chore: Condensing the latex test backend into multiple files

[adityasasidhar]

Description

Resolves #3235

This PR improves the maintainability and scalability of the LaTeX testing suite by modularizing the massive tests/test_backend_latex.py file (which had grown to over 1,800 lines).

The monolithic test file has been removed and its contents systematically distributed into a dedicated tests/test_latex/ subdirectory based on the features being tested, without removing or altering the logic of any existing test logic.

Changes Made:

• Removed tests/test_backend_latex.py.

• Created feature-specific test modules:

  • test_basic.py (e2e, conversions, arguments, file loading)
  • test_tables.py (tabular, multirow, empty tables)
  • test_math.py (math parsing, formulas, inline/display)
  • test_lists.py (itemize, enumerate, nested lists)
  • test_figures.py (includegraphics, missing images, captions)
  • test_macros.py (text formatting, cite, fallbacks, spacing)
  • test_environments.py (abstract, verbatim, lstlisting)

• Extracted shared dependencies, headers, and the latex_paths fixture into tests/test_latex/conftest.py for clean, native Pytest discovery.

• Also added an inline # type: ignore in docling/backend/html_backend.py to satisfy mypy pre-commit checks locally for missing Playwright stubs.

Checklist:

• Documentation has been updated, if necessary.
• Examples have been added, if necessary.
• Tests have been added, if necessary. (Refactored existing tests)

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[adityasasidhar]

Hey @PeterStaar-IBM , Please consider this PR for the issue #3281. Apologies for creating another PR, I had to close it because my older docling fork got riddled with multiple issues, merge conflicts and branches so the faster win would have been to start clean. ( Basically too close for missiles, switching to guns case ).

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
docling/backend/html_backend.py	0.00%	1 Missing ⚠️

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