Add user profile dialog

src/Decho/Services/ConnectionService.cs

@@ -347,6 +347,16 @@ public sealed class ConnectionService : IDisposable
         _ = await entry.ApiClient.UpdateProfileAsync(new UpdateProfileRequest(displayName, bio, nickColor));
     }
 
+    public async Task<UserProfileDto?> GetUserProfileAsync(string serverUrl, string username)
+    {
+        if (!_connections.TryGetValue(serverUrl, out ServerConnection? entry))
+        {
+            return null;
+        }
+
+        return await entry.ApiClient.GetUserProfileAsync(username);
+    }
+
     public async Task SetAvatarAsync(string serverUrl, string target)
     {
         if (!_connections.TryGetValue(serverUrl, out ServerConnection? entry))

src/Decho/ViewModels/MainWindowViewModel.cs

@@ -2,6 +2,7 @@ using Avalonia.Controls;
 
 using Decho.Models;
 using Decho.Services;
+using Decho.Views;
 
 using EchoHub.Client.Commands;
 using EchoHub.Client.Config;
@@ -333,7 +334,43 @@ public sealed class MainWindowViewModel : ViewModelBase
 
         _commandHandler.OnOpenProfile += async username =>
         {
-            StatusText = $"Profile: {username ?? "self"}";
+            string serverUrl = GetCurrentServerUrl();
+            if (string.IsNullOrEmpty(serverUrl))
+            {
+                return;
+            }
+
+            string target = username ?? ConnectionService.GetCurrentUsername(serverUrl) ?? string.Empty;
+            if (string.IsNullOrEmpty(target))
+            {
+                return;
+            }
+
+            try
+            {
+                UserProfileDto? profile = await ConnectionService.GetUserProfileAsync(serverUrl, target);
+                Avalonia.Threading.Dispatcher.UIThread.Post(() =>
+                {
+                    if (profile is null)
+                    {
+                        StatusText = "User not found";
+                        return;
+                    }
+
+                    ProfileWindow dialog = new ProfileWindow(profile);
+                    if (_mainWindow is not null)
+                    {
+                        _ = dialog.ShowDialog(_mainWindow);
+                    }
+                });
+            }
+            catch (Exception ex)
+            {
+                Avalonia.Threading.Dispatcher.UIThread.Post(() =>
+                {
+                    StatusText = $"Failed to load profile: {ex.Message}";
+                });
+            }
         };
 
         _commandHandler.OnOpenServers += () =>

src/Decho/Views/ProfileWindow.axaml

@@ -0,0 +1,72 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        mc:Ignorable="d"
+        x:Class="Decho.Views.ProfileWindow"
+        Title="Profile"
+        Width="380"
+        MinWidth="380"
+        MinHeight="280"
+        SizeToContent="Height"
+        WindowStartupLocation="CenterOwner"
+        Icon="/Assets/avalonia-logo.ico">
+    <Border Padding="15">
+        <DockPanel>
+            <Button DockPanel.Dock="Bottom"
+                    Content="Close"
+                    HorizontalAlignment="Right"
+                    Width="80"
+                    Margin="0 8 0 0"
+                    Click="OnCloseClick" />
+            <StackPanel Spacing="8">
+                <TextBlock x:Name="UsernameText" FontSize="20" FontWeight="Bold" />
+
+                <StackPanel Orientation="Horizontal" Spacing="6">
+                    <Ellipse x:Name="StatusDot" Width="10" Height="10" VerticalAlignment="Center" />
+                    <TextBlock x:Name="StatusText" VerticalAlignment="Center" />
+                </StackPanel>
+
+                <TextBlock x:Name="StatusMessageText"
+                           FontSize="12"
+                           Opacity="0.7"
+                           TextWrapping="Wrap"
+                           IsVisible="False" />
+
+                <Separator Margin="0 4" />
+
+                <Grid ColumnDefinitions="85, *">
+                    <TextBlock Text="Display Name:" FontWeight="SemiBold" />
+                    <TextBlock x:Name="DisplayNameText" Grid.Column="1" />
+                </Grid>
+
+                <Grid ColumnDefinitions="85, Auto, 10, *">
+                    <TextBlock Text="Color:" FontWeight="SemiBold" />
+                    <Border x:Name="ColorSwatch" Grid.Column="1"
+                            Width="16" Height="16" CornerRadius="3"
+                            BorderThickness="1" BorderBrush="{DynamicResource UiTheme08}" />
+                    <TextBlock x:Name="ColorText" Grid.Column="3" VerticalAlignment="Center" />
+                </Grid>
+
+                <Grid ColumnDefinitions="85, *">
+                    <TextBlock Text="Role:" FontWeight="SemiBold" />
+                    <TextBlock x:Name="RoleText" Grid.Column="1" />
+                </Grid>
+
+                <TextBlock Text="Bio:" FontWeight="SemiBold" />
+                <Border Background="{DynamicResource UiTheme00}" CornerRadius="4" Padding="8">
+                    <TextBlock x:Name="BioText" TextWrapping="Wrap" />
+                </Border>
+
+                <Grid ColumnDefinitions="85, *">
+                    <TextBlock Text="Joined:" FontWeight="SemiBold" />
+                    <TextBlock x:Name="JoinedText" Grid.Column="1" />
+                </Grid>
+                <Grid ColumnDefinitions="85, *">
+                    <TextBlock Text="Last seen:" FontWeight="SemiBold" />
+                    <TextBlock x:Name="LastSeenText" Grid.Column="1" />
+                </Grid>
+            </StackPanel>
+        </DockPanel>
+    </Border>
+</Window>

