Item rarity background doesn't work with slots rendered by other mods

[lunaynx]

Firmament Version

3.4.0+mc1.21.5

Bug Description

The item rarity background feature doesn't work with other mods that render slots, e.g. Skyblocker's equipment in inventory.

Minecraft Log

[lineargraph]

they probably dont add actual slots, instead just rendering the items. that is of course correct since you probably dont want extra slots to exist and potentially send data to the server. i could probably integrate better with fabrics own events to make the slots work.