- Extract shared loader and navigation helpers for file detail views
- Split router analysis into reusable summary and section components
- Add chart crosshair support to spectrum and structure function views

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

## Release Notes

* **New Features**
  * Added vertical crosshair visualization to netflow spectrum charts for improved data interaction
  * Introduced singularities analysis capability with dedicated loading and error handling for source and destination views

* **Improvements**
  * Enhanced netflow file detail page layout with reorganized analysis sections
  * Refined router analysis pane structure for better data presentation

<!-- end of auto-generated comment: release notes by coderabbit.ai -->