Add iOS 16+ version check for MultitaskingCameraAccess API

[Copilot]

The MultitaskingCameraAccessSupported and MultitaskingCameraAccessEnabled properties are only available on iOS 16+. Accessing them on iOS 15 causes runtime crashes.

Changes

• Wrapped MultitaskingCameraAccess API calls with OperatingSystem.IsIOSVersionAtLeast(16) guard in CameraManager.ios.maccatalyst.cs

#if IOS
if (OperatingSystem.IsIOSVersionAtLeast(16))
{
    if (captureSession.MultitaskingCameraAccessSupported)
    {
        captureSession.BeginConfiguration();
        captureSession.MultitaskingCameraAccessEnabled = true;
        captureSession.CommitConfiguration();
    }
}
#endif

This preserves the iPadOS Windowed Apps mode fix for iOS 16+ while maintaining compatibility with iOS 15 devices.

Warning

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I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/Redth/ZXing.Net.Maui/issues/288/comments
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Original prompt

Can you have a look at this comment and add the needed check #288 (comment)

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[Copilot]

Pull request overview

This PR adds an iOS version check to prevent runtime crashes on iOS 15 devices when accessing the MultitaskingCameraAccess API, which is only available on iOS 16+.

Key Changes:

• Wrapped MultitaskingCameraAccess API calls with OperatingSystem.IsIOSVersionAtLeast(16) guard to ensure compatibility with iOS 15 devices while preserving iPadOS Windowed Apps mode functionality for iOS 16+.

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