Limit maximum capacity of fillable cluster grenades (#34281)

* Limit maximum capacity of fillable cluster grenades

* Swap GrenadeCount method for component property

Content.Shared/Explosion/Components/ScatteringGrenadeComponent.cs

@@ -27,7 +27,7 @@ public sealed partial class ScatteringGrenadeComponent : Component
     /// <summary>
     /// If we have a pre-fill how many more can we spawn.
     /// </summary>
-    [AutoNetworkedField]
+    [ViewVariables(VVAccess.ReadOnly), AutoNetworkedField]
     public int UnspawnedCount;
 
     /// <summary>
@@ -36,6 +36,12 @@ public sealed partial class ScatteringGrenadeComponent : Component
     [DataField]
     public int Capacity = 3;
 
+    /// <summary>
+    /// Number of grenades currently contained in the cluster (both spawned and unspawned)
+    /// </summary>
+    [ViewVariables(VVAccess.ReadOnly)]
+    public int Count => UnspawnedCount + Container.ContainedEntities.Count;
+
     /// <summary>
     /// Decides if contained entities trigger after getting launched
     /// </summary>