Adds an Experiment and Milky plush (#5660)

## About The Pull Request

<img width="2048" height="1536" alt="image"
src="https://github.com/user-attachments/assets/b4cc8beb-3448-4a75-a193-cb9fad316820"
/>

🎨: [@Koklv_09](https://x.com/Koklv_09/status/2057418483688755627)  on X

This PR adds two plushies inspired from the hit game: Casualties Unknown
(Formerly "Scav: Prototype"). The sprites are originally from Wizden
SS14 and shares an appearance in its [own
game](https://scavprototype.wiki.gg/wiki/Plushie). Possibly confirming
shared universes??

Each Plush can be worn as a hat, have emissive eyes when worn, have
inhand sprites and are all very adorable.
Shout out to Orsoniks (rivey0 on discord) for the original spritework.
And nevimer for the code help.

## Why It's Good For The Game

This one goes out to all of the great times I've had on station
interacting with the Experiments. They deserve a tiny, cuddable version
of themselves!

## Proof Of Testing

<details>
<summary>Screenshots/Videos (Plushie interaction spoiler in
here!!)</summary>

Emissive preview:


https://github.com/user-attachments/assets/fd1b669b-36c3-4853-8b1b-4741de0b2b09

Unique Interaction preview:


https://github.com/user-attachments/assets/cddb1676-ec93-4c01-ae51-2ba20b853e21

</details>

## Changelog

🆑 shayoki, nevimer, orsoniks
add: Adds an experiment and milky plush. Both are available in the
loadout.
/🆑

modular_zubbers/code/game/objects/items/plushes.dm

@@ -763,3 +763,68 @@
 	var/datum/smite/bsa/bluespace_smite = new()
 	bluespace_smite.effect(user.client, user)
 	return BRUTELOSS
+
+//Sprite from SS14 Main. Sprited by Orsoniks (rivey0 on discord)
+/obj/item/toy/plush/expie
+	name = "Experiment Plushie"
+	icon_state = "expie"
+	slot_flags = ITEM_SLOT_HEAD
+	worn_icon = 'modular_zubbers/icons/mob/clothing/head/hats.dmi'
+	worn_icon_state = "expie"
+	desc = "A plushie of a canid of sorts. It yearns to be detonated on a landmine."
+	icon = 'modular_zubbers/icons/obj/toys/plushes.dmi'
+	attack_verb_simple = list("bark", "growl", "whine")
+	squeak_override = list('modular_zubbers/sound/misc/plushie.ogg' = 1)
+	lefthand_file = 'modular_zubbers/icons/mob/inhands/items/plushes_lefthand.dmi'
+	righthand_file = 'modular_zubbers/icons/mob/inhands/items/plushes_righthand.dmi'
+	inhand_icon_state = "expie"
+
+/obj/item/toy/plush/expie/worn_overlays(mutable_appearance/standing, isinhands, icon_file) //emissive glow when worn on head.
+	. = ..()
+	if(!isinhands)
+		. += emissive_appearance(icon_file, "[icon_state]-emissive", src, alpha = src.alpha, effect_type = EMISSIVE_BLOOM)
+
+/obj/item/toy/plush/expie/item_interaction(mob/living/feeder, obj/item/reagent_containers/applicator/pill/enom, list/modifiers)
+	if(!istype(enom))
+		return ..()
+	enom.forceMove(src) // pill go into the expie stummy
+	to_chat(feeder, span_notice("You feed the [enom] to [src] and watch as it eats..."))
+	playsound(src, 'modular_zubbers/sound/misc/eatcrunch.ogg', 75, TRUE)
+	addtimer(CALLBACK(src, PROC_REF(eat), feeder, enom), 3 SECONDS)
+	return ITEM_INTERACT_SUCCESS
+
+/obj/item/toy/plush/expie/proc/eat(mob/living/feeder, obj/item/reagent_containers/applicator/pill/enom)
+	if(istype(enom, /obj/item/reagent_containers/applicator/pill))
+		SpinAnimation(speed = 0.3 SECONDS, loops = 3)
+	qdel(enom)
+	return
+
+//expie reacts to being splashed
+/obj/item/toy/plush/expie/proc/splash_reagents()
+	SIGNAL_HANDLER
+	playsound(src, 'modular_zubbers/sound/misc/dogshake.ogg', 75)
+	spasm_animation(2 SECONDS)
+	visible_message(span_warning("[src] gets soaked and shakes itself off!"))
+
+/obj/item/toy/plush/expie/Initialize(mapload)
+	. = ..()
+	RegisterSignal(src, COMSIG_ATOM_SPLASHED, PROC_REF(splash_reagents))
+
+/datum/reagent/consumable/milk/expose_obj(obj/exposed_obj, reac_volume, methods=TOUCH, show_message=TRUE) //spill milk on the expie to make it milky
+	. = ..()
+	if(!istype(exposed_obj, /obj/item/toy/plush/expie))
+		return
+
+	var/obj/item/toy/plush/expie/milked = exposed_obj
+	milked.name = /obj/item/toy/plush/expie/milky::name
+	milked.desc = /obj/item/toy/plush/expie/milky::desc
+	milked.worn_icon_state = /obj/item/toy/plush/expie/milky::worn_icon_state
+	milked.icon_state = /obj/item/toy/plush/expie/milky::icon_state
+	milked.inhand_icon_state = /obj/item/toy/plush/expie/milky::inhand_icon_state
+
+/obj/item/toy/plush/expie/milky
+	name = "Milky Plushie"
+	desc = "A plushie of snowy-white, furred canid. Maybe it'll trade something with you?"
+	worn_icon_state = "milky"
+	icon_state = "milky"
+	inhand_icon_state = "milky"

modular_zubbers/code/modules/loadout/categories/toys.dm

@@ -142,6 +142,14 @@
 /datum/loadout_item/toys/plush/myrthel_plush
 	name = "Extra Hot Moth Plush"
 	item_path = /obj/item/toy/plush/myrthel_plush
+
+/datum/loadout_item/toys/plush/expie
+	name = "Experiment Plushie"
+	item_path = /obj/item/toy/plush/expie
+
+/datum/loadout_item/toys/plush/milky
+	name = "Milky Plushie"
+	item_path = /obj/item/toy/plush/expie/milky
 /*
 *	SEX TOYS AND OTHER STUFF THAT NEEDS PREFS TO USE (otherwise fails to render on the character preview)
 */

modular_zubbers/code/modules/vending/games.dm

@@ -17,6 +17,8 @@
 				/obj/item/toy/plush/carpplushie = 3,
 				/obj/item/toy/plush/cello_plush = 3,
 				/obj/item/toy/plush/chirp_plush = 3,
+				/obj/item/toy/plush/expie = 3,
+				/obj/item/toy/plush/expie/milky = 3,
 				/obj/item/toy/plush/goatplushie = 3,
 				/obj/item/toy/plush/headcrab = 3,
 				/obj/item/toy/plush/lizard_plushie = 3,