fix: meta.json order sorting for folders without index pages

[rsbh]

Summary

• Fix folder sorting by meta.json order — folders without index pages were not sorting because the logic relied on node.index.url which was undefined
• Derive folder path from first child page URL to match against folderOrderMap
• Remove index page frontmatter order fallback for folder sorting — folders sort only by meta.json order
• Add sorting documentation for pages and folders

Changes

• source.ts: derive folder path via getFolderPath(), remove pageOrderMap fallback for folders
• features.mdx: add "Sorting Pages and Folders" section

Test plan

• Create meta.json with order in folders — sidebar sorts correctly
• Works for folders without index pages
• Index page frontmatter order does NOT affect folder position
• Index page frontmatter order still sorts the page within the folder
• Folders without order appear at the end

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Project	Deployment	Actions	Updated (UTC)
chronicle	Ready	Preview, Comment	May 14, 2026 4:46am

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

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Run ID: 76f90fff-ed47-4321-90cc-5dc52e898895

📥 Commits

Reviewing files that changed from the base of the PR and between 28eae37 and debd22e.

📒 Files selected for processing (2)

• examples/basic/content/docs/features.mdx
• packages/chronicle/src/lib/source.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/meta-json-folder-sort

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