Fixed a typo in a comment.
Triggered download on enter keypress in filename text input.
This removes columns that the user clicks on.

Because I find it stressful to open up that <select> again and again. I just
have to find a way to let this feature document itself.
Changed :hover cursor to show columns are clickable.
Removed link-ish look of the .geometry <a> bullet point.

Now that its clickability is documented enough by a changing cursor, I changed
it to look like normal text.