Si'akh Flame Priest Robes (#19055)

Adds robes of Si'akh flame priests to the Unathi Loadout. These robes
are basically the same as the Sk'akh ones, but they lack the gilded
chains and ornamentation, and have different descriptions to match the
ascetic nature of their faith.

Worn sprite

![image](https://github.com/Aurorastation/Aurora.3/assets/30341877/2b1deeb2-9e28-481b-8982-f87e3923580d)

in-hand sprite

![image](https://github.com/Aurorastation/Aurora.3/assets/30341877/7504f180-e831-4e23-b83f-4122e62307a6)

code/modules/client/preference_setup/loadout/items/xeno/unathi.dm

@@ -464,7 +464,7 @@
 	cost = 1
 	whitelisted = list(SPECIES_UNATHI)
 	sort_category = "Xenowear - Unathi"
-	allowed_roles = list("Chaplain")
+	allowed_roles = list("Chaplain", "Off-Duty Crew Member")
 	flags = GEAR_HAS_NAME_SELECTION | GEAR_HAS_DESC_SELECTION
 
 /datum/gear/uniform/unathi/skakh/New()
@@ -475,3 +475,12 @@
 	robes["Sk'akh healer's robes"] = /obj/item/clothing/under/unathi/skakh/healer
 	robes["Sk'akh warrior's robes"] = /obj/item/clothing/under/unathi/skakh/warrior
 	gear_tweaks += new /datum/gear_tweak/path(robes)
+
+/datum/gear/uniform/unathi/siakh
+	display_name = "Siakh robes"
+	path = /obj/item/clothing/under/unathi/siakh
+	cost = 1
+	whitelisted = list(SPECIES_UNATHI)
+	sort_category = "Xenowear - Unathi"
+	allowed_roles = list("Chaplain", "Off-Duty Crew Member")
+	flags = GEAR_HAS_NAME_SELECTION | GEAR_HAS_DESC_SELECTION

code/modules/clothing/under/xenos/unathi.dm

@@ -154,3 +154,9 @@
 	desc = "A set of gray cloth wrappings, used in traditional Sinta'Mador burials. Remarkably well preserved with age."
 	icon_state = "mador_wrappings"
 	item_state = "mador_wrappings"
+
+/obj/item/clothing/under/unathi/siakh
+	name = "\improper Si'akh priest robes"
+	desc = "Ascetic brown robes, favored by Flame Priests of the Si'akh Church."
+	icon_state = "siakh"
+	item_state = "siakh"

html/changelogs/Crosarius - siakhrobes.yml

@@ -0,0 +1,8 @@
+author: Crosarius
+
+delete-after: True
+
+changes:
+  - imageadd: "Added sprites for Si'akh Priest robes"
+  - rscadd: "Added Si'akh Priest robes to the Unathi xeno loadout."
+  - qol: "Allows Si'akh Priest robes and Sk'akh Priest robes to be taken by Off Duty & Visitor crewmember roles."