async function loadChunk(ts) {
  const base = sessionStorage.rust ? 'big-chunk' : 'chunk'
  return await fetchWithAuth(ts ? `${base}-1.json?ts=${ts}` : `${base}-0.json`, true)
}
Loads a single chunk of events.

In production systems, chunk loading would include:
- Retry logic for network failures
- Proper error handling and reporting
- Respect for HTTP caching headers
- Possibly streaming responses for large chunks

@param {number} ts - Timestamp to fetch events after
@returns {Promise<Array>} Array of events in the chunk