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* Chore: Generate PDF thumbnails with pdftoppm and Pillow instead of ImageMagick Replace the ImageMagick convert based PDF thumbnail path with pdftoppm and Pillow. Keeps thumbnails at 500px wide for small and odd sized pages, covers the qpdf repair and double failure paths, removes the unused run_convert helper, hardens thumbnail encoding, deprecates PAPERLESS_CONVERT_MEMORY_LIMIT and PAPERLESS_CONVERT_TMPDIR, and corrects the related docs and CI. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> * Chore: Supersample the PDF thumbnail render 2x Render the PDF page at twice the target size and downsample, with edge case handling for small and odd sized pages, simplified helpers and tests, and trimmed comments. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> * Fix: use a fractional thumbnail DPI so oversized pages render a bounded raster * Deprecate the unused PAPERLESS_GS_BINARY setting too * Warn at startup when pdftoppm is missing * Resample PDF thumbnails once instead of twice with LANCZOS, still never enlarging * Read PDF page size from pdfinfo so it matches pdftoppm * Mark the thumbnail constants Final * Comment each pdftoppm option