Bugfixes - Slowdowns, Sofa spinning, Turbolift squishing, and more (#22043)

Fixes https://github.com/Aurorastation/Aurora.3/issues/21669
Fixes https://github.com/Aurorastation/Aurora.3/issues/21951
Fixes https://github.com/Aurorastation/Aurora.3/issues/21972
Fixes https://github.com/Aurorastation/Aurora.3/issues/22077

changes:
- bugfix: "All movespeed_modifier slowdown data now applied correctly
post-smooth movement PR. IE: active magboots, duffel bags, etc. again
slow you down."
  - bugfix: "Sofas no longer able to be rotated while anchored."
- bugfix: "Attempting to use crowbars, fire axes, hammers on airlocks
while in the Hurt intent will now make you attack the airlock."
- bugfix: "Fixes graphical bug with open lid graphics for crates painted
in any engineering color variants."
- bugfix: "Individual butterfly knife parts are no longer larger than
butterfly knives themselves."
- bugfix: "Elevators that squish mobs (any type of mob/living) will now
appropriately gib instead of just quietly deleting them."
- rscadd: "Miniature fusion reactor explosions now use subsystem
radiation instead of manually applying rad damage to all mobs in range."

code/game/objects/items/weapons/improvised_components.dm

@@ -3,6 +3,7 @@
 	desc = "An unfinished concealed knife, it looks like the screws need to be tightened."
 	icon = 'icons/obj/weapons_build.dmi'
 	icon_state = "butterflystep1"
+	w_class = WEIGHT_CLASS_SMALL
 	force_divisor = 0.1
 	thrown_force_divisor = 0.1
 
@@ -18,6 +19,7 @@
 	desc = "A knife blade. Unusable as a weapon without a grip."
 	icon = 'icons/obj/weapons_build.dmi'
 	icon_state = "butterfly2"
+	w_class = WEIGHT_CLASS_SMALL
 	force_divisor = 0.1
 	thrown_force_divisor = 0.1
 
@@ -26,6 +28,7 @@
 	desc = "A plasteel grip with screw fittings for a blade."
 	icon = 'icons/obj/weapons_build.dmi'
 	icon_state = "butterfly1"
+	w_class = WEIGHT_CLASS_SMALL
 	force_divisor = 0.1
 	thrown_force_divisor = 0.1