Refactor application to remove Windows Forms dependencies and transition to Avalonia UI

- Deleted MainWindow.xaml.cs, which contained the WPF implementation of the main window.
- Updated Program.cs to remove Windows Forms initialization and support only Avalonia UI.
- Removed Windows Forms specific code from ViewModelBase, including control marshalling logic.

.vscode/launch.json

@@ -0,0 +1,16 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "ImageCatalog Avalonia",
+      "type": "coreclr",
+      "request": "launch",
+      "preLaunchTask": "build ImageCatalog Avalonia",
+      "program": "${workspaceFolder:Catalog}/imagecatalog/bin/Debug/net10.0-windows/win-x64/ImageCatalog.exe",
+      "args": [],
+      "cwd": "${workspaceFolder:Catalog}/imagecatalog",
+      "stopAtEntry": false,
+      "console": "internalConsole"
+    }
+  ]
+}