Empty the hardcoded page-range default in remove/split/extract PDF tools (remove-pages defaulted to "2,4-6", out of range for any PDF under 6 pages) and disable submit until a range is entered. Reject password-protected PDFs up front for PDF-only tools with guidance to unlock first, instead of failing cryptically in the qpdf worker. Adds integration + e2e coverage.
Draw, type, or upload a signature and place resizable/rotatable copies across PDF pages; output flattened server-side with PyMuPDF. Visual electronic signature, not cryptographic. New interactive-sign display mode (pdf.js + Konva) and a custom docs-pool route.
