🎨 Palette: Improve accessibility of Add Domain wizard validation

[schmug]

💡 What: Added id, role="alert", and aria-live="polite" attributes to the domain validation error container in the Add Domain wizard, and linked the domain input to it using aria-describedby.
🎯 Why: To ensure screen readers immediately announce form validation errors (like "Enter a valid domain like example.com") without the user losing focus, making the multi-step form fully accessible.
📸 Before/After: The visual UI remains exactly the same, but the underlying markup is now semantically correct for assistive tech. (See attached verification screenshot/video).
♿ Accessibility: Fixes a critical a11y gap where dynamically generated error text was previously invisible to screen readers since focus remains on the input field when validation fails.

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PR created automatically by Jules for task 3207319276568376123 started by @schmug

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	dmarcheck	8f74b14	May 08 2026, 01:30 AM