feat: add Sign In with Google

Adds Google OAuth alongside existing Apple and email/password auth. Follows the same patterns as Apple Sign-In: state cookie for CSRF, anonymousId migration, and user linking by email. Key differences: Google callback is a GET redirect (sameSite: lax) and uses a static client secret instead of a signed JWT.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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George PowellandClaude Sonnet 4.6 committed 2026-03-25 01:39:24 -04:00
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