The palette used absolute 256-color indices (`38;5;252`, `48;5;236`, …)
that terminals never remap to the active scheme: near-white body text
vanished on light backgrounds and fixed dark bubble fills put default
foreground text on dark blocks. Rebuild it from the standard 16-color
ANSI foregrounds plus SGR attributes, keep body text on the terminal
default foreground, replace filled background bubbles with foreground-only
left-gutter bars, and use reverse video for the active selection so every
grouping reads on any color scheme.
Turtle
87e25ef1fe