Add Google sign up flow to registrations

[jjmata]

Summary

• add a Google sign-up button to the registration page that mirrors the login styling
• create users and families from OpenID Connect data with default onboarding preferences and skip the setup step when complete
• localize the new copy and cover the flow with a controller test

Testing

• bin/rails test test/controllers/sessions_controller_test.rb

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https://chatgpt.com/codex/tasks/task_e_68de3ffa2b348332acb596503c04780f

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/add-google-sign-up-button-to-registration

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