Mobility refactor: UI, pull and lying down edition (#54078)

code/game/objects/buckling.dm

@@ -1,6 +1,7 @@
 /atom/movable
 	var/can_buckle = FALSE
-	var/buckle_lying = -1 //bed-like behaviour, forces mob.lying = buckle_lying if != -1
+	/// Bed-like behaviour, forces mob.lying = buckle_lying if not set to [NO_BUCKLE_LYING].
+	var/buckle_lying = NO_BUCKLE_LYING
 	var/buckle_requires_restraints = FALSE //require people to be handcuffed before being able to buckle. eg: pipes
 	var/list/mob/living/buckled_mobs = null //list()
 	var/max_buckled_mobs = 1

code/game/objects/structures/manned_turret.dm

@@ -9,7 +9,7 @@
 	anchored = FALSE
 	density = TRUE
 	max_integrity = 100
-	buckle_lying = FALSE
+	buckle_lying = 0
 	layer = ABOVE_MOB_LAYER
 	var/view_range = 2.5
 	var/cooldown = 0

code/game/objects/structures/tables_racks.dm

@@ -552,7 +552,7 @@
 	smoothing_groups = null
 	canSmoothWith = null
 	can_buckle = 1
-	buckle_lying = -1
+	buckle_lying = NO_BUCKLE_LYING
 	buckle_requires_restraints = TRUE
 	var/mob/living/carbon/human/patient = null
 	var/obj/machinery/computer/operating/computer = null

code/game/objects/structures/target_stake.dm

@@ -7,7 +7,7 @@
 	flags_1 = CONDUCT_1
 	can_buckle = TRUE
 	max_buckled_mobs = 1
-	buckle_lying = FALSE
+	buckle_lying = 0
 	var/obj/item/target/pinned_target
 
 /obj/structure/target_stake/Destroy()