fix: card_board was unable to return a solid Array[Draggable]

src/base-environments/transition/code/subway_train.gd

@@ -19,4 +19,3 @@ func set_line(line : StringName):
 	$TrainModel/traun_hull.material_overlay = materials[line]
 	$TrainModel/LineLabelBack.text = line.to_upper()
 	$TrainModel/LineLabelFront.text = line.to_upper()
-		

src/logic-scenes/board/card-board.gd

@@ -545,15 +545,22 @@ var dropzone_size: Vector2:
 var _selection_candidates : Array[Draggable]:
 	get:
 		match selection_state:
-			SelectionState.CARDS: return cards as Array[Draggable]
-			SelectionState.STICKIES: return notes as Array[Draggable]
+			SelectionState.CARDS:
+				return as_draggable(cards)
+			SelectionState.STICKIES:
+				return as_draggable(notes)
 			SelectionState.FREE:
 				print("switching from free selection to guided stickies selection")
 
 		# Otherwise default to sticky selection
 		selection_state = SelectionState.STICKIES
-		return notes as Array[Draggable]
+		return as_draggable(notes)
 
+func as_draggable(items : Array) -> Array[Draggable]:
+	var result : Array[Draggable] = []
+	for item in items:
+		result.append(item)
+	return result
 
 # === Util ===