Ability to flag/highlight pairs, which could be added as an attribute or a new column to the output
Incremental backup, probably by assigning change_table to .matchr_env with every next/previous button press
Turn the names display into a toggle on the page, instead of a function argument
Put the remove_duplicates stuff back into server, so it can be behind the loading spinner (and so the viewer version of the function just does a completely straightforward comparison of images)
Add some sort of progress reporting to the prep stage
Would be good: