Illegible search input text in `spago docs` app (low contrast) in system dark mode

[pete-murphy]

The <input> used for searching in the spago docs app has color: hsl(221.25, 21.62%, 14.51%); with no background-color set:

The background color for the <input> inherits from the default user agent stylesheet, which uses the Field system color for inputs. Because we also have

:root {
  color-scheme: light dark;
}

in our CSS (I think this is coming from the Pursuit styles defined in purescript repo), the resolved value of Field will vary depending on color scheme.

In dark color scheme, Field is a dark gray which I think varies a bit depending on browser, but in any case the dark text color does not respond to color scheme and the result is that the input value is illegible. Here's a screenshot from Chrome on Mac OS with system them set to dark (the input value is set to "pure"):