This was found in #535 (comment) when investigating the app's behavior with a screen reader:

The "----OR-----" separator on the login page might need a caption that elaborates on what it means. Without a visual cue, it is a bit abrupt as a single word. (Note, by navigating the third-party sign-in sites, we can compare those pages' accessibility with ours quite conveniently.) Trying it on GitHub, there is an invisible element right after the "sign in" button! It reads "password log-in alternatives", and the option after it is "sign in with a passkey".

We should fix this. The described solution from GitHub sounds good.

A required part of any PR to address this issue will be to try it out with a screen reader and confirm how it behaves. See the description of #535 for instructions.