perf: cache sorted page tree and precompute nav map

[rsbh]

Summary

• Cache sorted page tree after first computation — getPageTree() no longer re-sorts on every call
• Precompute Map<url, {prev, next}> nav map — getPageNav() is now O(1) map lookup instead of flatten + linear search per request
• invalidate() clears all caches (source, tree, nav map)

Test plan

• All 88 tests pass
• API responds in ~3ms with caching vs repeated tree rebuilds
• Verify client-side page navigation works in browser
• Verify content invalidation (HMR) still refreshes nav correctly

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
chronicle	Ready	Preview, Comment	May 8, 2026 4:43am

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 098b0bbc-0b72-411e-a7bf-c00a8175c1b8

📥 Commits

Reviewing files that changed from the base of the PR and between 9e86794 and fa41af4.

📒 Files selected for processing (2)

• packages/chronicle/src/lib/source.ts
• packages/chronicle/src/server/entry-server.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch perf/cache-page-tree-and-nav

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