/**
 * Remove the dev-only `?scenario=` and `?role=` params from a URL. Once the
 * dev switcher (debug-state) has been used, sessionStorage is the authoritative source
 * for both — `currentScenario()`/`currentRole()` read the URL FIRST, so a stale param
 * left in the address bar would override the switcher on reload (the "stuck on slow"
 * bug). Stripping the params before reload lets the stored value win. Pure: returns the
 * rewritten href, mutates nothing.
 */
export function stripDevParams(href: string): string {
  const url = new URL(href);
  url.searchParams.delete('scenario');
  url.searchParams.delete('role');
  return url.toString();
}