[TextPlaceholder]: component is empty on Safari

## Steps to Reproduce

just open component in Safari - https://uui.epam.com/documents?id=textPlaceholder&mode=doc&category=components&theme=promo

## Actual result

component is empty (no grey squares are displayed)

## Expected result

grey squares are displayed (depends on **wordCount** prop)

## Environment

* UUI version: 6.5.2
* Browser name: Safari (v 26.6.2)
* Operating System: macOS Tahoe 26.6.2

Open the linked TextPlaceholder documentation example in Safari and inspect the component entry point responsible for rendering the placeholder. Reproduce the empty state with the documented wordCount prop, then verify that the expected grey squares appear in Safari without changing the behavior described for other browsers.

Written by the indexing model from the issue text.