Option to turn the raw signals panel into a page

- It would be great also to make it possible for people to share a link to such page that would keep the exact selection of entities currently selected

Start by locating the raw signals panel and reviewing how its selected entities are represented. Define the page and link behavior from the issue: a shared URL should open the raw signals view with the exact current entity selection preserved. No files or tests are named, so identify the relevant entry point and add coverage for restoring that selection.

Written by the indexing model from the issue text.