Random Work button now available on the Marked For Later list
reworked code - script picks first a random page, then on that page a random work. that means statistically there's now a higher chance that a work on the last page is returned more often, if that last page contains less than 20 works. unfortunately it's the only way a randomizer can work on Marked For Later (without having to actually load the last page each time in addition), since AO3 doesn't expose the total number of works in History like it does in Filters.
