fix: guard claim-link entries against stale indices and dead groups

ClaimLink/ClaimLinkRegistry.cs

@@ -63,14 +63,19 @@ public class ClaimLinkRegistry
         return null;
     }
 
-    public void AddEntry(string uid, int groupId, int claimIndex)
+    public bool AddEntry(string uid, int groupId, int claimIndex)
     {
+        if (ClaimLinkCommandListener.PendingLoads.ContainsKey(uid))
+            return false;
+        if (!Exists(groupId))
+            return false;
         if (!entries.TryGetValue(uid, out var groups))
             entries[uid] = groups = new();
         if (!groups.TryGetValue(groupId, out var claims))
             groups[groupId] = claims = new();
         claims.Add(claimIndex);
         Save();
+        return true;
     }
 
     public void RemoveEntry(string uid, int groupId, int claimIndex)
@@ -93,6 +98,7 @@ public class ClaimLinkRegistry
                 if (claims[i] > removedIndex)
                     claims[i]--;
         }
+
         Prune();
         Save();
     }
@@ -119,6 +125,7 @@ public class ClaimLinkRegistry
             if (i >= 0)
                 claims[i] = newIndex;
         }
+
         Save();
     }
 
@@ -170,15 +177,15 @@ public class ClaimLinkRegistry
     {
         var entryList = new List<ClaimLinkEntrySaveData>();
         foreach (var (uid, groups) in entries)
-        foreach (var (groupId, claims) in groups)
-            entryList.Add(
-                new ClaimLinkEntrySaveData
-                {
-                    OwnerPlayerUid = uid,
-                    GroupId = groupId,
-                    ClaimIndicies = new(claims),
-                }
-            );
+            foreach (var (groupId, claims) in groups)
+                entryList.Add(
+                    new ClaimLinkEntrySaveData
+                    {
+                        OwnerPlayerUid = uid,
+                        GroupId = groupId,
+                        ClaimIndicies = new(claims),
+                    }
+                );
 
         saveGame.StoreData(
             SaveKey,