- useMonospaceClasses hook calls electronAPI.monospace.getSettings()
and toggles body.mono-{jetbrains-mono,fira-code} and
body.mono-ligatures-{on,off} classes
- Add --font-mono-active and --font-mono-feature tokens in globals.css
- Apply to code/pre/kbd/samp so all code rendering picks up the active
monospace font + ligature settings