Awesome man! Very cool stuff. Love how conditions get sent to the var bar so you can link to the page afterwards.

Not going to really try to review the code here, but I pulled it locally, and just a few comments/suggestions:

1. Should the state nav bar on the left possibly also be integrated into the search bar as another filter? My worry would be that you put in a bunch of work applying custom filters, then realize that you're on the wrong state tab, so you have to click the right state tab and then you lose all your filters.

2. When selecting a filter from the possibilities list, I found myself wanting to hit "tab" to complete it and move into it to select criteria (similar to how Vim's selection modals work, but also others), but if you do that, you tab right out of everything, and then need to use the mouse to select back in again. It turns out that you have to use "enter" instead of "tab" for this to work. I wonder if both buttons could do it? (And reserve deselect for "escape" or something?)

3. Similarly, I find that once I'm entering criteria, it'd be nice to be able to hit "enter" to be able complete the criteria (especially since the point in (2) just trained me to use "enter" instead of "tab"), but this doesn't work as it deselects and loses focus. In an inversion of (2), you have to know to use "tab" in this case and not "enter". Could "enter" work as well in addition to "tab"?

Even if the answer to (2) and (3) is "no", IMO we should be consistent in either the use of "tab" or "enter" to carry about both actions, not one in one case and the other in the other.

1. Yeah I can apply that behavior to preserve filters when navigating between states. Done ✅
2. Tab currently jumps between filter elements, so I don't think I can switch it to navigate the autocomplete dropdown without breaking that. You can use up/down arrow keys to navigate the list of course.
3. Pressing enter does finalize either an autocomplete choice or a given filter element. However there's a bug where after finalizing a single filter item Enter doesn't bump you to adding a new filter, which was how it's supposed to work—I've fixed that. ✅

Another aspect to highlight about this search input: it attempts to behave as a single input in most ways, such as being able to use left/right arrows to continuously move the cursor between filters. Ideally it should be easy to use only the keyboard or to avoid needing to switch between input modes repeatedly.