- Create supabase/shared/email-template-renderer.ts for code reuse
- Update send-auth-otp to import from shared file (eliminates 260 lines of duplication)
- Add isResendOTP state to track existing user email confirmation
- Update login error handler to detect unconfirmed email
- Show helpful message when user tries to login with unconfirmed email
This addresses:
1. Code duplication between src/lib and edge functions
2. User experience for unconfirmed email login attempts
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