Импорт групповых чатом, мелкие правки, внешний вид чата, GIF тип

apps/server-net/src/Modules/Chats/Infrastructure/SignalR/ChatHub.cs

@@ -23,6 +23,7 @@ public sealed class ChatHub : Hub
     private static readonly ConcurrentDictionary<string, ConcurrentDictionary<string, ParticipantInfo>> _groupCallParticipants = new();
 
     public static int OnlineUsersCount => _userConnections.Count;
+    public static bool IsUserOnline(string userId) => _userConnections.ContainsKey(userId);
 
     private readonly ISender _sender;
     private readonly IUserContext _userContext;