🎨 Palette: Add accessible validation to Add Domain wizard

[schmug]

💡 What

Added robust ARIA attributes (aria-describedby, role="alert", aria-live="polite") to the client-side validation error container in the "Add Domain" modal wizard.

🎯 Why

When users attempt to add an invalid domain, JavaScript dynamically injects an error message. Previously, this visual text change was completely silent to screen readers, leaving visually impaired users confused as to why the "Next" button was not functioning.

♿ Accessibility

• Linked the wizard-domain input to its error container using aria-describedby="wizard-domain-error".
• Added role="alert" and aria-live="polite" to the error container.
• Now, when the error appears, screen readers will proactively announce "Enter a valid domain like example.com." without the user needing to manually move focus to discover the error.

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PR created automatically by Jules for task 17742741531299988961 started by @schmug

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	dmarcheck	ab8c1b7	May 03 2026, 01:21 AM