June 2025: Focused on stabilizing and improving Outline Navigation in the marimo project. Delivered a precise fix for the Table of Contents highlighting when multiple headings share the same name by implementing tracking of id-header pairs to ensure only the correct heading instance is highlighted. The change improves navigation accuracy, reduces user confusion, and enhances accessibility across documents without altering the public API. The work was completed in the marimo-team/marimo repository and aligns with ongoing efforts to improve document ergonomics and developer ergonomics. Key follow-ups include ensuring the fix remains regression-free and maintaining performance within the existing outline/navigation module. Commit reference: 4964b299404c9aa1e9005a62f3ede221f737d19c.