findMatchingRule function

function findMatchingRule(
  rules: FieldRule[],
  field: FormField,
): FieldRule | undefined {
  // Sort by priority (descending) so higher priority rules take precedence
  const sorted = [...rules].sort((a, b) => b.priority - a.priority);

  return sorted.find((rule) => {
    // Match by CSS selector
    if (rule.fieldSelector && field.element.matches(rule.fieldSelector)) {
      return true;
    }
    // Match by field name
    if (
      rule.fieldName &&
      (field.name === rule.fieldName || field.id === rule.fieldName)
    ) {
      return true;
    }
    return false;
  });
}