Let's rethink animations in automatic regression testing context

[mfranzke]

Using a fixed 2000ms timeout can slow down tests and lead to flakiness. Consider waiting for a specific element state, CSS transition end, or network idle event instead of an arbitrary delay.

Originally posted by @Copilot in #4244 (comment)

We should check whether we could either determine the state of an animation e.g. via the Web Animation API, or disable animations by setting their duration to 0 within visual regression, or let Playwright run with the prefers-reduced-motion setting.