Metastation kitchen area redesign and related features, take 2 (#30754)

* Metastation kitchen area redesign and related features, take 2

* reviews

code/datums/elements/shelf_positioning.dm

@@ -0,0 +1,32 @@
+/// Shelf positioning allows for custom positioning on shelves for individual items.
+/datum/element/shelf_positioning
+	element_flags = ELEMENT_BESPOKE
+	argument_hash_start_idx = 2
+	var/x_offset
+	var/y_offset
+	var/scale
+	var/rotation
+
+// Allow for custom offsets, scales, and rotations for specific items
+// when added to a shelf.
+/datum/element/shelf_positioning/Attach(datum/target, x_offset_ = 0, y_offset_ = 0, scale_ = 0, rotation_ = 0)
+	. = ..()
+
+	if(!isitem(target))
+		return ELEMENT_INCOMPATIBLE
+
+	x_offset = x_offset_
+	y_offset = y_offset_
+	scale = scale_
+	rotation = rotation_
+
+	RegisterSignal(target, COMSIG_SHELF_ITEM_ADDED, PROC_REF(on_shelf_item_added))
+
+/datum/element/shelf_positioning/proc/on_shelf_item_added(obj/item/target, default_scale)
+	SIGNAL_HANDLER // COMSIG_SHELF_ITEM_ADDED
+	target.pixel_x += x_offset
+	target.pixel_y += y_offset
+	if(rotation)
+		target.transform = turn(target.transform, rotation)
+	if((!default_scale) && scale)
+		target.transform *= scale