- Add useCollapsibleItems: key-based open state, clickable/keyboard head, aria-expanded - sortable items with sub-fields and every inline repeater/group row now collapse - Repeater head summary falls back to the first filled field when no listPreview - Drop per-schema collapsible/defaultCollapsed for repeater groups (JS + PHP) - Align FloatBtnItemPanel head with the shared collapse attrs Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>