refactor: remove cardTransparent in favor of cardStyle

packages/stack/example/src/DragLimitedToModal.tsx

@@ -14,9 +14,9 @@ const DragLimitedToModal: NavigationStackScreenComponent = () => (
 );
 
 DragLimitedToModal.navigationOptions = {
+  cardStyle: { backgroundColor: 'transparent' },
   gestureDirection: 'vertical',
   gestureResponseDistance: { vertical: HEIGHT },
-  cardTransparent: true,
   cardStyleInterpolator: ({ current }) => {
     const translateY = interpolate(current.progress, {
       inputRange: [0, 1],

packages/stack/example/src/PerScreenTransitions.tsx

@@ -114,9 +114,9 @@ export default createStackNavigator(
     Transparent: {
       screen: TransparentScreen,
       navigationOptions: {
+        cardStyle: { backgroundColor: 'transparent' },
         headerShown: false,
         gestureEnabled: false,
-        cardTransparent: true,
         transitionSpec: {
           open: TransitionSpecs.TransitionIOSSpec,
           close: TransitionSpecs.TransitionIOSSpec,

packages/stack/example/src/TransparentStack.tsx

@@ -72,8 +72,8 @@ export default createStackNavigator(
     mode: 'modal',
     headerMode: 'none',
     defaultNavigationOptions: {
+      cardStyle: { backgroundColor: 'transparent' },
       gestureEnabled: false,
-      cardTransparent: true,
       cardStyleInterpolator: ({ current: { progress } }) => {
         const opacity = Animated.interpolate(progress, {
           inputRange: [0, 0.5, 0.9, 1],