Multi-File Processing Support

New Features

1. Multiple File Selection

   • Users can now select multiple files simultaneously
   • First selected file is displayed in the UI for reference

2. Simplified Output Handling

   • Single output directory selection for all files
   • Automatic file naming with "_injected" suffix

3. Batch Processing

   • Sequential processing of all selected files
   • Robust error handling: individual failures don't stop the batch
   • Progress tracking with status messages