Fixed migration for 2.0.0

LightlessSync/UI/SyncshellFinderUI.cs

@@ -474,7 +474,8 @@ public class SyncshellFinderUI : WindowMediatorSubscriberBase
     private async Task RefreshSyncshellsAsync(string? gid = null)
     {
         var syncshellBroadcasts = _broadcastScannerService.GetActiveSyncshellBroadcasts();
-        _currentSyncshells = [.. _pairManager.GroupPairs.Select(g => g.Key)];
+        var snapshot = _pairUiService.GetSnapshot();
+        _currentSyncshells = [.. snapshot.GroupPairs.Keys];
 
         _recentlyJoined.RemoveWhere(gid =>
             _currentSyncshells.Exists(s => string.Equals(s.GID, gid, StringComparison.Ordinal)));