feat: release v0.2.3 with moderation system, private channels, and UI enhancements

src/Directory.Build.props

@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup>
-    <Version>0.2.2</Version>
+    <Version>0.2.3</Version>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <NoWarn>$(NoWarn);CS1591</NoWarn>
   </PropertyGroup>

src/EchoHub.Client/UI/MainWindow.cs

@@ -40,7 +40,7 @@ public sealed class MainWindow : Runnable
     // Cached Key constants — compare via .KeyCode to avoid Key.Equals (which also checks Handled)
     private static readonly Key EnterKey = Key.Enter;
     private static readonly Key NewlineKey = Key.N.WithCtrl;
-    private static readonly Key CtrlCKey = Key.C.WithCtrl;
+    private static readonly Key AltQKey = Key.Q.WithAlt;
     private static readonly Key TabKey = Key.Tab;
 
     // Available slash commands for Tab autocomplete
@@ -240,7 +240,7 @@ public sealed class MainWindow : Runnable
         _messageList.ViewportChanged += (_, _) => OnChatViewportChanged();
         _chatFrame.ViewportChanged += (_, _) => OnChatViewportChanged();
 
-        // Window-level key handling for Ctrl+C (quit), F2 (toggle users panel)
+        // Window-level key handling for Alt+Q (quit), F2 (toggle users panel)
         KeyDown += OnWindowKeyDown;
     }
 
@@ -379,7 +379,7 @@ public sealed class MainWindow : Runnable
             }
             e.Handled = true;
         }
-        else if (e.KeyCode == CtrlCKey.KeyCode)
+        else if (e.KeyCode == AltQKey.KeyCode)
         {
             _app.RequestStop();
             e.Handled = true;
@@ -432,7 +432,7 @@ public sealed class MainWindow : Runnable
 
     private void OnWindowKeyDown(object? sender, Key e)
     {
-        if (e.KeyCode == CtrlCKey.KeyCode)
+        if (e.KeyCode == AltQKey.KeyCode)
         {
             _app.RequestStop();
             e.Handled = true;

src/EchoHub.Core/Constants/HubConstants.cs

@@ -4,7 +4,7 @@ public static class HubConstants
 {
     public const string ChatHubPath = "/hubs/chat";
     public const string DefaultChannel = "general";
-    public const int DefaultHistoryCount = 50;
+    public const int DefaultHistoryCount = 100;
     public const int MaxMessageLength = 2000;
     public const int MaxFileSizeBytes = 10 * 1024 * 1024; // 10 MB
     public const int MaxAvatarSizeBytes = 2 * 1024 * 1024; // 2 MB