Implement prefers-reduced-motion

[MaybeThisIsRu]

Precheck

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Prerequisites

• I have searched open and closed issues to make sure that the feature has not yet been requested.

Feature request

Is your feature request related to a problem? Please describe.
So, I was feeling a bit dizzy today and decided to turn off animations from GNOME. Using the CSS media query prefers-reduced-motion, I'm now able to get Firefox (app) and a bunch of websites to not show animations or reduce them as much as possible. Curiously, I tried to see if Plausible's dashboard would do anything different with animations off on my system. Nothing that I can see so far.

How would you like it to work
Replace the rotating loading indicator with a static wait icon.

Screenshots (If applicable)
Currently, Plausible shows an animated loading indicator for many actions. This is Firefox's tab loading icon after animations are turned off. A similar solution for Plausible could come in handy.