[FEATURE] Table column headers persist when scrolling down records

[roanbear]

When you scroll down records the table headers get hidden. This may be confusing to users when selecting records if they forget what each column represents.

The table column headers on both left and selected columns should persist at the top of the table when scrolling.
We need to make sure this doesn't cause more confusion - we may need to add row numbers or some other indicator to the user that they are not viewing all records.