Replaces the read-only token and the webhook automation, which every install
would have had to paste into its own Home Assistant. Connect now goes to Home
Assistant's own sign-in page, and Steward keeps the refresh token that comes
back, encrypted, and calls backup.create_automatic and update.install directly.
The connection page warns that the stored credential has the same access as
the user who signed in, and recommends a service account so Steward's actions
are easy to tell apart in Home Assistant's logs. A user who isn't an
administrator gets the status page and no Install.
Those actions answer only when finished, so a request cut off once sent counts
as sent and the outcome is read from the entities. Removing the connection, or
signing in again, ends the old sign-in on Home Assistant.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
