feat: implement comprehensive email confirmation flow

[tr4m0ryp]

🎯 Email Confirmation Flow Improvements

This PR implements a comprehensive email confirmation system that addresses the user registration issues and provides a much better user experience.

🔧 Key Improvements

1. Custom Email Templates

• ✅ Professional FrogBytes-branded email templates
• ✅ Clear instructions and call-to-action buttons
• ✅ Responsive design for all email clients
• ✅ Security notes and expiration warnings

2. Enhanced User Experience

• ✅ Dedicated email verification page ()
• ✅ Email confirmation handler ()
• ✅ Clear status messages and progress indicators
• ✅ Resend confirmation email functionality
• ✅ Automatic redirect after successful confirmation

3. Technical Improvements

• ✅ Updated Supabase configuration for production URLs
• ✅ Enhanced database triggers for user profile creation
• ✅ New API endpoint for resending confirmation emails
• ✅ Better error handling and user feedback
• ✅ TypeScript compliance and code quality

4. Database Enhancements

• ✅ Improved trigger
• ✅ Manual email confirmation functions for testing
• ✅ Better indexing for performance
• ✅ Comprehensive documentation

🚀 New Features

1. Professional Email Templates

   • Custom HTML templates with FrogBytes branding
   • Clear instructions and security notes
   • Responsive design for all devices

2. Enhanced Verification Flow

   • Clear instructions for users
   • Resend confirmation functionality
   • Status tracking and feedback
   • Automatic redirect after confirmation

3. Better Error Handling

   • User-friendly error messages
   • Clear instructions for troubleshooting
   • Support for expired links

🧪 Testing

• ✅ TypeScript compilation successful
• ✅ ESLint warnings resolved
• ✅ Prettier formatting applied
• ✅ All pre-commit checks pass
• ✅ Development server running successfully

📋 Files Changed

• • Email verification instructions page
• • Email confirmation handler
• • Resend confirmation API
• • Custom confirmation email template
• • Custom password reset email template
• • Database improvements
• • Updated configuration for production URLs

🎯 User Experience

Before: Users were confused about email confirmation and couldn't resend emails.

After:

• Clear instructions and professional emails
• Easy resend functionality
• Automatic redirect after confirmation
• Better error handling and feedback

This implementation provides a production-ready email confirmation system that will significantly improve the user registration experience!

---

Summary by cubic

Adds a complete email confirmation flow with branded emails, verify/confirm pages, and resend support. Improves sign-up UX and ensures reliable profile creation via updated DB triggers.

• New Features

  • /auth/verify guides users and resends via /api/auth/resend-confirmation.
  • /auth/confirm validates tokens, shows status, and redirects to /login.
  • Custom Supabase templates for confirmation and password reset.
  • Register now redirects to /auth/verify; login shows “email confirmed” banner.
  • Supabase config updated with localhost redirect URLs and template bindings.

• Migration

  • Run 20250127000003_email_confirmation_improvements.sql (replaces handle_new_user, adds helper funcs, indexes).
  • Ensure public.users and public.user_profiles exist for the trigger.
  • Apply supabase/config.toml changes and reload Supabase Auth to load templates.
  • Verify by registering, confirming via email, and testing the resend flow.

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Project	Deployment	Preview	Comments	Updated (UTC)
frogbytes-summary-v3	Ready	Preview	Comment	Oct 23, 2025 5:35pm

[cubic-dev-ai]

2 issues found across 9 files

Prompt for AI agents (all 2 issues)

Understand the root cause of the following 2 issues and fix them.


<file name="app/register/page.tsx">

<violation number="1" location="app/register/page.tsx:114">
Avoid placing the user’s email in the URL; it leaks PII through history, logs, and referrers. Prefer passing this data via protected storage (e.g., session storage or server state) and keep the URL free of PII.</violation>
</file>

<file name="supabase/migrations/20250127000003_email_confirmation_improvements.sql">

<violation number="1" location="supabase/migrations/20250127000003_email_confirmation_improvements.sql:61">
The SECURITY DEFINER function confirm_user_email lets any caller update auth.users by email alone, so an attacker can confirm arbitrary accounts without a token. Please remove or lock down this function so only a trusted backend or verification token can run the update.</violation>
</file>

_{React with 👍 or 👎 to teach cubic. Mention @cubic-dev-ai to give feedback, ask questions, or re-run the review.}

[cubic-dev-ai]

Avoid placing the user’s email in the URL; it leaks PII through history, logs, and referrers. Prefer passing this data via protected storage (e.g., session storage or server state) and keep the URL free of PII.

Prompt for AI agents

Address the following comment on app/register/page.tsx at line 114:

<comment>Avoid placing the user’s email in the URL; it leaks PII through history, logs, and referrers. Prefer passing this data via protected storage (e.g., session storage or server state) and keep the URL free of PII.</comment>

<file context>
@@ -111,7 +111,7 @@ export default function RegisterPage() {
       // Check if email confirmation is required
       if (data.message &amp;&amp; data.message.includes(&#39;check your email&#39;)) {
-        router.push(&#39;/login?registered=true&amp;confirm=true&#39;)
+        router.push(&#39;/auth/verify?email=&#39; + encodeURIComponent(email))
       } else {
         router.push(&#39;/login?registered=true&#39;)
</file context>

[cubic-dev-ai]

The SECURITY DEFINER function confirm_user_email lets any caller update auth.users by email alone, so an attacker can confirm arbitrary accounts without a token. Please remove or lock down this function so only a trusted backend or verification token can run the update.

Prompt for AI agents

Address the following comment on supabase/migrations/20250127000003_email_confirmation_improvements.sql at line 61:

<comment>The SECURITY DEFINER function confirm_user_email lets any caller update auth.users by email alone, so an attacker can confirm arbitrary accounts without a token. Please remove or lock down this function so only a trusted backend or verification token can run the update.</comment>

<file context>
@@ -0,0 +1,104 @@
+  
+  -- Update the user to confirm their email
+  UPDATE auth.users 
+  SET email_confirmed_at = NOW(),
+      updated_at = NOW()
+  WHERE id = user_id;
</file context>