item.block, probe)) return { parentId: item.block.id, index: (item.block.children ?? []).length };
   while (item) {
     const parentId = item.parent?.id ?? null;