Some improvements

ui/hand.gd

@@ -0,0 +1,27 @@
+@tool
+extends Control
+
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(_delta: float) -> void:
+	var calculated_size: Vector2 = Vector2.ZERO
+	
+	for card: Card in get_children():
+		calculated_size += card.get_rect().size
+	
+	calculated_size.y /= get_child_count()
+	
+	var offset: float = 0.
+	for i in range(get_child_count()):
+		var card:Card = get_child(i)
+		offset += card.get_rect().size.x
+		if card.top_level:
+			continue
+		
+		var calculated_position: Vector2 = get_combined_pivot_offset() - calculated_size * Vector2(1.-1./get_child_count(),1) + Vector2.RIGHT*offset
+		
+		card.position = lerp(card.position,calculated_position,0.25)
+
+func resort_by_position():
+	var children: Array = get_children()

ui/hand.gd.uid

@@ -0,0 +1 @@
+uid://caf4h6lok18so