- Extract handleOAuthCallback to eliminate GET/POST duplication in oauth.ts
- Add P2002 race condition handling in findOrCreateUser
- Add .unref() to stateStore cleanup timer to not block process exit
- Use Provider union type instead of bare strings throughout OAuth code
- Export API_BASE from api.ts, reuse in OAuthButtons
- Extract MobileBranding component to deduplicate Login/Register mobile brand
- Extract shared Logo component in AuthBranding
- Remove unnecessary WHAT comments
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
YANG JIANKUAN
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