Replace SpriteStateChange construction action with AppearanceChange (#15914)

Content.Server/Construction/Completions/AppearanceChange.cs

@@ -0,0 +1,42 @@
+using Content.Server.Construction.Components;
+using Content.Shared.Construction;
+using JetBrains.Annotations;
+using Robust.Server.GameObjects;
+
+namespace Content.Server.Construction.Completions;
+
+[UsedImplicitly]
+[DataDefinition]
+public sealed class AppearanceChange : IGraphAction
+{
+    /// <summary>
+    /// The appearance key to use.
+    /// </summary>
+    [DataField("key")]
+    public Enum Key = ConstructionVisuals.Key;
+
+    /// <summary>
+    /// The enum data to set. If not specified, will set the data to the name of the current edges' target node
+    /// (or the current node). This is because appearance changes are usually associated with reaching a new node.
+    /// </summary>
+    [DataField("data")]
+    public Enum? Data;
+
+    public void PerformAction(EntityUid uid, EntityUid? userUid, IEntityManager entityManager)
+    {
+        if (!entityManager.TryGetComponent(uid, out AppearanceComponent? appearance))
+            return;
+
+        if (Data != null)
+        {
+            entityManager.System<AppearanceSystem>().SetData(uid, Key, Data, appearance);
+            return;
+        }
+
+        var (node, edge) = entityManager.System<ConstructionSystem>().GetCurrentNodeAndEdge(uid);
+        var nodeName = edge?.Target ?? node?.Name;
+
+        if (nodeName != null)
+            entityManager.System<AppearanceSystem>().SetData(uid, Key, nodeName, appearance);
+    }
+}