New boxes (#21439)

* Thoroughly resprites boxes. They're now more modular and, importantly,
colorable.
* Resprites cardboard, as a material.
* Repaths boxes behind the scenes to be more object-oriented, with boxes
being resorted into their own subtypes. You might notice this in the
gargantuan amount of files this PR changes.

Part of a bigger (yet modestly-sized still) resprites project. Atomized
the boxes bit into this PR specifically so that any conflicts don't
destroy any other spriting PRs.

<img width="652" height="273" alt="image"
src="https://github.com/user-attachments/assets/5590b22d-c9d7-49b5-9adf-0b6e01a6962b"
/>

<img width="383" height="345" alt="image"
src="https://github.com/user-attachments/assets/aab83040-2d5d-4283-b019-3d6bed2e3e47"
/>

<img width="142" height="343" alt="image"
src="https://github.com/user-attachments/assets/75a98d36-0171-4e48-9dec-de5511f35d39"
/>

<img width="127" height="225" alt="image"
src="https://github.com/user-attachments/assets/a1ff8b1b-bd2a-4c0d-b538-32fe401724c3"
/>

<img width="334" height="399" alt="image"
src="https://github.com/user-attachments/assets/e41330ac-ed4a-4e81-a87a-5ba901b47b5c"
/>

code/modules/organs/organ.dm

@@ -152,7 +152,7 @@ INITIALIZE_IMMEDIATE(/obj/item/organ)
 	// Don't process if we're in a freezer, an MMI or a stasis bag.or a freezer or something I dunno
 	if(istype(loc,/obj/item/device/mmi))
 		return
-	if(istype(loc,/obj/structure/closet/body_bag/cryobag) || istype(loc,/obj/structure/closet/crate/freezer) || istype(loc,/obj/item/storage/box/freezer))
+	if(istype(loc,/obj/structure/closet/body_bag/cryobag) || istype(loc,/obj/structure/closet/crate/freezer) || istype(loc,/obj/item/storage/box/unique/freezer))
 		return
 	//Process infections
 	if ((status & ORGAN_ROBOT) || (owner && owner.species && (owner.species.flags & IS_PLANT)))