fix(ui): gate — no void frames around the login wormhole; vitals icons centered

The login tunnel now covers from the first world-facing frame (the
sky-void backdrop can never present pre-tunnel) and holds through an
atomic tunnel-to-world swap at reveal completion — the void is
structurally unreachable on both edges, pinned by frame-sequence tests
across WorldSceneRenderer/WorldRevealCoordinator/LocalPlayerTeleport-
Controller/RuntimeWorldTransitState. Vitals detail icons draw at their
authored centered offsets in both stacked and side-by-side layouts.
Implemented and live-probed by the fix agent; finalized by the lead
after the agent parked post-verification (gates re-run green:
App 5512/3, Runtime 1747/0).

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

src/AcDream.App/UI/Testing/RetailUiAutomationProbe.cs

@@ -148,6 +148,21 @@ public sealed class RetailUiAutomationProbe
         return true;
     }
 
+    /// <summary>
+    /// Raw synthetic drag between two canvas points (gate-fix round,
+    /// 2026-08-17): the vitals icon-centering verify needs the vitals window
+    /// RESIZED away from its authored width (the retail L3/R3 center anchors
+    /// only become observable on a non-authored meter width), and window
+    /// resize rides an edge-grip drag no element/item-addressed drag form can
+    /// express. Same synthetic <see cref="UiRoot"/> pointer route as
+    /// <see cref="DragItemToElement"/> — never the OS cursor.
+    /// </summary>
+    public bool DragAtPoint(int startX, int startY, int endX, int endY)
+    {
+        DragAt(startX, startY, endX, endY);
+        return true;
+    }
+
     /// <summary>
     /// 2026-08-17 morning gate: synthetic pointer HOVER (no click) at an
     /// element's center, for rollover/tooltip verification. Deliberately