Create room 046 (Tower Stairway) and wire to room 045

- Added kq4_046_tower_stairway scene
- South exit to room 045 (Genesta's Bed Chamber) - bidirectional connection
- North exit to room 047 (Tower Chamber) - room 047 doesn't exist yet, transition pending
- Updated room 045 to add return transition to room 046

scenes/kq4_045_genestas_bed_chamber/kq4_045_genestas_bed_chamber.tscn

@@ -41,7 +41,7 @@ position = Vector2(194, 819)
 position = Vector2(1766, 74)
 polygon = PackedVector2Array(-108, 454, -87, 649, 376, 658, 348, 381)
 appear_at_node = "kq4_045_genestas_bed_chamber"
-target = "uid://PLACEHOLDER_046"
+target = "uid://w801ak6vzoh4"
 label = "Genesta's Tower"
 
 [node name="entrance" parent="kq4_046_genestas_tower" index="0"]