port(m1): wave 7j — Material/Plane/Socket overloads + IDictionary extension (24->12)

- Material.SetVector(int nameID, Vector4); Plane(Vector3, float d) ctor; Socket.On
  (SocketIOEventTypes, callback) overload.
- Global GetValueOrDefault(this IDictionary<,>) extension — the BCL form only binds to
  IReadOnlyDictionary, so the IDictionary call mis-resolved to JsonDataExtension.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

SVSim.BattleEngine/Shim/View/SettingsUiStubs.cs

@@ -142,6 +142,7 @@ namespace BestHTTP.SocketIO
     {
         public string Id => "";
         public Socket On(string eventName, SocketIOCallback callback) => this;
+        public Socket On(BestHTTP.SocketIO.SocketIOEventTypes type, SocketIOCallback callback) => this;
         public Socket Off(string eventName) => this;
         public Socket Off() => this;
         public Socket Emit(string eventName, params object[] args) => this;