Colour mismatch for `foreground-primary` and `foreground-accent-default` in dark mode

- `@freenow/wave` version: `2.27.1`

### Relevant code

The [colours](https://wave.free-now.com/?path=/docs/essentials-colors--docs) for `foreground-primary` and `foreground-accent-default` overlap in *dark mode*. As a consequence, users are unable to differentiate links from foreground text.

### What was expected to happen?

Foreground and Accent texts should be differentiable in both light and dark modes. The decision from design is to change both `foreground-primary` and `foreground-accent-default` colours.

`foreground-primary` / dark mode / is `FCFCFC` _(`ref/pallete/neutral-99`)_
`foreground-accent-default` / dark mode / is `F4CED4` _(`ref/pallete/red-90`)_