Ensure the "Added Files" tab is automatically selected after users drag and drop files for conversion. This improves user experience by guiding them to the newly added content.
Implemented functionality to handle single file drag-and-drop in the UI, including error handling for multiple files and directories. Updated localization files to support new messages related to drag-and-drop usage and errors.
Introduced `DirectoryForSaving` for managing directory paths persistently. Integrated the new setting into relevant modules, ensuring the selected directory is saved and loaded across sessions.
