fix(auth): unify OAuth button styles and disable email login

[graycyrus]

Summary

• Unified all three OAuth CTAs (Google, GitHub, Twitter) to a consistent white pill-button style with light gray border — replacing individual brand-colored backgrounds
• Updated GitHub and Twitter icon fills to dark colors for visibility on white background
• Commented out non-functional email login section (input + button) until backend auth flow is implemented
• Removed unused useState import and email state/handler

Test plan

• Verify all 3 OAuth buttons render as white pills with consistent styling
• Verify OAuth login flows still work for Google, GitHub, and Twitter
• Verify email section is not visible on the Welcome page
• Run yarn typecheck — passes
• Run yarn lint — no new warnings

Summary by CodeRabbit

• Style
  • GitHub and Twitter OAuth sign-in buttons updated to light theme styling
  • Email login option removed; users can now authenticate using OAuth providers only

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4e59b0bb-f877-4f6f-96b6-60c0c7699cec

📥 Commits

Reviewing files that changed from the base of the PR and between 4f0513b and 83f7720.

📒 Files selected for processing (2)

• app/src/components/oauth/providerConfigs.tsx
• app/src/pages/Welcome.tsx

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📝 Walkthrough

Walkthrough

The PR applies a light theme styling conversion to OAuth provider buttons (GitHub and Twitter) and removes email-based login functionality from the Welcome component, leaving OAuth sign-in as the only authentication method.

Changes

Cohort / File(s)	Summary
OAuth Provider Styling app/src/components/oauth/providerConfigs.tsx	Updated TwitterIcon and GitHubIcon SVG fill colors to darker tones. Converted GitHub and Twitter button styling from dark theme (bg-gray-900, text-white) to light theme (bg-white, text-gray-900) with corresponding hover state adjustments.
Welcome Component Refactoring app/src/pages/Welcome.tsx	Removed email state management (useState) and form submission logic (handleEmailSubmit). Commented out entire email login UI (divider, form, input fields). Removed !text-xs class from OAuth button. OAuth sign-in is now the only active authentication method.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• feat(welcome): redesign sign-in page to match Figma card layout #417: Modifies the Welcome sign-in flow and OAuth button configurations, with direct overlap on authentication UI changes and provider button styling.

Poem

🐰 From dark to light, the buttons take flight,
Twitter and GitHub in white now stand bright,
Email login bids its farewell with cheer,
OAuth reigns supreme—simplification is here! ✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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