feat: add force disconnect handling and improve user ban notifications

src/EchoHub.Client/AppOrchestrator.cs

@@ -830,25 +830,33 @@ public sealed class AppOrchestrator : IDisposable
             InvokeUI(() =>
             {
                 _mainWindow.AddSystemMessage(channelName, $"{username} was kicked{reasonText}");
-                if (username.Equals(_currentUsername, StringComparison.OrdinalIgnoreCase))
-                {
-                    _mainWindow.AddSystemMessage(channelName, "You were kicked from this channel.");
-                }
             });
         };
 
         connection.OnUserBanned += (username, reason) =>
         {
+            var reasonText = reason is not null ? $" ({reason})" : "";
             InvokeUI(() =>
             {
-                if (username.Equals(_currentUsername, StringComparison.OrdinalIgnoreCase))
+                // Show ban notification for other users in the channel
+                if (!username.Equals(_currentUsername, StringComparison.OrdinalIgnoreCase))
                 {
-                    _mainWindow.ShowError("You have been banned from this server.");
-                    HandleDisconnect();
+                    var channel = _mainWindow.CurrentChannel;
+                    if (!string.IsNullOrEmpty(channel))
+                        _mainWindow.AddSystemMessage(channel, $"{username} was banned{reasonText}");
                 }
             });
         };
 
+        connection.OnForceDisconnect += reason =>
+        {
+            InvokeUI(() =>
+            {
+                _mainWindow.ShowError(reason);
+                HandleDisconnect();
+            });
+        };
+
         connection.OnMessageDeleted += (channelName, messageId) =>
         {
             InvokeUI(() =>

src/EchoHub.Client/Services/EchoHubConnection.cs

@@ -18,6 +18,7 @@ public sealed class EchoHubConnection : IAsyncDisposable
     public event Action<string, string?>? OnUserBanned;
     public event Action<string, Guid>? OnMessageDeleted;
     public event Action<string>? OnChannelNuked;
+    public event Action<string>? OnForceDisconnect;
     public event Action<string>? OnError;
     public event Action<string>? OnConnectionStateChanged;
     public event Action? OnReconnected;
@@ -105,6 +106,11 @@ public sealed class EchoHubConnection : IAsyncDisposable
             OnChannelNuked?.Invoke(channelName);
         });
 
+        _connection.On<string>(nameof(Core.Contracts.IEchoHubClient.ForceDisconnect), reason =>
+        {
+            OnForceDisconnect?.Invoke(reason);
+        });
+
         _connection.On<string>(nameof(Core.Contracts.IEchoHubClient.Error), message =>
         {
             OnError?.Invoke(message);

src/EchoHub.Client/UI/MainWindow.cs

@@ -197,6 +197,7 @@ public sealed class MainWindow : Runnable
             WordWrap = true
         };
         _inputField.KeyDown += OnInputKeyDown;
+        _inputField.ContentsChanged += OnInputContentsChanged;
         _inputFrame.Add(_inputField);
         Add(_inputFrame);
 
@@ -388,6 +389,31 @@ public sealed class MainWindow : Runnable
         }
     }
 
+    private bool _suppressEmojiReplace;
+
+    private void OnInputContentsChanged(object? sender, ContentsChangedEventArgs e)
+    {
+        if (_suppressEmojiReplace)
+            return;
+
+        var text = _inputField.Text;
+        if (string.IsNullOrEmpty(text))
+            return;
+
+        var replaced = EmojiHelper.ReplaceEmoji(text);
+        if (replaced == text)
+            return;
+
+        // Calculate where cursor should land after replacement
+        var lengthDelta = replaced.Length - text.Length;
+        var newCol = Math.Max(0, _inputField.CurrentColumn + lengthDelta);
+
+        _suppressEmojiReplace = true;
+        _inputField.Text = replaced;
+        _inputField.InsertionPoint = new System.Drawing.Point(newCol, _inputField.CurrentRow);
+        _suppressEmojiReplace = false;
+    }
+
     /// <summary>
     /// Tab-complete slash commands in the input field.
     /// </summary>