feat(legal): bundle small dependencies, add notices, credits, and GPL source offers

Bundle (v4.7.0):
- MarkItDown frozen to a single ~75MB per-platform binary (PyInstaller via
  npm run bundle:markitdown; ML extras excluded) — built and verified
  locally: HTML/XLSX/PDF conversions pass through the bundled binary, and
  the app resolves bin/linux/markitdown first at runtime
- Packaging copies bundled markitdown alongside Pandoc for win/mac/linux;
  FFmpeg/sharp/KaTeX/fonts were already bundled

Legal artifacts:
- THIRD-PARTY-NOTICES.md: complete license inventory of everything
  distributed (binaries, npm runtime deps, fonts, embedded Python packages)
- SOURCES.md: GPL §3(b) written source offers for Pandoc 3.9.0.2,
  ffmpeg-static's GPL build, and the PyInstaller bootloader; LGPL relinking
  note for libvips
- third-party-licenses/: canonical GPL-2.0, LGPL-2.1, MPL-2.0, Apache-2.0,
  OFL-1.1, PSF-Python texts
- Help > Third-Party Notices & Licenses: in-app viewer for both documents
- README: 'Bundled Dependencies, Legal Notices & Credits' section

Hardening:
- download-tools.js now SHA-256 pins every artifact, verifies after
  download AND against the cache on every run, and hard-fails on mismatch
  (closes security finding D6)

Large tools intentionally not bundled (documented): LibreOffice,
MiKTeX/TeX Live, ImageMagick, PlantUML+JRE, Calibre.

637/637 tests green; lint clean; clean boot; bundled binary verified.
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# PanConverter - Updates & Changelog
## Version 4.7.0 (2026-09-05)
### Bundling & Legal Compliance
- **MarkItDown is now bundled**: `npm run bundle:markitdown` freezes Microsoft's
markitdown (MIT) + embedded Python runtime into a single ~75MB per-platform
binary (`bin/<platform>/markitdown`) via PyInstaller (ML extras excluded);
the app prefers the bundled binary and falls back to system installs
- Packaging copies the bundled markitdown for Windows/macOS/Linux alongside Pandoc
- **THIRD-PARTY-NOTICES.md** — full license inventory of everything distributed
(bundled binaries, npm runtime deps, fonts, embedded Python packages)
- **SOURCES.md** — GPL §3(b) written source offer for Pandoc / FFmpeg (GPL build) /
PyInstaller bootloader, with pinned versions + SHA-256; LGPL relinking note for libvips
- **third-party-licenses/** — canonical texts: GPL-2.0, LGPL-2.1, MPL-2.0,
Apache-2.0, OFL-1.1, PSF-Python
- **Help → Third-Party Notices & Licenses** — in-app viewer for both documents
- **download-tools.js** now SHA-256 pins and verifies every downloaded artifact
(post-download and against the cache on every run; hard-fails on mismatch)
- README gains a "Bundled Dependencies, Legal Notices & Credits" section
- Large optional tools intentionally NOT bundled (documented): LibreOffice,
MiKTeX/TeX Live, ImageMagick, PlantUML+JRE, Calibre
---
## Version 4.6.1 (2026-09-05)
### New Features