fix: Add page image injection in Layout+VLM pipeline

[cau-git]

Checklist:

• [ ] Documentation has been updated, if necessary.
• [ ] Examples have been added, if necessary.
• [ ] Tests have been added, if necessary.

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Related Documentation

Checked 4 published document(s) in 1 knowledge base(s). No updates required.

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Codecov Report

:x: Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...erimental/pipeline/threaded_layout_vlm_pipeline.py	0.00%	14 Missing :warning:

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[cau-git]

This PR will be superseded by another one, since it introduced unnecessary code duplication for this purpose.