Data Sources - Drilldown prevalence by Month display issues

<img width="1212" height="641" alt="Image" src="https://github.com/user-attachments/assets/d5697106-ec83-459d-a0ec-b91538b76463" />

Looking at the `prevalenceByMonth` node of the response JSON from WebAPI: the data is not sorted by YYYYMM so suspect this display reflects the lack of sorting.