Don't hide tocIgnore, add scroll into view for sidebar

[mdo]

Small QoL maybe for docs—expand the sidebar all the way so no headings are lost. Also adds a little scroll into view action for links further down the page so folks don't think there's not an active sidebar link.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Review	Updated (UTC)
pierrejs-diff-demo	Ready	Preview	Jan 8, 2026 0:04am
pierrejs-docs	Ready	Preview	Jan 8, 2026 0:04am
pierrejs-solid-diff-demo	Ready	Preview	Jan 8, 2026 0:04am

[Copilot]

Pull request overview

This PR improves the documentation sidebar user experience by ensuring all headings are visible (removing the tocIgnore filter) and automatically scrolling the active sidebar link into view so users can always see which section is currently active.

• Removes the tocIgnore filtering logic to show all headings in the sidebar
• Adds automatic scrolling of the active sidebar link into the center of the viewport
• Implements a ref to the nav element to enable programmatic scrolling

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

The scrollIntoView with smooth behavior may cause unwanted scrolling animations in the sidebar every time the user scrolls through the page and the active heading changes. This could be distracting or jarring for users, especially when scrolling quickly through multiple sections. Consider either removing the smooth behavior (using 'auto' instead) or adding a check to only scroll when the active link is outside the visible area of the sidebar.

Suggested change

	activeLink.scrollIntoView({ block: 'center', behavior: 'smooth' });
	activeLink.scrollIntoView({ block: 'center', behavior: 'auto' });