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/game/objects/items/weapons/storage/fancy.dm

@@ -25,6 +25,7 @@
 	var/opened_icon_state = null //for items that have unique base icons but look the same opened, such as all the various microwave pizzas.
 	foldable = null // most of this stuff isn't foldable by default, e.g. cig packets and vial boxes
 	contained_sprite = TRUE
+	color = COLOR_WHITE
 
 /obj/item/storage/box/fancy/mechanics_hints(mob/user, distance, is_adjacent)
 	. += ..()

code/game/objects/items/weapons/storage/uplink_kits.dm

@@ -1,7 +1,8 @@
 /obj/item/storage/box/syndie_kit
 	name = "box"
 	desc = "A sleek, sturdy box."
-	icon_state = "syndiebox"
+	color = COLOR_WALL_GUNMETAL
+	label = "label_syndie"
 	worn_overlay = "writing_syndie"
 
 /obj/item/storage/box/syndie_kit/imp_freedom