On a new box the home-network login now also finds the account number
(accountInfo) and registers the box as a device, so no email, password
or account number is needed. The new device id is saved straight away,
so a retry reuses it instead of adding another one. Error pages from the
new servers (including HTML 401s) are retried.
Tested live on 2026-11-07 with a fresh profile; the test devices were
deleted afterwards.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>