indicate preserved routes

users without comma prime will see old preserved routes instead of no routes when all of their drives are older than 3 days. Indicate that those are the preserved routes to make it clear they do not have comma prime

make it possible to filter by bookmarked routes

Start by locating the route list UI and the code that displays routes older than three days. Confirm the current behavior for users without comma prime, then make preserved routes identifiable and add filtering for bookmarked routes; done means both behaviors are visible and verifiable in the interface.

Written by the indexing model from the issue text.