Replace browser-side pdfjs-dist canvas rendering with server-side
MuPDF rendering for high-quality PDF booklet display. MuPDF renders
pages to PNG at configurable DPI in Rust, producing much sharper
results than the JavaScript canvas approach which had persistent
JPEG 2000 WASM decoder issues.
- Add mupdf crate with sys-lib features (avoid GTK symbol conflicts)
- Create pdf_viewer.rs with v2_booklet_open/render_page/close commands
- Download PDF to temp file, render pages on demand via MuPDF
- Display rendered PNGs as img tags instead of canvas
- DPI scales with zoom and devicePixelRatio for crisp output
- Support rotation via MuPDF transformation matrix
vicrodh
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