Refactor path handling in UI components

- Removed redundant folder and file opening methods from AiTabView and FaceAiTabView.
- Introduced PathPickerField control to streamline path selection and opening functionality across multiple views.
- Updated FaceAiTabView and GeneralTabView to utilize PathPickerField for source and destination path selection.
- Created PathShellService to encapsulate logic for opening paths in the file explorer.
- Simplified XAML structure by replacing manual grid definitions with PathPickerField components.
- Removed unused namespaces and cleaned up code for better readability and maintainability.

imagecatalog/Services/PathShellService.cs

@@ -0,0 +1,50 @@
+using System.Diagnostics;
+using System.IO;
+
+namespace ImageCatalog_2.Services;
+
+public static class PathShellService
+{
+    public static void OpenInExplorer(string? path)
+    {
+        if (string.IsNullOrWhiteSpace(path))
+        {
+            return;
+        }
+
+        var normalizedPath = path.Trim().Trim('"');
+
+        try
+        {
+            if (File.Exists(normalizedPath))
+            {
+                Process.Start("explorer.exe", $"/select,\"{normalizedPath}\"");
+                return;
+            }
+
+            if (Directory.Exists(normalizedPath))
+            {
+                Process.Start(new ProcessStartInfo
+                {
+                    FileName = normalizedPath,
+                    UseShellExecute = true
+                });
+                return;
+            }
+
+            var containingDirectory = Path.GetDirectoryName(normalizedPath);
+            if (!string.IsNullOrWhiteSpace(containingDirectory) && Directory.Exists(containingDirectory))
+            {
+                Process.Start(new ProcessStartInfo
+                {
+                    FileName = containingDirectory,
+                    UseShellExecute = true
+                });
+            }
+        }
+        catch
+        {
+            // Ignore failures when opening Explorer.
+        }
+    }
+}