Comment 6 for bug 1615781

I have updated the branch to correct the issues Jane spotted in #4. Thanks, Jane!

I've also added an improvement to the column resizing so that you can shrink a column to be narrower than its longest word. Admin > Hold Matchpoint Weights is a good place to try this out.

There is also a change to the TypeScript compile version. My colleagues have stated a preference for a fixed target rather than a moving one, so I've used ES2021 instead of ESNext.

I've left these follow-up commits visible for now, but they can be squashed later.