FixedDownload
Fixed 404 errors when downloading key plans and area-plan PDFs
Downloading key plans, 2D plans, or area-plan PDFs from BIMIT AI outputs could return a 404 error, even though the same images displayed fine as thumbnails.
The download and full-fetch paths now sign these files correctly before handing them to your browser, matching what the thumbnail view already did. Key plans, 2D pipeline images, and area-plan PDFs now download and preview as expected.