audit combobox

docs/CHECKLIST.md

@@ -130,12 +130,33 @@ 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 popover elevation, so
       dark mode's no-shadow rule applies to it too
+- [x] Combobox platform chrome — the popup border behind
+      `Theme::borders.overlays` (and dark mode), taking the surface color
+      where the platform paints none, and riding the popover elevation for
+      the light-mode shadow; the trigger is a plain `Input`, so it
+      already carries the full field treatment, and the chevron recenters on
+      the field's full height, border included; the popup mounts on
+      `deferred(anchored().offset(...))` like the Popover — out of the
+      wrapper's layout, one spacing gap below, window-clamped — and always
+      matches the combobox's width; the combobox itself is no longer full
+      width: it takes a compact default and style refinements on the builder
+      (`.w(...)`) set the width; the empty field keeps its placeholder while
+      focused (`Input::placeholder_when_focused`) and clicking into it opens
+      the options right away, with no keystroke needed
+- [x] Combobox platform chrome — the popup border behind
+      `Theme::borders.overlays` (and dark mode), taking the surface color
+      where the platform paints none; the trigger is a plain `Input`, so it
+      already carries the full field treatment, and the chevron recenters on
+      the field's full height, border included
 - [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
       determinate; replaces `Tab::busy`'s placeholder
 - [x] Input — single-line, password with reveal, multiline, undo/redo, actions
-      + key context, caret blink
+      + key context, caret blink (time-math driven: the focused field mounts a
+      repeating blink animation whose frames redraw the caret, the caret is
+      solid for one interval after each edit, and an idle unfocused page
+      schedules no frames)
 - [x] ScrollArea, Popover, Menu, Tooltip, Dialog / AlertDialog, Toast,
       Alert + alerts stack
 - [x] Select, Segmented, ContextMenu, EmptyState, Badge