Fix FilePreview readme

### Description

Fix table view:

<img width="2362" height="636" alt="Image" src="https://github.com/user-attachments/assets/6aaced9e-e566-478e-a707-434afd1d9a86" />

### Additional context

_No response_

### Validations

- [x] Check that there isn't [already an issue](https://github.com/gravity-ui/uikit/issues) that pursue the same goal to avoid creating a duplicate.