End-to-end testing across all flows

**Sprint 7 - Admin Tools & Handoff**

Perform end-to-end testing across all flows:
- Admin authentication and dashboard flows
- User sign-up/login flow
- Subscription purchase and gating
- Event registration (preset time and user scheduling)
- Coaching scheduling flow
- Webinar access and content gating
- Payment processing
- Email notifications
- Get final feedback from NP