Replace the per-field `section` text property with a dedicated HEADING field type that
organizers add as a separate block for visual grouping. Also fixes duplicate heading bug
on portal radio fields, replaces cramped VBtnToggle with VSelect for field width, and
adds grouped field type dropdown with structure/input categories.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Add configurable column widths (full/half) and optional descriptions
for radio/select/checkbox options on registration form fields.
- Migration adds display_width column to both tables
- FieldDisplayWidth enum with smart defaults per field type
- normalized_options accessor for backwards-compatible option format
- Portal form renderer uses display_width for VRow/VCol grid layout
- Radio/select/checkbox options render with descriptions
- Admin field editor supports display_width toggle and description input
- System templates updated with appropriate widths and descriptions
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
