Function checkPublicConnectivity

src/utils/network-check.ts:140–152

(timeoutMs = DEFAULT_TIMEOUT_MS)

 * Result is returned as a structured diagnostic; never throws.
 */
export async function checkPublicConnectivity(timeoutMs = DEFAULT_TIMEOUT_MS): Promise<NetworkDiagnostic> {
  const probes = await Promise.all(
    PUBLIC_ENDPOINTS.map(e => probeEndpoint(e.url, e.label, timeoutMs)),
  );
  // "Internet" = can we reach Cloudflare 1.1.1.1? Other probes can be blocked
  // by ISP without that meaning the machine is offline.
  const cf = probes.find(p => p.endpoint === 'https://1.1.1.1');
  let internet: 'ok' | 'blocked' | 'unknown' = 'unknown';
  if (cf?.status === 'ok') internet = 'ok';
  else if (cf?.status === 'dns_failed' || cf?.status === 'connection_refused') internet = 'blocked';
  else if (probes.some(p => p.status === 'ok')) internet = 'ok'; // CF blocked but something works
  return { internet, probes, timestamp: Date.now() };
}

/**
 * Quick probe of local model backends. Used by startup banner so we can tell