fix: keep active sidebar item visible

[ulofiai]

Description

• preserve the existing sidebar scroll restoration behavior while keeping the active link visible after navigation
• center the active sidebar link only when it falls outside the sidebar viewport
• match both the app pathname and the browser pathname so locale-prefixed links are handled
• add unit coverage for off-screen and already-visible active items

Validation

• git diff --check
• TypeScript/JSX syntax transpilation for the changed files
• targeted scroll-centering calculation checks
• full pnpm format, pnpm test, and pnpm build were not run because dependencies are not included in the bundle environment

Related Issues

Fixes #8828.

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run pnpm format to ensure the code follows the style guide.
• I have run pnpm test to check if all tests are passing.
• I have run pnpm build to check if the website builds without errors.
• I've covered new added functionality with unit tests if necessary.

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Project	Deployment	Actions	Updated (UTC)
nodejs-org	Ready	Preview	Aug 6, 2026 6:52pm

[cursor]

PR Summary

Low Risk
Localized UI scroll behavior in the site sidebar hook with unit tests; no auth, data, or API changes.

Overview
Extends useScrollToElement so that, after the existing saved scroll restore, it can scroll the sidebar to keep the current page’s link in view when a pathname is passed.

On mount/route change it finds the matching a[href] (comparing both usePathname() and window.location.pathname for locale-prefixed URLs). If the active item is outside the sidebar viewport, it scrolls to center it; if it’s already visible, it does nothing. WithSidebar now passes pathname into the hook.

Unit tests cover off-screen centering (expected scrollTop: 720) and the no-scroll-when-visible case.

^{Reviewed by Cursor Bugbot for commit bc1941c. Bugbot is set up for automated code reviews on this repo. Configure here.}