📝 Add docstrings to codex/fix-48h-review-findings

[coderabbitai]

Docstrings generation was requested by @BigSimmo.

• fix: harden anonymous quotas and metadata origins #550 (comment)

The following files were modified:

• src/app/layout.tsx
• src/components/DocumentViewer.tsx
• src/lib/api-rate-limit.ts
• src/lib/document-viewer-navigation.ts
• src/lib/metadata-base.ts
• src/lib/public-api-access.ts

These files were ignored

• tests/api-rate-limit-fallback.test.ts
• tests/document-viewer-navigation-source.test.ts
• tests/production-metadata-source.test.ts
• tests/public-api-access.test.ts
• tests/ui-smoke.spec.ts

These file types are not supported

• .env.example

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[BigSimmo]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Merge conflicts resolved in 6aba3a5. The base branch (codex/fix-48h-review-findings) had added concise single-line docstrings to the same functions — merged keeping the more detailed multi-line JSDoc docstrings from this PR.