feat(vfx): port retail hidden and teleport presentation

Preserve canonical live-object ownership across Hidden transitions and remote teleport placement so effects, collision, streaming, and targeting remain synchronized.

src/AcDream.App/Rendering/EntityPhysicsHost.cs

@@ -135,6 +135,19 @@ public sealed class EntityPhysicsHost : IPhysicsObjHost
     /// registry.</summary>
     public void NotifyExitWorld() => _targetManager.NotifyVoyeurOfEvent(TargetStatus.ExitWorld);
 
+    /// <summary>
+    /// A Hidden object remains logically alive but is removed from the cell
+    /// lookup/interaction surface. Retail's DetectionManager sends
+    /// <c>LeftDetection</c> from <c>CObjCell::hide_object</c>; that manager is
+    /// not ported yet, so the App bridges the same unavailability edge through
+    /// the existing target fan-out. The non-Ok update tears down watcher
+    /// MoveTo/Sticky consumers, and the watched-role table is cleared so an
+    /// UnHide re-subscription receives a fresh initial snapshot. The object's
+    /// own watcher role is deliberately preserved.
+    /// </summary>
+    public void NotifyHidden() =>
+        _targetManager.NotifyVoyeurOfEventAndClear(TargetStatus.ExitWorld);
+
     /// <summary>R5-V3 (#171): retail <c>CPhysicsObj::teleport_hook</c>'s tail
     /// (0x00514ed0 @0x00514f1b-0x00514f28) — <c>TargetManager::ClearTarget</c>
     /// (drop this entity's OWN subscription) then