Update sidenav to scroll down to current page when necessary

[coolguyzone]

DESCRIBE YOUR PR

Keeps the scroll depth of the nav in sync with the page you are on. See it on pages buried in the nav, e.g. https://sentry-docs-git-nav-scroll-update.sentry.dev/concepts/otlp/otlp-traces/

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Project	Deployment	Actions	Updated (UTC)
develop-docs	Ready	Preview, Comment	Feb 11, 2026 10:09pm
sentry-docs	Ready	Preview, Comment	Feb 11, 2026 10:09pm

[Copilot]

Pull request overview

This pull request updates the sidebar navigation scroll behavior to automatically scroll the active link into view when necessary. The changes refactor the component from using a hardcoded aside element selector to dynamically finding the actual scrollable container, and adds automatic scrolling for the active link when there's no stored position (e.g., on page load or refresh).

Changes:

• Introduced a findScrollContainer helper function to dynamically locate the scrollable container instead of hardcoding aside element lookups
• Refactored both useEffect hooks to use the dynamic scroll container
• Added automatic scrolling behavior using scrollIntoView when no previous position is stored in sessionStorage
• Wrapped the second useEffect's logic in requestAnimationFrame to ensure DOM is fully rendered

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[sfanahata]

👏 Bless you