- Added sanitization for additional_work array in sanitize_submission()
- Keys sanitized with sanitize_key(), values with sanitize_text_field()
- Added sanitization for sonstiges with sanitize_textarea_field()
- Added generate_additional_work_sections() to generate email tables
- Added has_additional_work_data() helper to check if section has data
- Added generate_sonstiges_section() for Sonstiges textarea in email
- Email tables use legacy bgcolor='#CCCCCC' header pattern
- All 4 field types (checkbox, abbau_aufbau, checkbox_anzahl, text) handled
- Empty sections omitted from email for clean formatting
- Line breaks preserved in Sonstiges with nl2br()
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Viktor Miller
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