Accessibility Improvements - Additional a11y changes

[StoneMoney]

Form Error Live Alerting

• Replaces the form error alert behavior from Accessibility Improvements: Form Field Error Alerting #396 with a global error list announce element.
• All form errors will be gathered in a 100ms "push wave" before sending to the global error element
• Alerts will be ordered based on where they are in the DOM tree
• Alert list will take the error message and prefix the label of the errored input unless the error message contains the label name already, strips : and *
• Now relocates the EN error messages to be positioned below the input field in the DOM (no visual difference) for better symantics
• Focuses the first errored input in the form on form bad validation.

Misc Other Fixes

• Drop empty "for" attributes on radio groups (invalid IDREF)
• removed dead ternary L48
• modernized .engrid__sr-only with clip-path: inset(50%), margin: -1px, padding: 0, border: 0.
• clearFieldError now only removes aria-invalid if no .en__field__error nodes remain in the field wrapper.