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

frontend/src/views/AdminShuttles.vue

@@ -4,6 +4,8 @@ import { useRouter } from 'vue-router';
 import { SUPABASE_URL } from '@/supabase';
 import axios from 'axios';
 
+const API_URL = import.meta.env.VITE_API_URL || 'http://localhost:8000';
+
 const router = useRouter();
 const isLoading = ref(false);
 const showMessage = ref({ text: '', type: '' });
@@ -524,6 +526,15 @@ async function saveShuttle() {
   background: #101820;
 }
 
+.shuttle-card-bg {
+  position: absolute;
+  inset: 0;
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+  z-index: 0;
+}
+
 .shuttle-card-preview::before {
   content: "";
   position: absolute;