audit switch

docs/CHECKLIST.md

@@ -14,10 +14,6 @@ is the first downstream consumer; its screens drive the order.
 Platform metric adoption continues one component at a time; each stop goes
 through the review gate and a gallery pass.
 
-- [ ] **Switch platform chrome** — stated track and knob dims
-      (`switch_height` / `switch_width` / `switch_knob`, inset and travel
-      derived); borderless knob.
-
 Gaps surfaced by the signed comparison; ordered by signed's usage.
 
 - [ ] **Virtual list** — generic virtualized variable-height rows with a
@@ -143,6 +139,11 @@ Gaps surfaced by the signed comparison; ordered by signed's usage.
       `Theme::borders.overlays` (and dark mode), taking the surface color
       where the platform paints none; it rides the dialog elevation, so dark
       mode's no-shadow rule applies to it too
+- [x] Switch platform chrome — the track and knob take the stated
+      `switch_height` / `switch_width` / `switch_knob` (the knob's inset
+      derived to center it in the track, its travel from the remaining
+      width); the knob is borderless, and the track carries a debug selector
+      for headless geometry tests
 - [x] Button, Checkbox, Switch, Radio + RadioGroup, Toggle, Link, Slider,
       Progress, Avatar (image + seeded pixel-art fallback)
 - [x] Spinner — painted ring + rotating-icon variant, indeterminate and