feat(home): don't fade from white if nds was already booted

app/components/Home/TopScreen/Background.vue

@@ -1,13 +1,13 @@
 <script setup lang="ts">
 const store = useHomeStore();
+const app = useAppStore();
 
 const backgroundImage = useTemplateRef("backgroundImage");
 
 useRender((ctx) => {
   if (!backgroundImage.value) return;
 
-  ctx.globalAlpha = store.intro.stage1Opacity;
-
+  ctx.globalAlpha = app.booted ? 1 : store.intro.stage1Opacity;
   ctx.drawImage(backgroundImage.value, 0, 0);
 });
 </script>