Add navmap beacons (#19388)

Content.Shared/Pinpointer/NavMapComponent.cs

@@ -9,8 +9,14 @@ namespace Content.Shared.Pinpointer;
 [RegisterComponent, NetworkedComponent]
 public sealed partial class NavMapComponent : Component
 {
+    /*
+     * Don't need DataFields as this can be reconstructed
+     */
+
     [ViewVariables]
     public readonly Dictionary<Vector2i, NavMapChunk> Chunks = new();
+
+    [ViewVariables] public readonly List<SharedNavMapSystem.NavMapBeacon> Beacons = new();
 }
 
 public sealed class NavMapChunk