First, I suppose, the good news:
Email filtering, such as it is, is done. My goal with the item is complete! My DataTable component has expanded and I now have a component that takes a bunch of stuff, and the page at exists solely as a wrapper around the . (Plus I added filtering, the whole point of the exercise — and the most trivial one.) There are a couple things I need to do before merging, like better type information and fixing where the dropdown menu appears, but it is Done.