fix(ui): prevent inline toolbar from hiding when interacting with submenus

- keep toolbar visible when focus moves to an element inside `[data-inline-toolbar]`
- unpin toolbar on cleanup when submenu closes to avoid stale pinned state

src/shared/components/BlockEditor/inline/Toolbar.client.js

@@ -47,6 +47,7 @@ export default function InlineToolbar({ rect, activeMarks, onToggleMark, onSetMa
 
   useEffect(() => {
     onPinChange?.(openSubmenu !== null);
+    return () => { onPinChange?.(false); };
   }, [openSubmenu, onPinChange]);
 
   useLayoutEffect(() => {