Consolidate bulk operations into one view?

Bulk operations are split between the sidewalk and crossing tab. Especially since there's often an order to apply them and it involves going to both, it could be a simpler UX to put them all on one tab.

The trouble is that there are two map views that're relevant. When generating crossing nodes, the user needs to see the crossing view and adjust filters for the junctions. That view pretty deliberately hides all the noisy lines. Maybe the bulk page could show the lines by default, and when the user opens the control for crossing nodes, it switches? Or maybe that's more complicated than the current design.

Look at the existing bulk operation views in the sidewalk and crossing tabs. Understand how the two map views (crossing view and line view) are implemented and toggled. The goal is to design a unified UI that can switch contexts based on the operation, likely involving Svelte components for map controls and state management.

Written by the indexing model from the issue text.