The CSS theme-variable reference documents the dashboard/agent web-UI
stylesheets, so it belongs under docs/web-ui/ alongside shape/dashboard/
agent. Wire it into the web-ui.md index (split list + reading path) and
the CLAUDE.md file map. Closes#1405.
Lists all variables declared in base.css with their hex values,
Catppuccin Mocha names, and intended use. Includes a common-mistakes
table mapping the wrong names (--text, --mauve, --surface0/1/2, etc.)
to the correct ones, plus a usage guide for the most common patterns
(dropdowns, hover states, active tabs, badges).