fix: API_URL not defined in shuttle/admin views + fix shuttle card image display

frontend/src/views/FavoritesView.vue

@@ -5,6 +5,8 @@ import { useI18n } from 'vue-i18n'
 import { useFavoritesStore } from '@/stores/favorites'
 import { SUPABASE_URL } from '@/supabase'
 
+const API_URL = import.meta.env.VITE_API_URL || 'http://localhost:8000';
+
 const { t } = useI18n()
 const router = useRouter()
 const favoritesStore = useFavoritesStore()