feat: enhance file upload and URL sending with optional size parameter

src/EchoHub.Client/AppOrchestrator.cs

@@ -117,7 +117,7 @@ public sealed class AppOrchestrator : IDisposable
             return Task.CompletedTask;
         };
 
-        _commandHandler.OnSendFile += async (target) =>
+        _commandHandler.OnSendFile += async (target, size) =>
         {
             if (!IsAuthenticated || !IsConnected) return;
 
@@ -129,13 +129,13 @@ public sealed class AppOrchestrator : IDisposable
                 if (Uri.TryCreate(target, UriKind.Absolute, out var uri)
                     && (uri.Scheme == "http" || uri.Scheme == "https"))
                 {
-                    await _apiClient!.SendUrlAsync(channel, target);
+                    await _apiClient!.SendUrlAsync(channel, target, size);
                 }
                 else
                 {
                     await using var stream = File.OpenRead(target);
                     var fileName = Path.GetFileName(target);
-                    await _apiClient!.UploadFileAsync(channel, stream, fileName);
+                    await _apiClient!.UploadFileAsync(channel, stream, fileName, size);
                 }
             }
             catch (Exception ex)

src/EchoHub.Client/Commands/CommandHandler.cs

@@ -10,7 +10,7 @@ public class CommandHandler
     public event Func<string, Task>? OnSetNick;
     public event Func<string, Task>? OnSetColor;
     public event Func<string, Task>? OnSetTheme;
-    public event Func<string, Task>? OnSendFile;
+    public event Func<string, string?, Task>? OnSendFile;
     public event Func<string?, Task>? OnOpenProfile;
     public event Func<Task>? OnOpenServers;
     public event Func<string, Task>? OnJoinChannel;
@@ -134,15 +134,31 @@ public class CommandHandler
     private async Task<CommandResult> HandleSend(string args)
     {
         if (string.IsNullOrWhiteSpace(args))
-            return new CommandResult(true, "Usage: /send <filepath or URL>", IsError: true);
+            return new CommandResult(true, "Usage: /send <filepath or URL> [-s|-m|-l]", IsError: true);
 
-        var target = args.Trim().Trim('"');
+        // Parse optional size flag (-s, -m, -l)
+        string? size = null;
+        var parts = args.Split(' ', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+        var targetParts = new List<string>();
+
+        foreach (var part in parts)
+        {
+            if (part is "-s" or "-m" or "-l")
+                size = part[1..]; // "s", "m", or "l"
+            else
+                targetParts.Add(part);
+        }
+
+        var target = string.Join(' ', targetParts).Trim('"');
+
+        if (string.IsNullOrWhiteSpace(target))
+            return new CommandResult(true, "Usage: /send <filepath or URL> [-s|-m|-l]", IsError: true);
 
         if (Uri.TryCreate(target, UriKind.Absolute, out var uri)
             && (uri.Scheme == "http" || uri.Scheme == "https"))
         {
             if (OnSendFile is not null)
-                await OnSendFile(target);
+                await OnSendFile(target, size);
             var fileName = Path.GetFileName(uri.LocalPath);
             if (string.IsNullOrWhiteSpace(fileName))
                 fileName = "image";
@@ -153,7 +169,7 @@ public class CommandHandler
             return new CommandResult(true, $"File not found: {target}", IsError: true);
 
         if (OnSendFile is not null)
-            await OnSendFile(target);
+            await OnSendFile(target, size);
         return new CommandResult(true, $"Uploading: {Path.GetFileName(target)}...");
     }
 
@@ -326,7 +342,7 @@ public class CommandHandler
               /nick <name>                         - Set display name
               /color <#hex>                        - Set nickname color
               /theme <name>                        - Switch theme
-              /send <filepath or URL>               - Send a file or image
+              /send <filepath or URL> [-s|-m|-l]      - Send a file or image (size: small/medium/large)
               /avatar <URL or filepath>             - Set your avatar
               /profile [username]                   - View a profile
               /servers                             - Open saved servers

src/EchoHub.Client/Services/ApiClient.cs

@@ -160,7 +160,7 @@ public sealed class ApiClient : IDisposable
         return result?.AvatarAscii;
     }
 
