fix: rewrite discovery survey email to avoid Gmail Promotions tab

feat: add user selector with Supabase integration for email compose

feat: add brand logo image to email templates with consistent base structure

feat: add email compose page with template picker and Resend integration

feat: add protected email dashboard with Resend API integration

feat: replace pricing question with Sean Ellis perceived value test

feat: replace Discord links with email contact and add survey email tooling

fix: make all survey fields optional and add spacing below header

fix: map camelCase field names to snake_case for backend API

feat: add user discovery survey page with bilingual support

landing: clarify Pro auto-activates on signup during beta

Revert "clarify: Pro activates automatically during beta - no manual steps"

clarify: Pro activates automatically during beta - no manual steps

fix(branding): OG image with correct isotipo (double hexagons) + text

fix(branding): use correct logo for OG image