Add viewer_state for TGUI, an observational state (#22860)

* I like to watch

* Wires are secondary

code/game/gamemodes/nuclear/nuclearbomb.dm

@@ -334,7 +334,10 @@ GLOBAL_VAR(bomb_set)
 	update_icon(UPDATE_OVERLAYS)
 
 /obj/machinery/nuclearbomb/attack_ghost(mob/user as mob)
-	attack_hand(user)
+	if(!panel_open)
+		return ui_interact(user, state = GLOB.viewer_state)
+	if(removal_stage != NUKE_CORE_FULLY_EXPOSED || !core)
+		return wires.Interact(user)
 
 /obj/machinery/nuclearbomb/attack_hand(mob/user as mob)
 	if(!panel_open)

code/modules/tgui/states/viewer_state.dm

@@ -0,0 +1,10 @@
+/**
+ * tgui state: viewer_state
+ *
+ * State for only viewing, regardless of distance. Different from observer_state, which grants interactivity exclusively if an observer/admin.
+ */
+
+GLOBAL_DATUM_INIT(viewer_state, /datum/ui_state/viewer_state, new)
+
+/datum/ui_state/viewer_state/can_use_topic(src_object, mob/user)
+	return STATUS_UPDATE

paradise.dme

@@ -2734,6 +2734,7 @@
 #include "code\modules\tgui\states\observer_state.dm"
 #include "code\modules\tgui\states\physical.dm"
 #include "code\modules\tgui\states\self.dm"
+#include "code\modules\tgui\states\viewer_state.dm"
 #include "code\modules\tgui\states\zlevel_state.dm"
 #include "code\modules\tooltip\tooltip.dm"
 #include "code\modules\unit_tests\_unit_tests.dm"