feat: Enhance Face AI upload functionality and UI

- Updated MainWindow.axaml to increase height and add new UI elements for SSH upload configuration.
- Implemented commands for opening source and destination paths in file explorer.
- Added FaceUploadPath and SSH configuration properties to DataModel and AiSettingsViewModel.
- Introduced validation for FaceUploadPath format and commands for uploading face encoder output.
- Enhanced PickerPreferenceService to manage SSH credentials and upload preferences.
- Updated settings persistence to include FaceUploadPath and SSH preferences.
- Added tests for FaceUploadPath validation and upload command enabling logic.

imagecatalog/AvaloniaMainWindow.axaml.cs

@@ -273,10 +273,11 @@ public partial class AvaloniaMainWindow : Window
         var dialog = new Window
         {
             Title = title,
-            Width = 480,
+            Width = 960,
+            Height = 560,
             CanResize = false,
             WindowStartupLocation = WindowStartupLocation.CenterOwner,
-            SizeToContent = SizeToContent.Height
+            SizeToContent = SizeToContent.Manual
         };
 
         dialog.Content = BuildMessageDialogContent(message, () => dialog.Close());
@@ -311,11 +312,17 @@ public partial class AvaloniaMainWindow : Window
             Spacing = 12
         };
 
-        layout.Children.Add(new TextBlock
+        layout.Children.Add(new ScrollViewer
         {
-            Text = message,
-            TextWrapping = Avalonia.Media.TextWrapping.Wrap,
-            MaxWidth = 420
+            Height = 460,
+            HorizontalScrollBarVisibility = Avalonia.Controls.Primitives.ScrollBarVisibility.Auto,
+            VerticalScrollBarVisibility = Avalonia.Controls.Primitives.ScrollBarVisibility.Auto,
+            Content = new TextBlock
+            {
+                Text = message,
+                TextWrapping = Avalonia.Media.TextWrapping.Wrap,
+                FontFamily = new Avalonia.Media.FontFamily("Cascadia Mono, Consolas, monospace")
+            }
         });
 
         var closeButton = new Button