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

Multi-line text field. Height comes from `rows`.

## Props

```ts
interface TextareaProps {
  size?: "sm" | "md" | "lg";
  /** Which resize handles the user gets. Defaults to vertical only. */
  resize?: "none" | "vertical" | "both";
  className?: string;
  id?: string;
  style?: CSSProperties;
  children?: React.ReactNode;
  /** 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;
  /** Stretches the field to the width of its container. */
  fullWidth?: boolean;
}
```