Surfaces and text now use Open Props --color-1 through --color-16.
Change --palette-hue to retheme entire site from one value.
Links stay fixed blue (oklch hue 250). State colors (ok/warn/error/info)
use harmonized oklch at fixed hues — same lightness/chroma, independent
of palette. Light mode flips the --color-N mapping.
Removes all color-mix() accent variants — direct oklch values instead.
ASW tokens referenced --gray-13, --gray-14, --gray-15 which don't
exist in Open Props (stops at --gray-12). All text and surface
colors resolved to nothing — invisible text in light mode.
Remap: 13→10, 14→11, 15→12.
