fix: add error handling for fetch response in internship edit page

frontend/app/pages/dashboard/student/internship/edit/[id].vue

@@ -20,7 +20,7 @@ const client = useSanctumClient();
 const loading = ref(false);
 const action_error = ref(null as null | string);
 
-const { data, refresh } = await useSanctumFetch<Internship>(`/api/internships/${route.params.id}`);
+const { data, error, refresh } = await useSanctumFetch<Internship>(`/api/internships/${route.params.id}`);
 
 async function handleUpdateOfBasicInfo(internship: NewInternship) {
     action_error.value = null;
@@ -57,6 +57,10 @@ async function handleUpdateOfBasicInfo(internship: NewInternship) {
             <!-- Chybová hláška -->
             <ErrorAlert v-if="action_error" :error="action_error" />
 
+            <!-- Chybová hláška -->
+            <ErrorAlert v-if="error" :error="error.message" />
+
+            <div v-else>
                 <div>
                     <h2>Základné informácie</h2>
                     <ErrorAlert v-if="data?.status.status !== InternshipStatus.SUBMITTED"
@@ -89,6 +93,7 @@ async function handleUpdateOfBasicInfo(internship: NewInternship) {
 
                     <InternshipDocumentEditor v-else :internship="data!" @successful-submit="refresh" />
                 </div>
+            </div>
         </v-card>
     </v-container>
 </template>