You'll notice
Login error screen turns trailing URLs in OAuth errors into clickable links and can show messages verbatim
What
The screen shown when logging in via OAuth fails now looks for a URL at the end of the error message and, if found, displays it as a clickable link rather than as plain text. The screen also gained a verbatim mode, which shows the raw error message as-is without prefixing it with "OAuth error:".
Why
This makes it easier to act on login errors that include a link, such as one pointing to a page to resolve the issue, and lets some error messages be shown exactly as received when a prefix wouldn't make sense.