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.Core/World/WorldEntity.cs

@@ -30,6 +30,22 @@ public sealed class WorldEntity
     /// </summary>
     public required IReadOnlyList<MeshRef> MeshRefs { get; set; }
 
+    /// <summary>
+    /// Whether the root PartArray participates in mesh drawing. Live-object
+    /// PhysicsState NoDraw/Hidden transitions change this without destroying
+    /// the entity or its scripts, particles, lights, cell identity, or cached
+    /// mesh resources. Dat/static entities remain visible by default.
+    /// </summary>
+    public bool IsDrawVisible { get; set; } = true;
+
+    /// <summary>
+    /// Retained-tree visibility inherited from attached ancestors. Retail
+    /// draws child physics objects through their parent hierarchy; acdream
+    /// flattens them into independent draw entries, so this separate bit keeps
+    /// ancestor suppression out of the child's own PhysicsState.
+    /// </summary>
+    public bool IsAncestorDrawVisible { get; set; } = true;
+
     /// <summary>
     /// Stable Setup-part-indexed poses used by attachment and effect hooks.
     /// Unlike <see cref="MeshRefs"/>, this array never compacts around a DAT