export function buildWsUrl(token: string): string {
  const explicit = import.meta.env.VITE_WS_URL;
  if (explicit) {
    return `${explicit}?token=${encodeURIComponent(token)}`;
  }
  const protocol = window.location.protocol === "https:" ? "wss:" : "ws:";
  return `${protocol}//${window.location.host}/api/v1/realtime/ws?token=${encodeURIComponent(token)}`;
}