fix: scroll sidebar to active item on navigation

[rsbh]

Summary

• Sidebar now scrolls active item into view when navigating via breadcrumbs or non-sidebar links
• Replaced scroll position preservation with scroll-to-active behavior using getBoundingClientRect for reliable position calculation
• Added data-active attribute to API sidebar items for consistent active item detection

Test plan

• Navigate to a deeply nested page via breadcrumb — sidebar should scroll to show active item
• Click sidebar items directly — sidebar should not jump if item is already visible
• Navigate API pages — sidebar should scroll to active API endpoint
• Verify mobile sidebar still closes on navigation

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
chronicle	Ready	Preview, Comment	May 27, 2026 4:23am

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 026f78a3-25a1-474d-9217-9aae94f00a88

📥 Commits

Reviewing files that changed from the base of the PR and between 7c9b4c2 and 5e94c7b.

📒 Files selected for processing (1)

• packages/chronicle/src/themes/default/Layout.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/sidebar-scroll-active-item

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