Show numbers when hovering over bar graphs in diagnostic checks

Hovering over the bar charts in the diagnostics checks section doesn't show any numbers so it's actually hard to understand what the user is looking at. We should add a labels to the bars upon hover.

<img width="2108" height="1054" alt="Image" src="https://github.com/user-attachments/assets/ae1e9982-75ff-43e8-8147-69895699ea2a" />