- Redesigned all email templates with professional corporate style
- Created base layout with dark header, status cards, and footer
- Updated: subscription-cancelled, account-activation, welcome, welcome-new-user, due-payments-alert
- Removed emojis and gradients for cleaner look
- Added multi-language support (ES, PT-BR, EN)
- Fixed email delivery (sync instead of queue)
- Fixed PayPal already-cancelled subscription handling
- Cleaned orphan subscriptions from deleted users
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