feat: Add drag-and-drop support for folders

[adafdg]

This commit introduces drag-and-drop functionality to the main window.

Users can now drag a single folder from the file explorer onto the application window to select it for compression. This improves the user experience by providing a quicker alternative to the "Select Folder" button.

Changes include:

• Enabling drop events on MainWindow.xaml.
• Adding DragEnter and Drop event handlers in MainWindow.xaml.vb to validate and process the dropped folder.
• Adding a FolderPath write-only property to HomeViewModel.vb to integrate with the existing folder processing logic.

[adafdg]

This commit introduces two new major features to improve usability and safety:

1. Drag-and-Drop Support:

   • Users can now drag a single folder from the file explorer onto the main application window.
   • This action automatically initiates the folder analysis, providing a more intuitive and faster workflow compared to using the file selection dialog.

2. DirectStorage Game Detection:

   • The application now scans for dstorage.dll and dstoragecore.dll during folder analysis.
   • If these files are detected, a prominent warning is displayed in the UI, and the compression controls are disabled for that folder.
   • This prevents users from compressing games that use DirectStorage, which could lead to performance degradation or prevent the game from launching.