Construction graph improvements (#17960)

Content.Shared/Construction/NodeEntities/StaticNodeEntity.cs

@@ -0,0 +1,28 @@
+using JetBrains.Annotations;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+
+namespace Content.Shared.Construction.NodeEntities;
+
+[UsedImplicitly]
+[DataDefinition]
+public sealed class StaticNodeEntity : IGraphNodeEntity
+{
+    [DataField("id", customTypeSerializer:typeof(PrototypeIdSerializer<EntityPrototype>))]
+    [ViewVariables(VVAccess.ReadWrite)]
+    public string? Id { get; }
+
+    public StaticNodeEntity()
+    {
+    }
+
+    public StaticNodeEntity(string id)
+    {
+        Id = id;
+    }
+
+    public string? GetId(EntityUid? uid, EntityUid? userUid, GraphNodeEntityArgs args)
+    {
+        return Id;
+    }
+}