fix(ios): isolate ARKit sources to iOS builds

Author: ruvnet

ui/ios-nlos/Sources/RuViewNLOSApple/AppleCapabilityProbe.swift

@@ -1,7 +1,7 @@
 import Foundation
 import RuViewNLOSCore
 
-#if canImport(ARKit)
+#if os(iOS) && canImport(ARKit)
 import ARKit
 #endif
 
@@ -49,7 +49,7 @@ public extension AppleNLOSCapabilityReport {
 
 public enum AppleCapabilityProbe {
     public static func probe() -> AppleNLOSCapabilityReport {
-        #if canImport(ARKit)
+        #if os(iOS) && canImport(ARKit)
         let sceneDepth = ARWorldTrackingConfiguration.supportsFrameSemantics(.sceneDepth)
         let smoothedDepth = ARWorldTrackingConfiguration.supportsFrameSemantics(.smoothedSceneDepth)
         let mesh = ARWorldTrackingConfiguration.supportsSceneReconstruction(.mesh)

ui/ios-nlos/Sources/RuViewNLOSApple/VisibleDepthValidationSession.swift

@@ -1,7 +1,7 @@
 import Foundation
 import RuViewNLOSCore
 
-#if canImport(ARKit) && canImport(AVFoundation) && canImport(Combine)
+#if os(iOS) && canImport(ARKit) && canImport(AVFoundation) && canImport(Combine)
 @preconcurrency import ARKit
 @preconcurrency import AVFoundation
 import Combine

ui/ios-nlos/Tests/RuViewNLOSAppleTests/AppleCapabilityProbeTests.swift

@@ -28,7 +28,7 @@ final class AppleCapabilityProbeTests: XCTestCase {
         XCTAssertFalse(flags.rawPhotonHistograms)
     }
 
-    #if !canImport(ARKit)
+    #if !os(iOS) || !canImport(ARKit)
     func testNonAppleBuildHostReportsARKitSignalsUnavailable() {
         let report = AppleCapabilityProbe.probe()