🎨 Palette: [UX improvement] Semantic HTML for form control grouping

[n24q02m]

💡 What:
Replaced generic <div class="setting-row"> containers that act as groups with native semantic <fieldset> tags. Converted their explicit heading <label> elements to <legend> tags, and removed redundant ARIA attributes (role="radiogroup", role="group", aria-labelledby) from the inner containers. Added CSS reset for <fieldset> to preserve layout and mapped <label> styling to <legend>.

🎯 Why:
Using native semantic elements (<fieldset> and <legend>) is a superior accessibility practice compared to relying on generic <div> tags paired with role and aria-labelledby attributes. It provides immediate, out-of-the-box structural meaning to screen readers and reduces markup complexity and maintenance surface area.

📸 Before/After:
(Visually identical, structural change only. See verification screenshot in PR).

♿ Accessibility:

• Replaced synthetic role="radiogroup" and role="group" with native <fieldset>.
• Replaced synthetic grouping labels (aria-labelledby) with native <legend> elements.
• Cleaned up redundant ARIA attributes.
• Ensured keyboard navigation and focus states remain unaffected by layout preservation.

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PR created automatically by Jules for task 4897535285164563902 started by @n24q02m

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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

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