update

frontend/src/components/TopicDetail.vue

@@ -48,6 +48,7 @@ const CH_COLORS = ['#3b82f6', '#8b5cf6', '#14b8a6', '#f59e0b', '#22c55e', '#6366
 
 // --- Inhalt laden ---
 const content = ref(null)
+const loadError = ref(null)
 const doneChapters = ref(new Set())
 const scrollEl = ref(null)
 
@@ -55,6 +56,7 @@ watch(() => props.previewGuide?.id, loadContent, { immediate: true })
 
 async function loadContent() {
   content.value = null
+  loadError.value = null
   doneChapters.value = new Set()
   const g = props.previewGuide
   if (!g || g.status !== 'done') return
@@ -62,6 +64,7 @@ async function loadContent() {
     content.value = await fetchGuideContent(g.id)
   } catch (e) {
     console.error('Fehler beim Laden des Guides:', e)
+    loadError.value = 'Inhalt nicht verfügbar — die Datei fehlt. Guide neu generieren (▶).'
     return
   }
   try {
@@ -236,7 +239,7 @@ async function send() {
     </div>
 
     <div v-else-if="previewGuide" class="empty-preview">
-      <p>Lade Inhalt…</p>
+      <p>{{ loadError || 'Lade Inhalt…' }}</p>
     </div>
 
     <div class="empty-preview" v-else>