- Add radio, national_id, location, section_divider, terms field types to FormFieldType enum
- Add field uniqueness constraint (blocks duplicate registrations per unique field)
- Add Google Maps locations support (JSONB column + map embed on public page)
- Add conditional field visibility (show field only when another field equals a value)
- Add min/max length, min/max value, regex pattern validation per field
- Add allow_other option for select/radio/multi_select fields
- Add field description/help text, placeholder, default value
- Add duplicate field action in form builder
- Add section dividers for visual grouping
- Add terms acceptance field type with URL link
- Sanitize form fields before save (auto-fill values, strip invalid options)
- Public registration form uses Alpine.js for conditional visibility
- Character counters shown when max_length is set
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>