Add Watchlist icon to poster overlay
If you put the icon next to 'watched' and 'favorite' it would save the extra clicking and hunting to see if i already have the item on my watchlist. Also, it would save the extra clicks of having to put the item on watchlist, which is a frequently used option, like 'watched' and 'favorite'.
Be good to see an icon on the grid overview to do determine if its on watch list/watched at a glance
Similar to the eye button and the heart button, a quick add for adding to watchlist when hovering as opposed to clicking the ellipses