feat: Implement chat line wrapping and viewport resizing for message display

src/EchoHub.Client/UI/ChatRenderer.cs

@@ -35,6 +35,58 @@ public partial class ChatLine
 
     public override string ToString() => string.Concat(Segments.Select(s => s.Text));
 
+    /// <summary>
+    /// Wrap this line into multiple lines that fit within the given width.
+    /// Continuation lines are indented with the specified number of spaces.
+    /// </summary>
+    public List<ChatLine> Wrap(int width, int continuationIndent = 0)
+    {
+        if (width <= 0 || TextLength <= width)
+            return [this];
+
+        var results = new List<ChatLine>();
+        var currentSegments = new List<ChatSegment>();
+        int col = 0;
+
+        foreach (var segment in Segments)
+        {
+            int segPos = 0;
+            while (segPos < segment.Text.Length)
+            {
+                int remaining = width - col;
+                if (remaining <= 0)
+                {
+                    // Emit current line and start a new one
+                    results.Add(new ChatLine(currentSegments));
+                    currentSegments = [];
+
+                    // Add indent for continuation
+                    if (continuationIndent > 0)
+                    {
+                        currentSegments.Add(new ChatSegment(new string(' ', continuationIndent), null));
+                        col = continuationIndent;
+                    }
+                    else
+                    {
+                        col = 0;
+                    }
+
+                    remaining = width - col;
+                }
+
+                int take = Math.Min(segment.Text.Length - segPos, remaining);
+                currentSegments.Add(new ChatSegment(segment.Text.Substring(segPos, take), segment.Color));
+                col += take;
+                segPos += take;
+            }
+        }
+
+        if (currentSegments.Count > 0)
+            results.Add(new ChatLine(currentSegments));
+
+        return results;
+    }
+
     /// <summary>
     /// Parse a string containing ANSI 24-bit color escape codes into colored segments.
     /// Format: \x1b[38;2;R;G;Bm (foreground color), \x1b[0m (reset)

src/EchoHub.Client/UI/MainWindow.cs

@@ -45,6 +45,7 @@ public sealed class MainWindow : Runnable
     private readonly Dictionary<string, string?> _channelTopics = [];
     private string _currentChannel = string.Empty;
     private string _currentUser = string.Empty;
+    private int _lastChatWidth;
 
     /// <summary>
     /// Fired when the user selects a channel. Parameter is the channel name.
@@ -192,6 +193,9 @@ public sealed class MainWindow : Runnable
         // Apply our custom color schemes to all views
         ApplyColorSchemes();
 
+        // Re-wrap messages when the chat area is resized
+        _messageList.ViewportChanged += (_, _) => OnChatViewportChanged();
+
         // Window-level key handling for Ctrl+C (quit)
         KeyDown += OnWindowKeyDown;
     }
@@ -368,6 +372,16 @@ public sealed class MainWindow : Runnable
         }
     }
 
+    private void OnChatViewportChanged()
+    {
+        var newWidth = _messageList.Viewport.Width;
+        if (newWidth > 0 && newWidth != _lastChatWidth)
+        {
+            _lastChatWidth = newWidth;
+            RefreshMessages();
+        }
+    }
+
     private void OnWindowKeyDown(object? sender, Key e)
     {
         // Ctrl+C quits from anywhere
@@ -588,11 +602,22 @@ public sealed class MainWindow : Runnable
     {
         if (_channelMessages.TryGetValue(_currentChannel, out var messages))
         {
+            var width = _messageList.Viewport.Width;
             var source = new ChatListSource();
-            source.AddRange(messages);
+
+            if (width > 0)
+            {
+                foreach (var line in messages)
+                    source.AddRange(line.Wrap(width));
+            }
+            else
+            {
+                source.AddRange(messages);
+            }
+
             _messageList.Source = source;
-            if (messages.Count > 0)
-                _messageList.SelectedItem = messages.Count - 1;
+            if (source.Count > 0)
+                _messageList.SelectedItem = source.Count - 1;
         }
         else
         {

src/EchoHub.Client/UI/UserPanelDialog.cs

@@ -146,7 +146,8 @@ public sealed class UserPanelDialog
             Width = Dim.Fill(1),
             Height = 3,
             Text = bioText,
-            ReadOnly = true
+            ReadOnly = true,
+            WordWrap = true
         };
         bioView.SetScheme(new Scheme
         {