Lead magnet + email capture funnel

Build a landing page + email capture flow for a lead magnet (ebook, template).

Core features:
1. Long-form landing page with hero, benefits, testimonials
2. Email capture form with double opt-in
3. Automatic email delivery of the PDF via Resend
4. Simple admin: view subscribers, export CSV, unsubscribe list

Data: subscribers, sends, unsubscribes.
Must-haves: honeypot + rate limit on submit, GDPR consent checkbox.