feat: Implement pack purchase and access flow

Commit notes

This commit adds the functionality for users to purchase creator packs. It includes: - Displaying pack details and price. - Handling checkout initiation via Mollie. - Verifying purchase completion after redirect. - Granting access to packs upon successful purchase. - Supporting guest purchases with email verification. - Integrating toast notifications for user feedback. - Updating the `pnpm-lock.yaml` file with new dependencies.

Co-authored-by: armin.naimi <[email redacted]>