Update custom .required CSS in AlertReportModal to use theme.colorIcon
for consistency with the shared ModalFormField component.
AlertReportModal was using its own .required CSS that overrode the
dynamic validation-based styling, causing inconsistent asterisk colors
across different modals.
Now all required field asterisks use the same subtle theme.colorIcon
color for a consistent, professional appearance.
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Co-Authored-By: Claude <noreply@anthropic.com>