Increase hit zone for swapping/moving cards in Deckeditor

[FormularSumo]

Currently your mouse has to be exactly on the card, which sometimes feels a bit broken. It'd be better if the cards were to swap whenever they are touching. The main problem with this is that multiple cards could be touching at once, so there'd have to be a system where it decides which one it is closer to/overlapping more with/touched first, and possible some kind of visual indicator as to which is currently selected.

[FormularSumo]

Ideal behaviour here would be that anything that is touching the card is eligible for an action (other cards including blank, remove card button), and the one that's selected/carried out is the one that the highest proportion of the card is touching.