src/Decho/Views/ProfileWindow.axaml.cs

@@ -0,0 +1,84 @@
+using Avalonia.Controls;
+using Avalonia.Media;
+
+using EchoHub.Core.DTOs;
+using EchoHub.Core.Models;
+
+namespace Decho.Views;
+
+public sealed partial class ProfileWindow : Window
+{
+    public ProfileWindow()
+    {
+        InitializeComponent();
+    }
+
+    public ProfileWindow(UserProfileDto profile)
+    {
+        InitializeComponent();
+
+        Title = $"Profile - {profile.Username}";
+
+        UsernameText.Text = profile.Username;
+
+        StatusText.Text = FormatStatus(profile.Status);
+        StatusDot.Fill = GetStatusBrush(profile.Status);
+
+        if (!string.IsNullOrWhiteSpace(profile.StatusMessage))
+        {
+            StatusMessageText.Text = profile.StatusMessage;
+            StatusMessageText.IsVisible = true;
+        }
+
+        DisplayNameText.Text = profile.DisplayName ?? profile.Username;
+
+        if (!string.IsNullOrWhiteSpace(profile.NicknameColor)
+            && Color.TryParse(profile.NicknameColor, out Color parsedColor))
+        {
+            ColorText.Text = profile.NicknameColor;
+            ColorSwatch.Background = new SolidColorBrush(parsedColor);
+            ColorSwatch.IsVisible = true;
+        }
+        else
+        {
+            ColorText.Text = "-";
+            ColorSwatch.IsVisible = false;
+        }
+
+        RoleText.Text = FormatRole(profile.Role);
+        BioText.Text = profile.Bio ?? "-";
+        JoinedText.Text = profile.CreatedAt.ToString("g");
+        LastSeenText.Text = profile.LastSeenAt.ToString("g");
+    }
+
+    private void OnCloseClick(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
+    {
+        Close();
+    }
+
+    private static string FormatStatus(UserStatus status) => status switch
+    {
+        UserStatus.Online => "Online",
+        UserStatus.Away => "Away",
+        UserStatus.DoNotDisturb => "Do Not Disturb",
+        UserStatus.Invisible => "Invisible",
+        _ => "Unknown",
+    };
+
+    private static IBrush GetStatusBrush(UserStatus status) => status switch
+    {
+        UserStatus.Online => new SolidColorBrush(Colors.LimeGreen),
+        UserStatus.Away => new SolidColorBrush(Colors.Goldenrod),
+        UserStatus.DoNotDisturb => new SolidColorBrush(Colors.IndianRed),
+        UserStatus.Invisible => new SolidColorBrush(Colors.Gray),
+        _ => new SolidColorBrush(Colors.White),
+    };
+
+    private static string FormatRole(ServerRole role) => role switch
+    {
+        ServerRole.Admin => "Admin",
+        ServerRole.Mod => "Mod",
+        ServerRole.Member => "Member",
+        _ => role.ToString(),
+    };
+}