- The lane terminal (xterm) takes its palette from the selected DARK theme —
it stays dark in light mode, as a terminal should — and repaints live when
the theme changes (`client/src/lib/terminalTheme.ts`).
- Charts on the Dashboard and Workflows pages draw their grid, axes, labels
and tooltips from theme tokens instead of hardcoded near-black/white, and
the activity heatmap ramps from the page surface to the accent, so it reads
on every theme instead of going near-black on light ones.
- Status/brand text that only worked on dark backgrounds
(`text-*-300/400`) gets a darker light-mode shade (`text-*-700
dark:text-*-300`) across sessions, conversations, workflows, config and
settings. Categorical chart colours are kept.
