.text-bg-* both (a) had a misleading prefix and (b) forced a black/white
foreground that fought the theme. The theme already provides separate,
theme-aware utilities: .text-* (color: var(--*-rgb)) and .bg-*
(background-color: var(--*-rgb)). Remove .text-bg-* and compose
.text-{ctx} + .bg-{ctx} instead.
Authored-by: Moko Consulting