remove page flash due to LazyPage.html (#120)

routes/_components/LazyPage.html

@@ -2,8 +2,17 @@
   <:Component {pageComponent} :params />
 {{/if}}
 <script>
+  // On the very first page load, avoid doing a "reveal" because
+  // it leads to a flash between when the SSR is shown, the two frame we hide it,
+  // and then when we show it again.
+  //
+  // We only really need LazyPage behavior when the user is clicking around
+  // after the page has loaded, to improve input responsiveness.
+  let firstTime = true
+
   export default {
     oncreate() {
+      firstTime = false
       requestAnimationFrame(() => {
         requestAnimationFrame(() => {
           this.set({revealed: true})
@@ -11,7 +20,7 @@
       })
     },
     data: () => ({
-      revealed: !process.browser
+      revealed: !process.browser || firstTime
     })
   }
 </script>