Signing in with Google or Microsoft needs a free Client ID, made once in your own account (about 10 minutes each). The full steps are in SETUP-EMAIL.md.
Saved in this browser so you can sign in straight away. To switch sign-in on for every device and everyone using the site, send the IDs to Claude (they're not passwords), or paste them into index.html as SETUP-EMAIL.md explains.
index.html