Enable author profile dialog on author name click in message view

src/Decho/Views/MessageItemView.axaml

@@ -15,7 +15,9 @@
 				<TextBlock VerticalAlignment="Top"
 						   Text="{Binding AuthorName}"
 						   FontWeight="Bold"
-						   Foreground="{Binding AuthorColor}" />
+						   Foreground="{Binding AuthorColor}"
+						   Cursor="Hand"
+						   PointerPressed="OnAuthorNamePointerPressed" />
 				<TextBlock VerticalAlignment="Top"
 						   Text="{Binding TimeText}"
 						   FontSize="10"

src/Decho/Views/MessageItemView.axaml.cs

@@ -5,6 +5,8 @@ using Avalonia.Platform.Storage;
 
 using Decho.ViewModels;
 
+using EchoHub.Core.DTOs;
+
 namespace Decho.Views;
 
 public partial class MessageItemView : UserControl
@@ -69,6 +71,35 @@ public partial class MessageItemView : UserControl
         }
     }
 
+    private async void OnAuthorNamePointerPressed(object? sender, Avalonia.Input.PointerPressedEventArgs e)
+    {
+        if (DataContext is not MessageViewModel msg)
+        {
+            return;
+        }
+
+        TopLevel? topLevel = TopLevel.GetTopLevel(this);
+        if (topLevel?.DataContext is not MainWindowViewModel mainVm)
+        {
+            return;
+        }
+
+        string serverUrl = msg.ServerUrl ?? mainVm.Chat.CurrentServerUrl;
+        string username = msg.Model.Author.Id;
+        UserProfileDto? profile = await mainVm.ConnectionService.GetUserProfileAsync(serverUrl, username);
+        if (profile is null)
+        {
+            return;
+        }
+
+        ProfileWindow dialog = new ProfileWindow(profile);
+
+        if (topLevel is Window parent)
+        {
+            await dialog.ShowDialog(parent);
+        }
+    }
+
     private async void OnDownloadClicked(object? sender, RoutedEventArgs e)
     {
         if (DataContext is not MessageViewModel msg)