gigapdf-lib v0.66.0

Added

• HTML/CSS rendering — LibreOffice-level fidelity. htmlRender gains real CSS
  grid (fr/minmax/repeat/span/auto-rows) and complete flexbox
  (basis/grow/shrink/wrap/justify/align), multi-column (column-count/columns/
  column-gap), pragmatic RTL/bidi (direction/dir, RTL block/inline/run
  layout), table fidelity (colspan/rowspan, LibreOffice-level), text styling
  (super/sub, underline, strike), @media, font shorthand and further CSS-2 coverage.
• Document reconstruction (structuredText) — waves R1–R10. Typed + populated
  pageBlocks bodies, merged-cell spans, strikethrough, hyperlinks, paragraph
  spacing, super/subscript, document outline + figure captions, list nesting +
  continuation lines, multi-column reading order, multiple tables per page
  (connected-component split), borderless right/decimal-aligned columns, true
  decimal-tab alignment.
• PDF permissions — 8 functional flags. getPermissions + correct /P encoding
  of the 8 standard permission bits (print, modify, copy, annotate, fill-forms,
  extract, assemble, high-res print).
• Model structural edits. Table & sheet structural-edit ModelOps.

OCR (native gigapdf-ocr-rten crate — host-side, not bundled in the npm package)

• Pivoted the OCR engine to PaddleOCR PP-OCR on RTen (pure-Rust ONNX, no C++/
  Tesseract): 13 printed languages incl. our own Hebrew model, with automatic
  per-line script selection.
• Handwriting recognizer (latin_hw) — our own CRNN trained on real handwriting
  (IAM/RIMES/NorHand/…; standard nn.LSTM → dynamic-width ONNX), opt-in via
  recognize_page_handwriting / recognize_page_with(img, "latin_hw").
• Full OCR documentation refresh (architecture, training data, SDK, cookbook).