RadioGroup from @kibrisyazilim/design-system. Use via `window.KibrisDS.RadioGroup` (bundle loaded from the root `_ds_bundle.js`).

## Props

```ts
interface RadioGroupProps {
  /** Shared `name` for every radio inside. */
  name: string;
  /** Lays the options out in a row instead of a column. */
  direction?: "vertical" | "horizontal";
  children?: React.ReactNode;
  className?: string;
  /** Visible label. Omit only when a label exists elsewhere. */
  label?: React.ReactNode;
  /** Helper text under the control. Hidden while `error` is set. */
  hint?: React.ReactNode;
  /** Error message. Its presence also puts the control in its invalid state. */
  error?: React.ReactNode;
  /** Marks the field required and appends an asterisk to the label. */
  required?: boolean;
  /** Stretches the field to the width of its container. */
  fullWidth?: boolean;
}
```