Fix PDF loading task cleanup

[serg33v]

pdfDocument.destroy();
doesnt exist.
correct way to use it is
pdfDocument.loadingTask.destroy();

Summary by CodeRabbit

• Bug Fixes
  • Improved PDF image extraction cleanup to ensure document loading tasks are properly released.
  • Cleanup errors continue to be handled without interrupting extraction.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 092ce0b and 607cf50.

📒 Files selected for processing (1)

• src/tools/pdf/extract-images.ts

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📝 Walkthrough

Walkthrough

Changes

PDF worker cleanup

Layer / File(s)	Summary
Loading-task destruction src/tools/pdf/extract-images.ts	Image extraction now unconditionally awaits pdfDocument.loadingTask.destroy() during cleanup. Cleanup errors remain ignored.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 607cf

The cleanup change matches the loading-task lifecycle contract and preserves error handling, so the PR is mergeable.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: fixing PDF loading task cleanup.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[serg33v]

there is also same problem in src/tools/pdf/lib/pdf2md.ts but not clear what type is there