feat: replace email login with google and github sign-in

[devhims]

Replace the email sign-in form on /login with Google and GitHub buttons for both new and returning users. Add GitHub to Better Auth using platform-only credentials, preserve dashboard return destinations, and handle connection failures, rate limits, and pending requests.

The CLI device authorization page and existing magic-link endpoint remain unchanged. Local setup documentation includes provider credentials and callback URLs. No database migration is needed.

Validation:

• Platform auth unit tests: 30 passed; platform TypeScript build passed.
• Web unit tests: 32 passed; production webpack build passed.
• Worker auth integration tests: 5 passed, including Google and GitHub authorization URLs, callback URLs, state, and identity scopes.
• Browser login/logout tests: 8 passed in Chrome with isolated local fixture servers, including desktop/mobile layout, redirects, retries, and loading states.
• Live development GitHub OAuth completed successfully, with the authenticated dashboard session surviving refresh.

Production GitHub credentials have been configured in Cloudflare by the maintainer. Deploy both platform and web changes after merge; production sign-in verification remains for the maintainer.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
video2ctx-web	Ready	Preview	Sep 17, 2026 1:57pm UTC