Area-based Horizon lighting (#22511)

This adds unique lighting palettes to different areas of the SCCV
Horizon. It does this by tying randomized_lighting variable for light
fixtures to the department variable of the area they are in. This
solution is intended to save a lot of time and effort, both now and
later, which would otherwise be spent mapping down each colour of
lighting into every department manually.

Notable points:
- This shifts the parent colour for light bulbs from LIGHT_COLOR_HALOGEN
(#C0C0CA) to the new LIGHT_COLOR_OFFWHITE (#efe5bb), and shifts the
randomized_colors variable to the according list. This shifts them from
a slightly murky blue-tinted white to a slightly brighter yellow-tinted
white. Slightly warm lighting will now be the default for every map.
Warmer lighting communicates the age of a ship or station, the worsening
economic prospects of the setting, and it's also a bit cosier.
- Stark white lighting is retained for medical and the bridge. Research
has been given purple-tinted lighting.
- Command offices are also under blue lighting currently, to visually
differentiate them from the rest of their departments.
- To avoid too much player-facing bloat, only a box for pale purple has
been added so janitors can replace the lighting in research. Otherwise,
yellow can be used for engineering, white for public areas, and blue for
high-security areas.
- Offsites and offships shouldn't be hugely changed by the shift in
default lighting - it's a slight change in hue.

Screenshots below!
<details>
<img width="1077" height="1080" alt="image"
src="https://github.com/user-attachments/assets/1987e29f-c34c-44ea-865f-5f81c0e5c47f"
/>
<img width="1080" height="1080" alt="image"
src="https://github.com/user-attachments/assets/79279c6c-da56-4676-a0e9-7e5db43002cd"
/>
<img width="1083" height="1080" alt="image"
src="https://github.com/user-attachments/assets/621589b5-ada6-4d80-9f8f-8cf13a47df39"
/>
<img width="1085" height="1080" alt="image"
src="https://github.com/user-attachments/assets/09284700-8408-4a86-86c5-7575e7c94a27"
/>
<img width="1081" height="1080" alt="image"
src="https://github.com/user-attachments/assets/8246585c-f437-437a-8d32-9997fae05298"
/>
<img width="1078" height="1080" alt="image"
src="https://github.com/user-attachments/assets/a34841dd-3f49-4010-b2e0-d2e9a748e617"
/>
<img width="1084" height="1080" alt="image"
src="https://github.com/user-attachments/assets/55e89703-8ac7-4fa7-9775-19818c10c119"
/>
<img width="1080" height="1080" alt="image"
src="https://github.com/user-attachments/assets/684dea04-90c5-4877-b2bf-08a2146efb5e"
/>
<img width="1078" height="1080" alt="image"
src="https://github.com/user-attachments/assets/6ce42ac1-0f4b-49eb-8f2c-c6fb1830877e"
/>
<img width="1083" height="1080" alt="image"
src="https://github.com/user-attachments/assets/bc41a4f4-8d5c-4348-b9fe-a41d7950ce37"
/>
<img width="1081" height="1080" alt="image"
src="https://github.com/user-attachments/assets/48c4b733-a375-482b-9f70-e2aa6d0b3e27"
/>
<img width="1083" height="1080" alt="image"
src="https://github.com/user-attachments/assets/52e0041a-602d-4f4b-9d6c-7d0a0946f90b"
/>
</details>

code/modules/power/lights/bulbs.dm

@@ -16,11 +16,11 @@
 	var/rigged = 0		// true if rigged to explode
 	var/brightness_range = 2 //how much light it gives off
 	var/brightness_power = 0.45
-	var/brightness_color = LIGHT_COLOR_HALOGEN
+	var/brightness_color = LIGHT_COLOR_OFFWHITE
 	var/lighttype = null
 	var/randomize_range = TRUE
 	var/randomize_color = TRUE
-	var/list/randomized_colors = LIGHT_STANDARD_COLORS
+	var/list/randomized_colors = LIGHT_WARM_COLORS
 
 /obj/item/light/antagonist_hints(mob/user, distance, is_adjacent)
 	. += ..()
@@ -134,6 +134,10 @@
 	name = "magenta light tube"
 	brightness_color = LIGHT_COLOR_VIOLET
 
+/obj/item/light/tube/colored/pale_purple
+	name = "pale purple light tube"
+	brightness_color = LIGHT_COLOR_PALE_PURPLE
+
 /obj/item/light/tube/colored/yellow
 	name = "yellow light tube"
 	brightness_color = LIGHT_COLOR_YELLOW
@@ -186,6 +190,10 @@
 	name = "magenta light bulb"
 	brightness_color = LIGHT_COLOR_VIOLET
 
+/obj/item/light/bulb/colored/pale_purple
+	name = "pale purple light tube"
+	brightness_color = LIGHT_COLOR_PALE_PURPLE
+
 /obj/item/light/bulb/colored/yellow
 	name = "yellow light bulb"
 	brightness_color = LIGHT_COLOR_YELLOW

code/modules/power/lights/fixtures.dm

@@ -28,7 +28,7 @@
 	var/night_brightness_power = 0.3
 	var/supports_nightmode = TRUE
 	var/nightmode = FALSE
-	var/brightness_color = LIGHT_COLOR_HALOGEN
+	var/brightness_color = LIGHT_COLOR_OFFWHITE
 	/// Expected types defined in lightning.dm
 	var/status = LIGHT_OK
 	var/flickering = 0
@@ -62,7 +62,10 @@
 	var/previous_stat
 	var/randomize_color = TRUE
 	var/default_color
-	var/static/list/randomized_colors = LIGHT_STANDARD_COLORS
+	/// This is also defined at the area level! If you want to mess with
+	/// light fixture colours without touching specific subtypes, you
+	/// should probably be looking at the area's variables, not at this.
+	var/static/list/randomized_colors = LIGHT_WARM_COLORS
 	var/static/list/emergency_lights = list(
 		LIGHT_MODE_RED = LIGHT_COLOR_EMERGENCY,
 		LIGHT_MODE_DELTA = LIGHT_COLOR_ORANGE
@@ -132,8 +135,14 @@
 				if(prob(1) || (maybe_broken && prob(50)))
 					broken(1)
 
+	// If we're randomizing the color of this fixture, we check if the area has a special palette.
+	// This is intended to save mapping time by automating light variations in different areas.
 	if(randomize_color)
+		var/area/A = get_area(src)
+		randomized_colors = A.area_lighting
+
 		brightness_color = pick(randomized_colors)
+
 	default_color = brightness_color // We need a different var so the new color doesn't get wiped away. Initial() wouldn't work since brightness_color is overridden.
 	update(0)
 	set_pixel_offsets()