Begin, the Lag Wars Have (#21839)

<img width="700" height="848" alt="image"
src="https://github.com/user-attachments/assets/e0db50af-35db-43c7-b78e-6c1ea5ac569c"
/>

you take a tiny little two year LOA and this happens
this PR hits some large lag culprits:
- UpdateOverlays() getting spammed by human/update_icon. This was 0.85%
of server CPU time during the event. Doesn't sound like a whole lot but
it's insane. 99% of it was caused by sloppy duplicate calls of
update_icon in set_dir (as well as update icon itself!). Refactored to
stop that
- Makes Follow menu update manually, which cuts down on the 2.8 million
REF() calls it made during the event. This was ~1% of CPU time including
ui_data as well.
- Gets rid of a bunch of random runtimes and some lighting-related
harddels.
- NanoUIs now clean themselves up when their owner qdels rather than
forcing the owner to do REF(src) and close all matching UIs. saves us
~0.1% server cpu time! wowza!

code/modules/organs/subtypes/standard.dm

@@ -194,12 +194,11 @@
 
 /obj/item/organ/external/hand/is_malfunctioning()
 	. = ..()
-	if(!.)
-		if(owner.is_mechanical())
-			var/actuator_type = limb_name == BP_L_HAND ? BP_ACTUATORS_LEFT : BP_ACTUATORS_RIGHT
-			var/obj/item/organ/internal/machine/actuators/actuator = owner.internal_organs_by_name[actuator_type]
-			if(!actuator || (actuator.status & ORGAN_DEAD))
-				return TRUE
+	if(!. && owner?.is_mechanical())
+		var/actuator_type = limb_name == BP_L_HAND ? BP_ACTUATORS_LEFT : BP_ACTUATORS_RIGHT
+		var/obj/item/organ/internal/machine/actuators/actuator = owner.internal_organs_by_name[actuator_type]
+		if(!actuator || (actuator.status & ORGAN_DEAD))
+			return TRUE
 
 /obj/item/organ/external/hand/take_damage(brute, burn, damage_flags, used_weapon, list/forbidden_limbs, silent)
 	. = ..()