Document Indicator Does Not Update When Using Back Navigation

[JonellaCulmer]

Summary

When navigating between documents in the sidebar (changing the doc_id), the on‑page indicator showing which document is being viewed does not update correctly as the user presses the Back button.

**What should have happened?**

When the user clicks Back, the visible document indicator should update to reflect the document associated with the restored doc_id in the URL.

Frequency/ steps to reproduce

Ongoing; consistently reproducible.

• Visit: https://www.fec.gov/legal/rulemakings/2019-04/?doc_id=425040
• Click a different document in the list to load a new doc_id.
• Press the browser Back button.
• The URL updates (sometimes to the prior doc_id, sometimes without it), but the document indicator on the page does not change accordingly.

Completion criteria

• Document header/indicator listens to URL changes (including back/forward navigations) and re-renders correctly based on the active doc_id.