TextField: focused vs. error borders

[jpnurmi]

The orange accent color used for focus and the red error color are so close that the focused state can be confused with an error state.

Originally posted by @elioqoshi in canonical/ubuntu-desktop-installer#1450 (comment)

[Feichtmeier]

Since the red is already very light the only way to improve this in the dark theme I see is to lighten up the primary colour for selected fields

[Feichtmeier]

we could also try to generally make those active borders look different. very transparent and 2px, like.... in gnome 🤷 🐾

[Feichtmeier]

I think this is rather the orange discussion again, i.e. a general problem with the main ubuntu color
We could make the focus ring blue for the default theme, but then it is inconsistent with the gnome themes. We've experienced dozens of time with this on the yaru gnome themes but always returned to orange because of gtk limitations