Sankey issues

- [ ] Network Tree view only displays top 3 on the first level.
- [ ] Expand the 'top level sankey' chart to have options for 2-3 levels. For a single next-hop it's kinda useless. 

<img width="720" height="291" alt="Image" src="https://github.com/user-attachments/assets/b3c16828-9f60-4eb5-be70-98ed8e1c333c" />