fix: wrap scrollToIndex in requestAnimationFrame

Author: mxschll

src/select/parts/virtual-list.tsx

@@ -74,7 +74,10 @@ const VirtualListOpen = forwardRef(
               menuEl: menuRefObject?.current,
             });
           } else {
-            scrollToIndex(index);
+            // Fix for AWSUI-61506. Defer scroll to next frame to ensure
+            // virtual items are measured after re-render.  When called from
+            // parent's useEffect, measurements may not be ready yet.
+            requestAnimationFrame(() => scrollToIndex(index));
           }
         }
         previousHighlightedIndex.current = index;