- Added required validation for bvs_number field in send_plan.php
- Updated form label to show asterisk (*) indicating required field
- Implemented file attachment support in email notifications (multipart MIME)
- Files are now temporarily saved and automatically deleted after email is sent
- Update form fields: Change 'Имя' to 'Фамилия, имя', add required phone field
- Add PDF upload for drone registration notice (BVS notice)
- Update trip conditions: Change 'Поездки с полетами дронов' to 'Дронослёты'
- Update submission deadline from 7 days to 5 days for drone flights
- Add detailed time departure info with location dependency
- Update privacy consent text and add centered consent header
- Hide November 2025 flights (set active: false)
- Update December 2025 flights image to winter drone photo
- Add backend validation for phone field and PDF file upload (max 5MB, PDF only)
- Update email notification function for consistent handling
- Add AJAX handler to ask.md (same as plan.md)
- Improve load_env_file() to strip inline comments and spaces
- Create ERRORS_COLLECTION.md documenting all 7 error categories
- Fixes white page/JSON display issue in ask form
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