feat: add support for broadcasting and handling channel deletions across clients

src/EchoHub.Client/AppOrchestrator.cs

@@ -1071,6 +1071,15 @@ public sealed class AppOrchestrator : IDisposable
         _conn.MessageDeleted += (channelName, messageId) =>
             InvokeUI(() => _messageManager.RemoveMessage(channelName, messageId));
 
+        _conn.ChannelDeleted += channelName =>
+        {
+            InvokeUI(() =>
+            {
+                _conn.UntrackChannel(channelName);
+                _mainWindow.RemoveChannel(channelName);
+            });
+        };
+
         _conn.ChannelNuked += channelName =>
         {
             InvokeUI(() =>

src/EchoHub.Client/Services/ConnectionManager.cs

@@ -46,6 +46,7 @@ internal sealed class ConnectionManager : IAsyncDisposable
     public event Action<string, string?>? UserBanned;
     public event Action<string>? ForceDisconnected;
     public event Action<string, Guid>? MessageDeleted;
+    public event Action<string>? ChannelDeleted;
     public event Action<string>? ChannelNuked;
     public event Action<ChannelDto>? ChannelUpdated;
     public event Action<string>? Error;
@@ -300,6 +301,7 @@ internal sealed class ConnectionManager : IAsyncDisposable
         connection.OnUserBanned += (user, reason) => UserBanned?.Invoke(user, reason);
         connection.OnForceDisconnect += reason => ForceDisconnected?.Invoke(reason);
         connection.OnMessageDeleted += (ch, id) => MessageDeleted?.Invoke(ch, id);
+        connection.OnChannelDeleted += ch => ChannelDeleted?.Invoke(ch);
         connection.OnChannelNuked += ch => ChannelNuked?.Invoke(ch);
         connection.OnChannelUpdated += ch =>
         {

src/EchoHub.Client/Services/EchoHubConnection.cs

@@ -58,6 +58,7 @@ public sealed class EchoHubConnection : IAsyncDisposable
     public event Action<string, string, string?>? OnUserKicked;
     public event Action<string, string?>? OnUserBanned;
     public event Action<string, Guid>? OnMessageDeleted;
+    public event Action<string>? OnChannelDeleted;
     public event Action<string>? OnChannelNuked;
     public event Action<string>? OnForceDisconnect;
     public event Action<string>? OnError;
@@ -144,6 +145,11 @@ public sealed class EchoHubConnection : IAsyncDisposable
             OnMessageDeleted?.Invoke(channelName, messageId);
         });
 
+        _connection.On<string>(nameof(Core.Contracts.IEchoHubClient.ChannelDeleted), channelName =>
+        {
+            OnChannelDeleted?.Invoke(channelName);
+        });
+
         _connection.On<string>(nameof(Core.Contracts.IEchoHubClient.ChannelNuked), channelName =>
         {
             OnChannelNuked?.Invoke(channelName);