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/ViewModels/AiSettingsViewModel.cs

@@ -115,6 +115,105 @@ public class AiSettingsViewModel : ViewModelBase
         }
     }
 
+    private string _faceUploadPath = string.Empty;
+    public string FaceUploadPath
+    {
+        get => _faceUploadPath;
+        set
+        {
+            _faceUploadPath = value;
+            NotifyPropertyChanged();
+        }
+    }
+
+    private bool _faceUploadDryRun;
+    public bool FaceUploadDryRun
+    {
+        get => _faceUploadDryRun;
+        set
+        {
+            _faceUploadDryRun = value;
+            NotifyPropertyChanged();
+        }
+    }
+
+    private string _faceSshUsername = string.Empty;
+    public string FaceSshUsername
+    {
+        get => _faceSshUsername;
+        set
+        {
+            _faceSshUsername = value;
+            NotifyPropertyChanged();
+        }
+    }
+
+    private string _faceSshPassword = string.Empty;
+    public string FaceSshPassword
+    {
+        get => _faceSshPassword;
+        set
+        {
+            _faceSshPassword = value;
+            NotifyPropertyChanged();
+        }
+    }
+
+    private string _faceSshAddress = string.Empty;
+    public string FaceSshAddress
+    {
+        get => _faceSshAddress;
+        set
+        {
+            _faceSshAddress = value;
+            NotifyPropertyChanged();
+        }
+    }
+
+    private string _faceSshPort = "22";
+    public string FaceSshPort
+    {
+        get => _faceSshPort;
+        set
+        {
+            _faceSshPort = value;
+            NotifyPropertyChanged();
+        }
+    }
+
+    private string _faceSshPathA = string.Empty;
+    public string FaceSshPathA
+    {
+        get => _faceSshPathA;
+        set
+        {
+            _faceSshPathA = value;
+            NotifyPropertyChanged();
+        }
+    }
+
+    private string _faceSshPathB = string.Empty;
+    public string FaceSshPathB
+    {
+        get => _faceSshPathB;
+        set
+        {
+            _faceSshPathB = value;
+            NotifyPropertyChanged();
+        }
+    }
+
+    private bool _isFaceUploadRunning;
+    public bool IsFaceUploadRunning
+    {
+        get => _isFaceUploadRunning;
+        set
+        {
+            _isFaceUploadRunning = value;
+            NotifyPropertyChanged();
+        }
+    }
+
     private bool _faceRecursive;
     public bool FaceRecursive
     {