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build(deps): bump unpdf from 1.9.1 to 2.1.0 (#310)

* build(deps): bump unpdf from 1.9.1 to 2.1.0

Bumps [unpdf](https://github.com/unjs/unpdf) from 1.9.1 to 2.1.0.
- [Release notes](https://github.com/unjs/unpdf/releases)
- [Commits](https://github.com/unjs/unpdf/compare/v1.9.1...v2.1.0)

---
updated-dependencies:
- dependency-name: unpdf
  dependency-version: 2.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* fix(pdf): read the RGBA images unpdf 2 extracts

unpdf 2 dropped the `channels` field from `extractImages` and always
returns RGBA pixels, so `usable()` filtered every image out and every
PDF lost its `image` and `logo`. Encode RGBA and stop reading `channels`.

unpdf 2 also returns image masks, which have no color of their own and
come out opaque black on transparent. Reject those stencils by their
pixels, so a PDF keeps the logo it had on unpdf 1.

Checked against the 53 PDF fixtures: the 46 images unpdf 1.9.1 extracted
are byte-identical in RGBA on 2.1.0, and every chosen image and logo is
the same one. Snapshot diffs are the PNG length only (RGB -> RGBA).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(pdf): compare every scanline of the extracted image

A PNG stride that only covers RGB pixels kept the first pixel right
and passed, unseen without the PDF fixtures.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix: declare Node.js 24 as the minimum version

unpdf 2 declares engines `node >=24`, which is now the highest floor in
the dependency tree (was @metascraper/helpers at >= 22.13).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(pdf): name each color channel the stencil check reads

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* refactor(pdf): keep the alpha constants with the others

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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