audit tooltip

docs/CHECKLIST.md

@@ -14,7 +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.
 
-- [ ] **Tooltip platform chrome** — overlay border gate.
 - [ ] **Alert platform chrome** — overlay border gate.
 - [ ] **Combobox platform chrome** — popup border behind
       `Theme::borders.overlays`; the trigger follows the input stop's field
@@ -118,6 +117,16 @@ 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; the pill rides the popover elevation,
       so dark mode's no-shadow rule applies to it too
+- [x] Tooltip platform chrome — the panel 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; anchored tooltips hang below the
+      hovered parent (`Tooltip::anchored(text, id)`) so they never cover it —
+      the element records its painted bounds with `record_anchor_bounds`
+      (`Button` does), the panel hangs below that with the spacing gap, and
+      it flips above the parent when it would overflow the window bottom
+      (the panel records its own height after the first frame); unanchored
+      tooltips fall back to the cursor-offset wrapper
 - [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