fix(@vant/cli): add passive for global touchstart (#10979)

packages/vant-cli/site/mobile/main.js

@@ -13,3 +13,8 @@ window.app = createApp(App)
 setTimeout(() => {
   window.app.mount('#app');
 }, 0);
+
+// https://stackoverflow.com/questions/3885018/active-pseudo-class-doesnt-work-in-mobile-safari/33681490#33681490
+document.addEventListener('touchstart', () => {}, {
+  passive: true,
+});