feat(home): play the white -> background fade only once

NOTE: it's not correctly done, i'm using app state for that, i might move to intro but it's fine for now

app/stores/app.ts

@@ -28,6 +28,8 @@ export const useAppStore = defineStore("app", {
 
     return {
       booted: false,
+      // shitty but who cares
+      homeIntroPlayed: false,
       settings,
       screen: "home" as AppScreen,
       camera: null as THREE.Camera | null,