Add details to zip safety errors

[ErisDS]

Summary

• Add machine-readable codes and human-readable context to existing zip symlink and filename safety errors.
• Include entry name and byte details in errorDetails where available.
• Update tests to assert the richer Ghost error shape.

Testing

• pnpm --filter @tryghost/zip test
• pnpm exec oxfmt -c .oxfmtrc.json --check \"packages/zip/**/*.{js,json,md}\"

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 5693c563-710f-4928-9d5e-4536e11677be

📥 Commits

Reviewing files that changed from the base of the PR and between 6a18dff and 219a3a9.

📒 Files selected for processing (2)

• packages/zip/lib/extract.js
• packages/zip/test/zip.test.js

---

Walkthrough

This PR enhances error reporting for ZIP extraction validation failures. Two validation functions (throwOnSymlinks and throwOnLargeFilenames) now throw UnsupportedMediaTypeError with structured error details: explicit context/code fields and errorDetails containing relevant metadata (entry name, observed/limit byte counts). Corresponding test assertions are updated from simple message regex matching to comprehensive validation of the complete error object properties, ensuring the enriched error structure is properly reported.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adding enhanced error details (codes, context, entry names, byte information) to existing zip safety error handling for symlinks and filenames.
Description check	✅ Passed	The description is directly related to the changeset, detailing the addition of machine-readable codes, human-readable context, and entry/byte details to zip safety errors, matching the implemented changes.
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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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/zip-existing-error-details

Warning

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (6a18dff) to head (219a3a9).

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #636      +/-   ##
===========================================
+ Coverage   98.12%   100.00%   +1.87%     
===========================================
  Files          84         2      -82     
  Lines        2770        75    -2695     
  Branches      510        12     -498     
===========================================
- Hits         2718        75    -2643     
+ Misses         11         0      -11     
+ Partials       41         0      -41     

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