fix: use Apsara typography tokens for heading sizes

[rsbh]

Summary

• Replace hardcoded heading font sizes with Apsara design tokens
• h1: --rs-font-size-t4 (32px), h2: --rs-font-size-t3 (28px), h3: --rs-font-size-t2 (24px), h4: --rs-font-size-t1 (20px), h5: --rs-font-size-large (16px), h6: --rs-font-size-regular (14px)
• Applied to both default and paper themes

Test plan

• Verify h1-h6 render at correct sizes in default theme
• Verify h1-h6 render at correct sizes in paper theme
• Check heading hierarchy is visually distinct

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
chronicle	Ready	Preview, Comment	May 21, 2026 4:21am

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 93281e5e-0dc8-4d47-a567-88584545b4db

📥 Commits

Reviewing files that changed from the base of the PR and between 9acd409 and c477bd3.

📒 Files selected for processing (2)

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

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/heading-font-sizes

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