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

@@ -88,7 +88,7 @@
                     <views:FaceAiTabView />
                 </TabItem>
 
-                <TabItem>
+                <TabItem IsVisible="False">
                     <TabItem.Header>
                         <StackPanel Orientation="Horizontal">
                             <iconPacks:PackIconMaterial Kind="CloudUploadOutline" Width="14" Height="14" Margin="0,0,4,0" Foreground="{DynamicResource ForegroundBrush}" />