feat(ui): vitals — click toggles retail's numeric/graphical detail modes

Port of gmVitalsUI's press toggle, derived end-to-end from the named
retail decomp + the authored DAT data (installed-DAT probe 2026-08-17):

- gmVitalsUI::ListenToElementMessage @0x004BFC00: mouse press (msg 0x1C,
  dwParam1 7=left or 0xA=right — the same param pair the spellbook's
  select/favorite handler @0x0048C033 disambiguates) flips
  SetState(m_state == HideDetail ? ShowDetail : HideDetail). Both floaty
  subclasses (gmFloatyVitalsUI 0x1000004D / gmFloatySideVitalsUI
  0x10000056) inherit it verbatim.
- UIElement::SetState @0x00464E70 cascades through the authored
  PassToChildren chain: root and meters author media-less
  HideDetail/ShowDetail StateDescs with PassToChildren=true.
- HideDetail (0x10000006) = the NUMERIC mode: the cur/max labels author
  {0x3B:false} (0x3B = invisible; UIElement::OnSetAttribute case 8
  @0x00462DAE is SetVisible(value == 0)), the 0x100004A9 overlays author
  File=0.
- ShowDetail (0x10000007) = the GRAPHICAL mode: labels author {0x3B:true}
  (numbers hidden); each bar shows its authored icon pair — dim back icon
  unclipped over the track, bright front icon clipped with the front
  container to the fill fraction (UIElement_Meter::DrawChildren
  @0x0046FBD0 clips the whole element-id-2 child; m_pcChildImage =
  GetChildRecursive(this, 2) @0x0046F7E3). Health heart 0x06007490/91
  (18x16 @66,0), stamina sword 0x06007492/93 (85x16 @32,0), mana scepter
  0x06007494/95 (100x16 @25,0) — identical authoring in both 0x2100006C
  and 0x21000075.
- Initial state is the authored Undef (numbers visible, no icons —
  visually HideDetail); retail's first press lands on HideDetail, then
  the pair toggles forever. NOT persisted: SaveScreenLayout @0x004EAD50
  writes window rects only, and no PlayerModule option is touched — the
  mode resets per session, per window.
- Presses on drag bars / resize grips do not toggle: retail's
  UIElement_Dragbar @0x0046C850 and UIElement_Resizebar @0x0046B930
  consume the press (return 2) before it can bubble to the root.

Implementation: new UiVitalsRoot behavioral widget registered for the
three gmVitals class ids (press handler + state flip over the existing
UiDatElement state machine); UiMeter absorbs the two 0x100004A9 overlays
(ConfigureDetailOverlay + ShowDetail-keyed draw, back unclipped / front
fill-clipped) and forwards the detail states to its absorbed text child;
UiText.ApplyDatState gains the same named-state-only 0x3B honor
UiDatElement already had (the DirectState 0x3B class stays gated — #408).

8 new fixture-driven conformance tests (toggle sequence, right-press,
label cascade, chrome exclusions, per-window independence, overlay
extraction). App suite Release live-DAT: 5495 passed / 3 skips.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/AcDream.App/UI/UiText.cs

@@ -386,6 +386,22 @@ public sealed class UiText : UiElement, IUiDatStateful
             && TryColor(color, out Vector4 resolvedColor))
             DefaultColor = resolvedColor;
 
+        // Per-state Invisible (dat property 0x3B): retail's SetState applies the
+        // committed state's properties through UIElement::OnSetAttribute, whose
+        // case 8 (@0x00462DAE, property id 0x33 + 8 = 0x3B) is
+        // `SetVisible(value == 0)`. Same NAMED-states-only scoping as
+        // UiDatElement.TrySetRetailState (a DirectState 0x3B is the
+        // construction-time "authored invisible" class — #408, separately
+        // gated). First consumer here: the vitals cur/max number labels
+        // (0x100000EB/ED/EF) author HideDetail={0x3B:false} /
+        // ShowDetail={0x3B:true} — the numbers hide when the click toggle
+        // switches the window to the graphical icon mode.
+        if (stateId != UiStateInfo.DirectStateId
+            && state is not null
+            && state.Properties.Values.TryGetValue(0x3Bu, out var invisibleProp)
+            && invisibleProp.Kind == UiPropertyKind.Bool)
+            Visible = !invisibleProp.BoolValue;
+
         // Retail's state cascade also swaps the element's AUTHORED string
         // when the incoming state carries its own 0x17 (the friends row's
         // status cell: 'Online'/'Offline' with per-state colors). Resolved