Adds tgui color picker (#94313)

## About The Pull Request

Ports https://github.com/Monkestation/Monkestation2.0/pull/1231 which is
a port of https://github.com/BeeStation/BeeStation-Hornet/pull/9417
which is a port of https://github.com/omgovich/react-colorful/
Also a port of
https://github.com/effigy-se/effigy/blob/main/tgui/packages/tgui/interfaces/effigy/ColorPickerModal.tsx
for hex color presets

Admin stuff got excluded (pref-like picker, filterrific, get-variables)



https://github.com/user-attachments/assets/7069bef9-81cd-4636-bf68-cbad227ef09e


## Why It's Good For The Game

It's one of the only input areas that still doesn't use TGUI, leaving
darkmode players flashbanged every single time a color selection UI is
opened. This is also just visually great and I think a big upgrade from
byond's.

## Changelog

🆑 omgovich, itsmeow, Absolucy, JohnFulpWillard, jlsnow301, TealSeer,
lessthnthree
add: Color selection panels now use TGUI (If you have TGUI enabled in
settings).
/🆑

code/modules/admin/greyscale_modify_menu.dm

@@ -166,12 +166,12 @@
 
 		if("pick_color")
 			var/group = params["color_index"]
-			var/new_color = input(
+			var/new_color = tgui_color_picker(
 				usr,
 				"Choose color for greyscale color group [group]:",
 				"Greyscale Modification Menu",
 				split_colors[group]
-			) as color|null
+			)
 			if(new_color)
 				split_colors[group] = new_color
 				queue_refresh()

code/modules/admin/verbs/light_debug.dm

@@ -256,7 +256,7 @@ GLOBAL_LIST_EMPTY(light_debugged_atoms)
 		if("set_on")
 			parent.set_light(l_on = params["value"])
 		if("change_color")
-			var/chosen_color = input(ui.user, "Pick new color", "[parent]", parent.light_color) as color|null
+			var/chosen_color = tgui_color_picker(ui.user, "Pick new color", "[parent]", parent.light_color)
 			if(chosen_color)
 				parent.set_light(l_color = chosen_color)
 		if("set_power")