feat: add index_page config for content directories

[rsbh]

Summary

• New index_page option in chronicle.yaml content entries
• When visiting a content root (e.g., /docs), redirects to the specified page
• Falls back to first page in tree when index_page is not set

content:
  - dir: docs
    label: Docs
    index_page: getting-started  # /docs → /docs/getting-started

Test plan

• Set index_page: getting-started in config → /docs redirects to /docs/getting-started
• Remove index_page → /docs redirects to first page in tree
• Invalid index_page → redirects to the path (404 if page doesn't exist)
• Regular page navigation unaffected

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
chronicle	Ready	Preview, Comment	May 13, 2026 6:11am

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📥 Commits

Reviewing files that changed from the base of the PR and between 7ab1885 and 25828c9.

📒 Files selected for processing (2)

• packages/chronicle/src/pages/DocsPage.tsx
• packages/chronicle/src/types/config.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/content-index-page

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[rohilsurana]

This redirect fires for any 404 under the content directory, not just the content root. If a user navigates to /docs/nonexistent-page, it will still redirect to the index_page instead of showing 404.

Should be guarded with isContentRoot:

Suggested change

	if (contentConfig?.index_page) {
	return <Navigate to={`/${contentConfig.dir}/${contentConfig.index_page}`} replace />;
	}
	if (isContentRoot && contentConfig?.index_page) {
	return <Navigate to={`/${contentConfig.dir}/${contentConfig.index_page}`} replace />;
	}

Alternatively, move it after the isContentRoot check so it only applies to the content root URL.

[rohilsurana]

nit: might be worth adding a basic guard against path separators and file extensions so users don't accidentally pass something like getting-started.mdx or ../other-dir/page.

Suggested change

	index_page: z.string().optional(),
	index_page: z.string().regex(/^[a-zA-Z0-9][a-zA-Z0-9_-]*$/, 'index_page must be a simple slug without path separators or extensions').optional(),