Implement visual testing

[bedrich-schindler]

The task is to create visual snapshot test for a simple component (e.g. <Badge /> or such) using Playwright component testing tool.

The aim is to have a working demo to serve as bases for discussion before we add tests for other components.

[bedrich-schindler]

We have agreed we want to have test in TS without type checking enabled due to ongoing transformation of whole stack to TS.