Edits drive the Editing (right) column only. Tracking (--bn-track-*) is omitted — it exists in tokens-desktop.css but no component consumes letter-spacing yet, so it would be a dead knob here.
Hold Space to peek the original · ⌘Z undo ·
left column is the reference (known-good), right is the editing space — judge whether the right feels as resolved, not whether it matches.
Export — paste-ready token block + JSON
Paste to Claude: "make tokens-desktop.css like this" (or "save as version 3").