feat: add Content-Disposition header for file downloads in download_scale_results

- Enhanced the download_scale_results function to include a Content-Disposition header, specifying the filename for the "psychoscales.db" file download. This improves the user experience by prompting the correct file name during downloads.

app.py

@@ -273,6 +273,7 @@ async def download_scale_results(scale_id: str, db: Session = Depends(get_db)):
             return FileResponse(
                 "psychoscales.db",
                 headers={
+                    "Content-Disposition": f'attachment; filename="psychoscales.db"',
                     "Cache-Control": "no-store, no-cache, must-revalidate, max-age=0",
                     "Pragma": "no-cache",
                     "Expires": "0"