Get macOS 26+ icon tint color

tintColor.swift

struct AppearanceTintColor {
    @objc protocol IconAppearanceConfiguring {
        var iconAppearanceTheme: UInt32 { get }
        var iconTintColorName: UInt32 { get }
        var otherIconTintColor: CGColor? { get }
        var resolvedIconTintColor: NSColor? { get }
    }

    func config() -> IconAppearanceConfiguring? {
        let workspace = NSWorkspace.shared as NSObject
        let key = "currentIconAppearanceConfiguration"
        guard workspace.responds(to: NSSelectorFromString(key)) else { return nil }

        return unsafeBitCast(workspace.value(forKey: key) as AnyObject?, to: IconAppearanceConfiguring?.self)
    }

}