fix PlatformColor resolves to incorrect color in some appearances

Sources/CyanExtensions/NSAppearance+Extension.swift

@@ -0,0 +1,27 @@
+//
+//  Created by Cyandev on 2022/3/31.
+//  Copyright (c) 2021 Cyandev. All rights reserved.
+//
+
+#if canImport(AppKit)
+import AppKit
+
+public enum UserInterfaceStyle {
+    case light
+    case dark
+}
+
+public extension NSAppearance {
+
+    var userInterfaceStyle: UserInterfaceStyle {
+        if name == Name.darkAqua ||
+            name == Name.vibrantDark ||
+            name == Name.accessibilityHighContrastDarkAqua ||
+            name == Name.accessibilityHighContrastVibrantDark {
+            return .dark
+        }
+        return .light
+    }
+
+}
+#endif

Sources/CyanExtensions/PlatformColor+Extension.swift

@@ -44,7 +44,7 @@ public extension PlatformColor {
 
     convenience init(lightColor: PlatformColor, darkColor: PlatformColor) {
         self.init(name: nil, dynamicProvider: { appearance in
-            if appearance.name == .darkAqua {
+            if appearance.userInterfaceStyle == .dark {
                 return darkColor
             } else {
                 return lightColor