Figure out when the "Clear filters" and "Recommended filters" toggles should be visible

Problem/Motivation

In the long, long quest to make the Svelte app maintainable, 📌 Remove all remaining instance-specific constants from the Svelte code Active removed the dynamic toggling of the "Clear filters" and "Recommended filters" links.

I think it was the right move, because they are questionable from a usability standpoint. How is a user supposed to know what conditions will make "Recommended filters" visible? Or "Clear filters"? There is no sense of that; to someone who doesn't know what makes a filter "recommended", these links will seem to appear and disappear more or less at random.

If we want these to visible dynamically, we should think through the interaction carefully and add strong test coverage to confirm that it works as we intend. There was no preexisting test coverage of the visibility behavior, so that leads me to believe that the user interaction has never actually been thought through.