[FIX] hitTest iOS18 이슈 수정 (#150)

- https://forums.developer.apple.com/forums/thread/762292

Projects/Shared/CommonFeature/Sources/DesignSystem/Views/Alert/PassThroughWindow.swift

@@ -9,8 +9,23 @@
 import SwiftUI
 
 final class PassThroughWindow: UIWindow {
-  override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
-    guard let hitView = super.hitTest(point, with: event) else { return nil }
-    return rootViewController?.view == hitView ? nil : hitView
-  }
+    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
+        guard let hitView = super.hitTest(point, with: event),
+              let rootView = rootViewController?.view
+        else {
+            return nil
+        }
+
+        if #available(iOS 18, *) {
+            for subview in rootView.subviews.reversed() {
+                let convertedPoint = subview.convert(point, from: rootView)
+                if subview.hitTest(convertedPoint, with: event) != nil {
+                    return hitView
+                }
+            }
+            return nil
+        } else {
+            return hitView == rootView ? nil : hitView
+        }
+    }
 }