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/World/LiveEntityTeardown.cs

@@ -0,0 +1,33 @@
+namespace AcDream.App.World;
+
+/// <summary>
+/// Runs the independent owners that participate in one live incarnation's
+/// teardown without letting an earlier callback strand later state. Retail's
+/// object destruction drains these owners as separate lifecycle steps; the App
+/// composition callback must preserve that symmetry even when a plugin,
+/// renderer, or effect sink throws.
+/// </summary>
+internal static class LiveEntityTeardown
+{
+    internal static void Run(IEnumerable<Action> cleanups)
+    {
+        ArgumentNullException.ThrowIfNull(cleanups);
+        List<Exception>? failures = null;
+        foreach (Action cleanup in cleanups)
+        {
+            try
+            {
+                cleanup();
+            }
+            catch (Exception error)
+            {
+                (failures ??= []).Add(error);
+            }
+        }
+
+        if (failures is not null)
+            throw new AggregateException(
+                "One or more live-entity component teardown steps failed.",
+                failures);
+    }
+}