- Fixed JS references to removed deletePages/rotatePages/reorderPages inputs
- Execute function now reads from visual page grid selections
- Fixed reorder URL (/pdf/reorder instead of /pdf/rotate)
- Preview API confirmed working (200, image/png)
- Replace text inputs with visual page grid (thumbnails)
- Click to select pages for delete/rotate
- Drag to reorder pages (visual)
- Thumbnails loaded lazily from /pdf/preview/:id/:page
- Selected pages highlighted with blue border + checkmark
- Grid auto-fills, max-height with scroll
- GET /pdf/preview/:fileId — renders first page as PNG (72 DPI)
- GET /pdf/preview/:fileId/:page — specific page preview
- GET /pdf/thumbnails/:fileId — list of all page preview URLs
- File cards show actual PDF thumbnail instead of icon
- Cached previews (30 min cleanup)
- Fallback to PDF icon if preview fails
- 15 API endpoints for PDF operations (pdf-lib, pdf-parse, Ghostscript)
- Frontend with 8 operation tabs
- Merge multiple PDFs, split by page ranges
- Rotate/delete/reorder pages
- Add watermark text, page numbers
- Compress via Ghostscript (screen/ebook/printer quality)
- PDF to PNG/JPG, Images to PDF
- Password protection, text extraction
- Added to sidebar, dashboard (Utils category), DB
