The `withPropmptBoxOptions` method is used to provide prompt box options to the `AiChat` component.
The promptBoxOptions is an optional property. It is used to configure the prompt box.
If provided, it should be an object properties from the table listed below.

* Type: `PromptBoxOptions`
* Optional
* Usage:

```javascript
const aiChat = createAiChat()
    .withPromptBoxOptions({
        autoFocus: false,
        placeholder: 'Type your message here...'
    });
```

| Property | Type |  Default |Description |
| --- | --- | --- | --- |
| `autoFocus` | `boolean` | `true` | If `true`, the prompt box will be focused when the component is mounted. |
| `placeholder` | `string` | - | The placeholder text of the prompt box. |
