[MDB IGNORE] Adds new features and tiles for lavaland biomes (#95955)

## About The Pull Request

Adds new floor types and natural decor to both Siderite and Shale
biomes, as well as makes flora and fauna spawns differ between said
biomes.

<img width="1216" height="997" alt="dreamseeker_uIv1OgVkpD"
src="https://github.com/user-attachments/assets/327d9caa-a58c-4d70-acbe-477da69b4d71"
/>

---

Basalt biome now spawns more legions and goliaths, but less watchers and
no brimdemons. You can rarely find new volcanic pore rocks which will
spew out lava when destroyed.

<img width="505" height="361" alt="dreamseeker_TA9rXzOgad"
src="https://github.com/user-attachments/assets/fb19a60a-c927-441b-abad-161ce5022a60"
/>


Siderite biome has a lot of rock formations and may sometimes spawn new
stalagmites. You can expect to see a ton of bileworms, raptors and
watchers there.


<img width="747" height="613" alt="dreamseeker_uZgRX8qqh3"
src="https://github.com/user-attachments/assets/d356f1c6-371a-4b8b-899b-470edb0d2790"
/>


Shale is full of lobstrocities, goldgrubs and brimdemons, and home to a
new glowgrowth "plant" - colony of bioluminescent fungi growing on
natural air vents.

<img width="274" height="220" alt="dreamseeker_EtxiS4X9M7"
src="https://github.com/user-attachments/assets/cbefba67-b618-4a65-ad12-9ee5182b650c"
/>


While it cannot be planted by itself, it contains luminescent fluid
inside which will grant whoever eats it minor night vision as long as it
is inside their bloodstream (as well as cyan-glowing eyes)

---

Ruins now properly respect their biome's rock (and now floor as well)
type, since it was broken for some of them previously.

<details>
<summary>More images under the dropdown</summary>

<img width="1216" height="997" alt="dreamseeker_fpXXV0Rt3D"
src="https://github.com/user-attachments/assets/fa790ca1-7045-490e-bcb2-c1f9da9f277c"
/>
<img width="414" height="303" alt="dreamseeker_l6E8S2fzCe"
src="https://github.com/user-attachments/assets/8b10dcca-c546-41ce-9363-a12b0f225881"
/>
<img width="784" height="587" alt="dreamseeker_RUWQo0unNp"
src="https://github.com/user-attachments/assets/d7364abc-ec68-4daf-b3cb-a03b8ba7e5de"
/>
<img width="1216" height="997" alt="dreamseeker_zoltABvkBw"
src="https://github.com/user-attachments/assets/324f50f8-83c9-4451-8eff-33ebf81c1d0d"
/>
<img width="1125" height="571" alt="dreamseeker_ky5qvl2XtC"
src="https://github.com/user-attachments/assets/ff08d22f-fc15-4961-b76e-7c10d7814096"
/>

</details>

Credit for original versions of new flora/feature sprites to
SentryPrimis on the /tg/station discord

## Why It's Good For The Game

Makes biomes more distinct and interesting, as well as gives them unique
atmosphere, since right now they only differ in rock type and mineral
distribution.

## Changelog
🆑 SmArtKar, SentryPrimis
add: Siderite and Shale lavaland biomes now have unique floors, as well
as flora, features and fauna!
fix: Fixed some ruins generating with default basalt walls instead of
their biome's walls
/🆑

code/game/objects/structures/flora.dm

@@ -1059,9 +1059,82 @@
 
 /obj/structure/flora/rock/pile/style_random/Initialize(mapload)
 	. = ..()
-	icon_state = "lavarocks[rand(1, 3)]"
+	icon_state = "lavarocks[pick(3;1,3;2,1;3)]"
 	update_appearance()
 
+/obj/structure/flora/rock/pile/siderite
+	icon_state = "lavarocks_siderite1"
+
+/obj/structure/flora/rock/pile/siderite/get_potential_products()
+	return list(/obj/item/stack/ore/glass/siderite = 1)
+
+/obj/structure/flora/rock/pile/siderite/style_2
+	icon_state = "lavarocks_siderite2"
+
+/obj/structure/flora/rock/pile/siderite/style_3
+	icon_state = "lavarocks_siderite3"
+
+/obj/structure/flora/rock/pile/siderite/style_random/Initialize(mapload)
+	. = ..()
+	icon_state = "lavarocks_siderite[pick(3;1,3;2,1;3)]"
+	update_appearance()
+
+/obj/structure/flora/rock/pile/shale
+	icon_state = "lavarocks_shale1"
+
+/obj/structure/flora/rock/pile/shale/style_2
+	icon_state = "lavarocks_shale2"
+
+/obj/structure/flora/rock/pile/shale/style_3
+	icon_state = "lavarocks_shale3"
+
+/obj/structure/flora/rock/pile/shale/style_random/Initialize(mapload)
+	. = ..()
+	icon_state = "lavarocks_shale[pick(3;1,3;2,1;3)]"
+	update_appearance()
+
+/obj/structure/flora/rock/siderite_growth
+	name = "siderite growth"
+	desc = "A natural stalagmite formed of siderite, with thin pointy strands of dirty metal sticking out of the top."
+	icon_state = "siderite_growth1"
+	base_icon_state = "siderite_growth"
+	icon = 'icons/obj/mining_zones/terrain.dmi'
+	harvest_message_med = "You finish mining the growth."
+
+/obj/structure/flora/rock/siderite_growth/Initialize(mapload)
+	. = ..()
+	icon_state = "[base_icon_state][pick(3;1,3;2,1;3)]"
+	update_appearance()
+	AddComponent(/datum/component/seethrough, SEE_THROUGH_MAP_DEFAULT)
+
+/obj/structure/flora/rock/siderite_growth/get_potential_products()
+	return list(/obj/item/stack/ore/glass/siderite = 1)
+
+/obj/structure/flora/rock/volcano
+	name = "volcanic pore"
+	desc = "A miniature volcano-like rock formed of the lava slowly pouring from it."
+	icon_state = "volcano_1"
+	base_icon_state = "volcano"
+	harvest_message_med = "You finish mining the pore buildup."
+	light_range = 3
+	light_power = 2.5
+	light_color = LIGHT_COLOR_LAVA
+
+/obj/structure/flora/rock/volcano/Initialize(mapload)
+	. = ..()
+	icon_state = "[base_icon_state]_[rand(1, 5)]"
+	update_appearance()
+
+/obj/structure/flora/rock/volcano/update_overlays()
+	. = ..()
+	. += emissive_appearance(icon, "[icon_state]_e", src, alpha = 200)
+
+/obj/structure/flora/rock/volcano/after_harvest(user)
+	var/turf/open/our_turf = loc
+	if (istype(our_turf))
+		our_turf.ChangeTurf(/turf/open/lava/smooth, flags = CHANGETURF_INHERIT_AIR)
+	return ..()
+
 /obj/structure/flora/rock/pile/jungle
 	icon_state = "rock1"
 	icon = 'icons/obj/fluff/flora/jungleflora.dmi'