feat: adopt material 3 theme and billing adjustments

lib/widgets/animated_page_transitions.dart

@@ -130,9 +130,11 @@ class RotatePageRoute<T> extends PageRouteBuilder<T> {
               alignment: Alignment.center,
               transform: Matrix4.identity()
                 ..setEntry(3, 2, 0.001)
-                ..rotateZ(rotateAnimation.value)
-                ..scale(scaleAnimation.value),
-              child: child,
+                ..rotateZ(rotateAnimation.value),
+              child: Transform.scale(
+                scale: scaleAnimation.value,
+                child: child,
+              ),
             );
           },
         );
@@ -219,7 +221,10 @@ class ContainerTransformPageRoute<T> extends PageRouteBuilder<T> {
                 FadeTransition(
                   opacity: animation,
                   child: Container(
-                    color: Colors.black.withValues(alpha: 0.3),
+                    color: Theme.of(context)
+                        .colorScheme
+                        .scrim
+                        .withValues(alpha: 0.3),
                   ),
                 ),
                 // 컨테이너 확장 애니메이션