Adds a crew monitor for observers (#24118)

* wheee

* ignoring sensors now actually gets all health info

* a

* this wasn't supposed to go here

* delete observer menu on mob del

* erm

* global on my datum

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Co-authored-by: github-actions <github-actions@github.com>

code/modules/mob/dead/observer/observer_base.dm

@@ -5,6 +5,8 @@ GLOBAL_LIST_EMPTY(ghost_images)
 
 GLOBAL_VAR_INIT(observer_default_invisibility, INVISIBILITY_OBSERVER)
 
+GLOBAL_DATUM_INIT(ghost_crew_monitor, /datum/ui_module/crew_monitor/ghost, new)
+
 /mob/dead/observer
 	name = "ghost"
 	desc = "It's a g-g-g-g-ghooooost!" //jinkies!
@@ -477,6 +479,13 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 
 	orbit_menu.ui_interact(src)
 
+/mob/dead/observer/verb/crew_monitor()
+	set category = "Ghost"
+	set name = "Crew Monitor"
+	set desc = "Use a ghastly crew monitor that lets you follow people you select."
+
+	GLOB.ghost_crew_monitor.ui_interact(src)
+
 /mob/dead/observer/proc/add_observer_verbs()
 	verbs.Add(/mob/dead/observer/proc/ManualFollow)