fix: cloud folder views use same background as cloud main tab

Cloud subpages (Music, Photos, etc.) now show bg-cloud.jpg instead
of falling through to bg-home.jpg.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

neode-ui/src/views/Dashboard.vue

@@ -167,6 +167,8 @@ const isGlitching = ref(false)
 const backgroundImage = computed(() => {
   const mapped = ROUTE_BACKGROUNDS[route.path]
   if (mapped) return mapped
+  // Cloud subpages (folders) use the same background as Cloud
+  if (route.path.startsWith('/dashboard/cloud/')) return 'bg-cloud.jpg'
   if (isDetailRoute(route.path)) return 'bg-intro.jpg'
   return 'bg-home.jpg'
 })