Sticker packs/Chief Engineer sticker (#86154)

## About The Pull Request

- Changes sticker container from a generic box to a specialised 'sticker
pack' with label
- Adds a Chief Engineer seal of approval sticker


![image](https://github.com/user-attachments/assets/7b1d8789-6a06-46ec-a2a3-be4272eb5268)

## Why It's Good For The Game

The CE can now quell crew concerns about machinery they find in the
hallway

Before:


![ce_sticker_1](https://github.com/user-attachments/assets/0e7c1752-743f-4b6a-8e5c-8627a3f11d82)

After:


![ce_sticker_2](https://github.com/user-attachments/assets/82f74a09-f007-45ad-8dcd-f70840681ba6)

## Changelog

🆑 LT3
add: Added Chief Engineer SEAL OF APPROVAL sticker
code: Stickers now come in sticker packs, not boxes
code: Stickers can now add examine text to whatever they're stuck on
/🆑

code/game/objects/items/storage/boxes/engineering_boxes.dm

@@ -112,3 +112,12 @@
 	..()
 	for(var/i in 1 to 7)
 		new /obj/item/tank/internals/emergency_oxygen/engi(src) //in case anyone ever wants to do anything with spawning them, apart from crafting the box
+
+/obj/item/storage/box/stickers/chief_engineer
+	name = "CE approved sticker pack"
+	desc = "With one of these stickers, inform the crew that the contraption in the corridor is COMPLETELY SAFE!"
+	illustration = "label_ce"
+
+/obj/item/storage/box/stickers/chief_engineer/PopulateContents()
+	for(var/i in 1 to 3)
+		new /obj/item/sticker/chief_engineer(src)