message: Restore `clean-header-search-field`
diff: import elementReady from 'element-ready';
  import * as pageDetect from 'github-url-detection';
  +import select from 'select-dom';
  import features from '../feature-manager';
  async function init(): Promise<void> {
  - (await elementReady('input.header-search-input'))!.value = '';
  + const headerSearchButton = await elementReady('button.header-search-button');
  + headerSearchButton!.classList.add('placeholder');
  + select('[data-target="search-input.inputButtonText"]', headerSearchButton)!.textContent = headerSearchButton!.getAttribute('placeholder');
  }
  void features.add(import.meta.url, {
  