-    public async Task<MessageDto?> UploadFileAsync(string channelName, Stream fileStream, string fileName)
+    public async Task<MessageDto?> UploadFileAsync(string channelName, Stream fileStream, string fileName, string? size = null)
     {
         EnsureAuthenticated();
         using var content = new MultipartFormDataContent();
@@ -168,18 +168,20 @@ public sealed class ApiClient : IDisposable
         streamContent.Headers.ContentType = new MediaTypeHeaderValue(GetContentType(fileName));
         content.Add(streamContent, "file", fileName);
 
+        var sizeQuery = size is not null ? $"?size={size}" : "";
         var response = await AuthenticatedRequestAsync(() =>
-            _http.PostAsync($"/api/channels/{Uri.EscapeDataString(channelName)}/upload", content));
+            _http.PostAsync($"/api/channels/{Uri.EscapeDataString(channelName)}/upload{sizeQuery}", content));
         await EnsureSuccessAsync(response);
         return await response.Content.ReadFromJsonAsync<MessageDto>();
     }
 
-    public async Task<MessageDto?> SendUrlAsync(string channelName, string url)
+    public async Task<MessageDto?> SendUrlAsync(string channelName, string url, string? size = null)
     {
         EnsureAuthenticated();
         var request = new SendUrlRequest(url);
+        var sizeQuery = size is not null ? $"?size={size}" : "";
         var response = await AuthenticatedRequestAsync(() =>
-            _http.PostAsJsonAsync($"/api/channels/{Uri.EscapeDataString(channelName)}/send-url", request));
+            _http.PostAsJsonAsync($"/api/channels/{Uri.EscapeDataString(channelName)}/send-url{sizeQuery}", request));
         await EnsureSuccessAsync(response);
         return await response.Content.ReadFromJsonAsync<MessageDto>();
     }

src/EchoHub.Client/UI/ChatRenderer.cs

@@ -214,7 +214,8 @@ public class ChatListSource : IListDataSource
         listView.Move(Math.Max(col - viewportX, 0), row);
 
         var chatLine = _lines[item];
-        var normalAttr = listView.GetAttributeForRole(selected ? VisualRole.Focus : VisualRole.Normal);
+        // Always use Normal — chat messages should not show focus/selection highlight
+        var normalAttr = listView.GetAttributeForRole(VisualRole.Normal);
         var mentionBg = chatLine.IsMention ? ChatColors.MentionHighlightAttr.Background : (Color?)null;
 
         int charPos = 0;
@@ -368,6 +369,85 @@ public class ChannelListSource : IListDataSource
     public void Dispose() { }
 }
 
