Email confirmation screen #185

🧾 Title

Email confirmation screen

🧠 Summary

After email sign-up, Supabase sends a confirmation email but there is no 'Check your inbox' screen or handling for the confirmation link callback.

📦 Scope

An intermediate screen shown immediately after email signup, and a handler for the auth confirmation URL fragment that Supabase appends to the redirect.

🚫 Out of Scope

Resend confirmation email (nice-to-have, separate issue).

✅ Acceptance Criteria

• 'Check your inbox' screen shown after email signup
• Supabase confirmation link lands the user on the app (not a blank page)
• Confirmed user is signed in and redirected to the hub

🧪 Testing / Validation

• Sign up with an email, verify the screen shows
• Follow the confirmation link, verify session is established