Honor reduced motion preference

[dstengele]

I am not sure if this has been a recent change, but in the current 2024.10 release, there are (in my opinion too long) animations when opening and closing modal dialogs, for example the entity view.
As modern operating systems have a function to set a preference for reduced motion in user interfaces which can also be queries in CSS (https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-reduced-motion), I would love for Home Assistant to honor this preference and disable most animations if it is set.
Aside from better accesibility for people with motion sickness this could also help with performance, see for example #13816 or #17941.