esc(Cancel)로 건설모드 취소

Assets/Scripts/BuildingQuickslotUI.cs

@@ -29,6 +29,7 @@ namespace Northbound
         private List<BuildingSlotButton> slotButtons = new List<BuildingSlotButton>();
         private BuildingPlacement buildingPlacement;
         private int currentSelectedIndex = -1;
+        private int lastSelectedIndex = 0;
         private PlayerInputActions _inputActions;
         private InputAction[] _quickslotActions;
 
@@ -234,8 +235,12 @@ namespace Northbound
             // 퀵슬롯 입력 활성화
             EnableQuickslotActions(true);
 
-            // 기본 선택 (첫 번째 건물)
-            if (slotButtons.Count > 0)
+            // 마지막으로 선택된 건물 선택
+            if (slotButtons.Count > 0 && lastSelectedIndex >= 0 && lastSelectedIndex < slotButtons.Count)
+            {
+                SelectBuilding(lastSelectedIndex);
+            }
+            else if (slotButtons.Count > 0)
             {
                 SelectBuilding(0);
             }
@@ -286,6 +291,7 @@ namespace Northbound
 
             // 새로운 선택
             currentSelectedIndex = index;
+            lastSelectedIndex = index;
             slotButtons[index].SetSelected(true);
 
             // BuildingPlacement에 알림