audit select

docs/CHECKLIST.md

@@ -9,9 +9,6 @@ is the first downstream consumer; its screens drive the order.
 
 ## Next
 
-- [ ] **Select platform chrome** — the input treatment on the trigger; the
-      popup border behind `Theme::borders.overlays`.
-
 ## Queue — to follow
 
 Platform metric adoption continues one component at a time; each stop goes
@@ -74,7 +71,9 @@ Gaps surfaced by the signed comparison; ordered by signed's usage.
       metrics and the full radius ladder per platform, Linux root fonts
       (GNOME gsettings `font-name`, KDE `kdeglobals font=`), per-source
       border + focus chrome (`Theme::borders`), and a per-platform spacing
-      unit (`Theme::spacing`). Components adopt the tokens one by one
+      unit (`Theme::spacing`); overlay borders engage in dark mode, where
+      the elevation shadow barely reads and floating layers separate by
+      border instead. Components adopt the tokens one by one
       (see Next and Queue)
 
 ### icons (`crates/icons`)
@@ -103,6 +102,13 @@ Gaps surfaced by the signed comparison; ordered by signed's usage.
       typically small ghost buttons; a docked click activates the control
       without reaching the field's caret handler, and the text region shrinks
       to make room
+- [x] Select platform chrome — the trigger takes the input treatment: the
+      hairline border always painted, sized outside the stated field height
+      and taking the fill's color where the platform paints none; open
+      recolors the border on Windows / KDE and paints the accent ring on
+      macOS / GNOME, so the trigger matches a focused field; the menu
+      popup's border sits behind `Theme::borders.overlays`, disappearing
+      into the surface where the platform paints none
 - [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