v1.57.0

Changed

• A request that hits an unexpected error now returns a proper error response instead of hanging. This completes the background-crash hardening started in the previous release: a failing request used to leave the browser waiting until it timed out, with nothing in return. It now gets a clear "Internal server error" response right away, and the manager stays running. Part of moving to the current version of the web framework the app is built on; all existing pages and API calls behave exactly as before.