+/// <summary>
+/// Custom list data source for the online users panel with per-user nickname colors.
+/// </summary>
+public class UserListSource : IListDataSource
+{
+    private readonly List<(string Text, Attribute? NameColor)> _users = [];
+
+    public event NotifyCollectionChangedEventHandler? CollectionChanged;
+    public int Count => _users.Count;
+    public int MaxItemLength { get; private set; }
+    public bool SuspendCollectionChangedEvent { get; set; }
+
+    public void Update(List<(string Text, Attribute? NameColor)> users)
+    {
+        _users.Clear();
+        _users.AddRange(users);
+        MaxItemLength = users.Count > 0 ? users.Max(u => u.Text.Length) : 0;
+        if (!SuspendCollectionChangedEvent)
+            CollectionChanged?.Invoke(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
+    }
+
+    public bool IsMarked(int item) => false;
+    public void SetMark(int item, bool value) { }
+    public IList ToList() => _users.Select(u => u.Text).ToList();
+
+    public void Render(ListView listView, bool selected, int item, int col, int row, int width, int viewportX = 0)
+    {
+        listView.Move(Math.Max(col - viewportX, 0), row);
+
+        var (text, nameColor) = _users[item];
+        var normalAttr = listView.GetAttributeForRole(selected ? VisualRole.Focus : VisualRole.Normal);
+
+        // Find where the name starts (after status icon + space + optional role badge)
+        // Format: "● ★Username" or "● Username"
+        int nameStart = 0;
+        int i = 0;
+        // Skip status icon
+        while (i < text.Length && !char.IsLetterOrDigit(text[i]) && text[i] != '_') i++;
+        nameStart = i;
+
+        int drawnChars = 0;
+
+        // Draw prefix (status icon + role badge) in normal color
+        var prefixAttr = normalAttr;
+        for (int c = 0; c < nameStart && c < text.Length; c++)
+        {
+            if (drawnChars < width)
+            {
+                listView.SetAttribute(prefixAttr);
+                listView.AddRune(new Rune(text[c]));
+                drawnChars++;
+            }
+        }
+
+        // Draw name in nickname color
+        var userAttr = nameColor ?? normalAttr;
+        if (selected) userAttr = normalAttr; // use focus attr when selected
+        for (int c = nameStart; c < text.Length; c++)
+        {
+            if (drawnChars < width)
+            {
+                listView.SetAttribute(userAttr);
+                listView.AddRune(new Rune(text[c]));
+                drawnChars++;
+            }
+        }
+
+        // Fill rest
+        listView.SetAttribute(normalAttr);
+        while (drawnChars < width)
+        {
+            listView.AddRune(new Rune(' '));
+            drawnChars++;
+        }
+    }
+
+    public void Dispose() { }
+}
+
 /// <summary>
 /// Shared color attributes for chat rendering (timestamps, system messages).
 /// </summary>

src/EchoHub.Client/UI/MainWindow.cs

@@ -1,4 +1,3 @@
-using System.Collections.ObjectModel;
 using System.Text.RegularExpressions;
 using EchoHub.Client.Themes;
 using EchoHub.Core.DTOs;
@@ -30,6 +29,7 @@ public sealed class MainWindow : Runnable
     // Online users panel
     private readonly FrameView _usersFrame;
     private readonly ListView _usersList;
+    private readonly UserListSource _usersListSource;
     private bool _usersPanelVisible = true;
     private const int UsersPanelWidth = 22;
     private static readonly Key F2Key = Key.F2;
@@ -215,7 +215,8 @@ public sealed class MainWindow : Runnable
             Width = Dim.Fill(),
             Height = Dim.Fill()
         };
-        _usersList.SetSource(new ObservableCollection<string>());
+        _usersListSource = new UserListSource();
+        _usersList.Source = _usersListSource;
         _usersFrame.Add(_usersList);
         Add(_usersFrame);
 
@@ -679,7 +680,8 @@ public sealed class MainWindow : Runnable
         _chatFrame.Title = "Chat";
         _topicLabel.Visible = false;
         _chatFrame.Y = 1;
-        _usersList.SetSource(new ObservableCollection<string>());
+        _usersListSource.Update([]);
+        _usersList.Source = _usersListSource;
         _usersFrame.Title = "Users";
         RefreshMessages();
     }
@@ -805,10 +807,13 @@ public sealed class MainWindow : Runnable
                 ServerRole.Mod => "\u2740",   // ❀
                 _ => ""
             };
-            return $"{statusIcon} {roleTag}{name}";
+            var text = $"{statusIcon} {roleTag}{name}";
+            var nameColor = ColorHelper.ParseHexColor(u.NicknameColor);
+            return (text, nameColor);
         }).ToList();
 
-        _usersList.SetSource(new ObservableCollection<string>(displayItems));
+        _usersListSource.Update(displayItems);
+        _usersList.Source = _usersListSource;
         _usersFrame.Title = $"Users ({users.Count})";
     }