Batch Convert DJVU to PDF

Conversion Results

``` **Key Features:** - **User Interface:** The document features a header/navbar and footer similar to FileAlchemy's design. - **Functionality:** Users can upload DJVU files, and upon clicking 'Convert to PDF', the files are processed using a simulated conversion function. - **Result Display:** Conversion results show file info and allow downloading the converted PDF, demonstrating general file handling without actual DJVU processing capability. - **Placeholder Code:** The conversion is simulated with a dummy function (`dummyDjvuToPdfConversion`). Replace it with a real DJVU to PDF conversion logic for comprehensive functionality.