feat: render frontmatter title in default theme

[rsbh]

Summary

• Render frontmatter title as h1 above page content in default theme
• Users should remove # Title from MDX body to avoid duplicate headings

Test plan

• Page with frontmatter title + no h1 in body → title shows
• Page with frontmatter title + h1 in body → both show (user removes h1)
• Page without frontmatter title → no extra heading

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
chronicle	Ready	Preview, Comment	May 13, 2026 9:48am

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: a4f0b1db-ace8-4265-8527-0b0469af15d8

📥 Commits

Reviewing files that changed from the base of the PR and between 3421242 and 0c714c2.

📒 Files selected for processing (2)

• packages/chronicle/src/themes/default/Page.module.css
• packages/chronicle/src/themes/default/Page.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/frontmatter-title

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