Add a native SwiftUI macOS app that shares the iOS player.

The GTK Mac build stays; CI now also publishes maturita-macos-swift.

Co-authored-by: Cursor <cursoragent@cursor.com>

macos/Maturita/Platform.swift

@@ -0,0 +1,38 @@
+#if os(macOS)
+import AppKit
+import SwiftUI
+
+extension NSColor {
+    static var tertiarySystemFill: NSColor {
+        NSColor.quaternaryLabelColor.withAlphaComponent(0.16)
+    }
+
+    static var secondarySystemGroupedBackground: NSColor {
+        .controlBackgroundColor
+    }
+
+    static var separator: NSColor { .separatorColor }
+}
+
+enum TextInputAutocapitalization {
+    case never
+}
+
+enum UIKeyboardType {
+    case decimalPad
+}
+
+enum MacNavBarTitleMode {
+    case large
+    case inline
+}
+
+extension View {
+    func textInputAutocapitalization(_ style: TextInputAutocapitalization) -> some View { self }
+
+    func keyboardType(_ type: UIKeyboardType) -> some View { self }
+
+    func navigationBarTitleDisplayMode(_ mode: MacNavBarTitleMode) -> some View { self }
+}
+
+#endif