inventory refactor + inv ui interactable

gui/game/inventory_gui/inventory_item/scripts/inventory_gui_item.gd

@@ -3,6 +3,7 @@ class_name InventoryGuiItem
 
 @export var no_item_texture_path : Texture2D
 
+signal item_clicked()
 
 const MODULATE_INSPECTED_COLOR = Color.GRAY
 
@@ -25,6 +26,10 @@ func _on_mouse_excited():
 	if current_item:
 		Pointer.stop_inspect(self)
 
+func _on_gui_input(_event: InputEvent) -> void:
+	if Input.is_action_just_pressed("action"):
+		emit_signal("item_clicked")
+
 func inspector_info() -> Inspector.Info:
 	return current_item.inspector_info()