test(ui): vitals — toggle verified through the real UiRoot mouse path

Two end-to-end additions to the fixture toggle suite: a body press through
UiRoot.OnMouseDown's actual hit test + bubble (left toggles, right toggles),
and a press on the authored top drag bar (0x1000063C) arming the window
move WITHOUT toggling — the retail Dragbar-consumes-the-press semantics
proven against the real input path, not just injected OnEvent calls.

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

tests/AcDream.App.Tests/UI/Layout/VitalsDetailToggleTests.cs

@@ -189,6 +189,58 @@ public class VitalsDetailToggleTests
         Assert.NotEqual(RetailUiStateIds.ShowDetail, rootB.ActiveRetailStateId);
     }
 
+    // ── End-to-end: the REAL mouse path (hit test + bubble) ──────────────────
+
+    [Fact]
+    public void MouseDown_OnWindowBody_TogglesThroughTheRealHitPath()
+    {
+        var (root, vitalsRoot) = MountedWindow();
+
+        // Body press: the stamina meter's center (meters are ClickThrough, so
+        // the hit lands on the window content and bubbles to the vitals root).
+        root.OnMouseDown(UiMouseButton.Left, 90, 59);
+        root.OnMouseUp(UiMouseButton.Left, 90, 59);
+        Assert.Equal(RetailUiStateIds.HideDetail, vitalsRoot.ActiveRetailStateId);
+
+        // Right press toggles too (retail dwParam1 0xA).
+        root.OnMouseDown(UiMouseButton.Right, 90, 59);
+        root.OnMouseUp(UiMouseButton.Right, 90, 59);
+        Assert.Equal(RetailUiStateIds.ShowDetail, vitalsRoot.ActiveRetailStateId);
+    }
+
+    [Fact]
+    public void MouseDown_OnTopDragBar_MovesArmWithoutToggling()
+    {
+        var (root, vitalsRoot) = MountedWindow();
+
+        // The authored top drag bar (0x1000063C) spans content-local
+        // (5,0)-(155,5) → canvas y just below the window top. Retail's
+        // Dragbar consumes the press; the toggle must not fire.
+        root.OnMouseDown(UiMouseButton.Left, 90, 32);
+        root.OnMouseUp(UiMouseButton.Left, 90, 32);
+        Assert.NotEqual(RetailUiStateIds.HideDetail, vitalsRoot.ActiveRetailStateId);
+        Assert.NotEqual(RetailUiStateIds.ShowDetail, vitalsRoot.ActiveRetailStateId);
+    }
+
+    private static (UiRoot Root, UiVitalsRoot VitalsRoot) MountedWindow()
+    {
+        var root = new UiRoot { Width = 800, Height = 600 };
+        var layout = FixtureLoader.LoadVitals();
+        RetailWindowFrame.Mount(root, layout.Root, static _ => (0u, 0, 0),
+            new RetailWindowFrame.Options
+            {
+                WindowName = WindowNames.Vitals,
+                Chrome = RetailWindowChrome.Imported,
+                Left = 10f,
+                Top = 30f,
+                ResizeX = true,
+                ResizeY = false,
+                MinWidth = 40f,
+                ContentClickThrough = false,
+            });
+        return (root, Assert.IsType<UiVitalsRoot>(layout.Root));
+    }
+
     // ── Helpers ──────────────────────────────────────────────────────────────
 
     /// <summary>Delivers a press to <paramref name="root"/> as UiRoot's bubble