인터랙션 시스템 및 터널 기능 생성

Assets/Scripts/GameBase/BuildManager.cs

@@ -17,6 +17,8 @@ public class BuildManager : MonoBehaviour
         public Vector2Int size;            // 점유 칸수
     }
 
+    public bool IsBuildMode => isBuildMode;
+
     [Header("Settings")]
     [SerializeField] private float cellSize = 1f;
     [SerializeField] private LayerMask groundLayer;