🎨 Palette: [a11y] Improve form error and helper text accessibility

[schmug]

💡 What:

• Added aria-describedby="wizard-domain-error" to the domain input in the "Add Domain" wizard.
• Added id="wizard-domain-error", role="alert", and aria-live="polite" to its corresponding dynamic error message container.
• Added id="webhook-format-help" to the helper paragraph under the "Webhook Format" select on the Settings page.
• Added aria-describedby="webhook-format-help" to the "Webhook Format" select element.

🎯 Why:
To improve accessibility for screen reader users. Previously, dynamic error messages in the "Add Domain" wizard were not announced to screen readers, and the helper text for the webhook format select was not programmatically associated with the input.

♿ Accessibility:

• Screen readers will now announce the dynamic error message immediately when it appears in the "Add Domain" wizard.
• When focus is placed on the domain input, screen readers will announce any existing error message.
• When focus is placed on the webhook format select, screen readers will announce the helper text explaining the format options.

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PR created automatically by Jules for task 8129452858957199216 started by @schmug

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	dmarcheck	82cfb5a	May 04 2026, 01:28 AM