message: Fix missing arrow in PR header in `clean-conversation-headers`
diff: @@ -46,7 +46,7 @@ async function cleanPrHeader(): Promise<void | false> {
  if (baseBranchDropdown) {
  baseBranchDropdown.after(<span>{arrowIcon}</span>); // #5598
  } else {
  - base.nextElementSibling!.replaceChildren();
  + base.nextElementSibling!.replaceChildren(arrowIcon);
  }
  const baseBranch = base.title.split(':')[1];
  