Add backend error logging and increase frontend timeout

frontend/src/views/AdminRoutes.vue

@@ -354,7 +354,12 @@ async function confirmCreateRoute() {
         isCreating.value = false
     } catch (err: any) {
         console.error('Error creating route:', err)
-        alert('No se pudo crear la ruta: ' + (err.response?.data?.detail || err.message))
+        const errorMsg = err.response?.data?.detail 
+            || err.response?.data?.message 
+            || err.message 
+            || 'Error desconocido'
+        const errorDetail = err.response ? `Status: ${err.response.status}` : 'No hubo respuesta del servidor (Network Error)'
+        alert(`No se pudo crear la ruta: ${errorMsg}\n\nDetalle: ${errorDetail}`)
     }
 }
 

frontend/src/views/AdminShuttles.vue

@@ -209,7 +209,8 @@ async function saveShuttle() {
           <h2>Previsualización en Directo</h2>
         </div>
 
-          <!-- PREVIEW PANEL -->
+        <div class="preview-container">
+          <!-- PREVIEW CARD -->
           <div class="shuttle-card-preview" :class="{ expanded: true }" :style="{ backgroundImage: `url(${previewImageUrl})` }">
             <div class="shuttle-main-info">
               <div class="shuttle-header-mini">