WeKan Office Open XML viewer fork

This directory vendors the browser runtime from @silurus/ooxml 0.85.2 for WeKan's read-only DOCX, XLSX and PPTX attachment previews. Its upstream source is https://github.com/yukiyokotani/office-open-xml-viewer at release v0.85.2 (commit 9756f5e). The source npm tarball SHA256 is 7dd3995b65e45adfab9d7686e1a2eb69d4c5a9851cbd025e63aaf97869110831.

Only the three browser viewer entry graphs, their WebAssembly parsers and their render workers are retained. The upstream Node API, MCP server, VS Code extension, examples, site, source toolchain, type declarations and optional MathJax, ChartEx, region-map and TIFF entry points are excluded. This package has no npm dependencies or lifecycle scripts.

The compiled runtime remains upstream's MIT-licensed code. LICENSE and THIRD_PARTY_NOTICES.md are retained verbatim. Update this fork only from a reviewed, pinned upstream release and repeat the attachment security tests.