Add Field Groups to DataForm

[jameskoster]

Proposal

Add a FieldGroup abstraction within DataForm that represents a meaningful grouping of related fields e.g. Address, or Credit card inputs.

This would map to semantic fieldset and legend elements in the markup, giving clearer structure and built-in accessibility.

FieldGroups can be visually separated from other fields using dividers or some other style technique.

---

Why

• Aligns useful visual separation of fields with meaningful structure.
• Adopts semantic HTML (fieldset / legend)
• Scales better as forms grow in complexity

---

Open Questions

• Should FieldGroup require a legend?
• Do we allow visually hidden legends?
• Do we need support for nested groups?
• Would FieldGroup require any special rules for specific layout options (e.g. in row layout it may make sense for FieldGroup to always occupy a full row.