Race with Timeout

Implement raceWithTimeout(promise, ms, fallback) that races a promise against a timeout.

Requirements

• If promise resolves within ms milliseconds, return its value.
• If the timeout fires first, return fallback.
• The function should never reject — catch any errors from the promise and return fallback.

Example

await raceWithTimeout(
  new Promise(r => setTimeout(() => r('done'), 50)),
  100,
  'timeout'
); // 'done'

await raceWithTimeout(
  new Promise(r => setTimeout(() => r('done'), 200)),
  100,
  'timeout'
); // 'timeout'