feat: WCAG (1.3.1) add FieldLegend component to address missing legend

[sandranymark]

Proposed changes (including videos or screenshots)

Adds a new FieldLegend component that renders a visually hidden <legend> to be used inside FieldGroup components. This addresses the “missing legend” warning reported by WAVE and improves semantic structure in accordance with WCAG 1.3.1 – Info and Relationships.

• Uses @react-aria/visually-hidden to visually hide the legend while keeping it accessible to assistive technologies.

• Ensures semantic correctness by preserving the required as a direct child of the

  rendered by FieldGroup.

• Intended for use in FieldGroup components.

Issue(s)

Screenshots

Further comments

I've tried to hide the <legend> element both visually and from screen readers to avoid redundancy and improve accessibility.

I'm using @react-aria/visually-hidden to hide the legend in a way that removes it from the visual flow and from screen reader output.

This is important because the same text (t('DummyText')) is already passed to <AccordionItem title={t('DummyText')}>, which provides both the visible label and the screen reader announcement. Including it again in a <legend> would result in redundant information for assistive technologies.

The goal here is to preserve the semantic structure (keeping the <legend> as part of the DOM) while avoiding duplicate announcements.

From a WCAG perspective, this approach should be acceptable, since FieldLegend is still a direct child of FieldGroup (which renders a <fieldset>), and a <fieldset> requires a <legend> for semantic correctness.

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