[MIRROR] Fixes Luminescence actions [MDB IGNORE] (#19698)

* Fixes Luminescence actions (#73802)

## About The Pull Request

- Add Component was supposed to use a named arg, quick fix
- While testing the fix I noticed it doesn't properly remove the
appearance when the item is lost, cuts the overlay on failures

## Why It's Good For The Game

Mothblox said this broke things (it was making a weakref of a callback
on accident)

## Changelog

🆑 Melbert
fix: Luminsecent slime actions correctly update their appearance when
integrating or ejecting slime cores
/🆑

* Fixes Luminescence actions

---------

Co-authored-by: MrMelbert <51863163+MrMelbert@users.noreply.github.com>

code/datums/components/action_item_overlay.dm

@@ -15,6 +15,8 @@
 	if(!istype(parent, /datum/action))
 		return COMPONENT_INCOMPATIBLE
 
+	ASSERT(isnull(item) || istype(item))
+
 	if(!item && !item_callback)
 		stack_trace("[type] created without a reference item or an item callback - one or the other is required.")
 		return COMPONENT_INCOMPATIBLE
@@ -48,13 +50,17 @@
 	SIGNAL_HANDLER
 
 	// We're in the middle of being removed / deleted, remove our associated overlay
-	if(QDELING(src) && item_appearance)
-		current_button.cut_overlay(item_appearance)
-		item_appearance = null
+	if(QDELING(src))
+		if(item_appearance)
+			current_button.cut_overlay(item_appearance)
+			item_appearance = null
 		return
 
 	var/atom/movable/muse = item_callback?.Invoke() || item_ref?.resolve()
 	if(!istype(muse))
+		if(item_appearance) // New item does not exist but we have an old appearance
+			current_button.cut_overlay(item_appearance)
+			item_appearance = null
 		return
 
 	if(item_appearance)