bug#52840: cuirass/UI: don't use color as only source of information

[raingloom]

This is one of the most basic accessibility principles, I think Cuirass
should adhere to it.
Specifically on pages like this:
https://ci.guix.gnu.org/build/251721/details
the weather field is just a colored circle.
There is no reason to hide the text behind a hover action, especially
since not all input devices support that.
Also, not all output devices support color. And obviously, colorblind
people exist too.