Handle browser-blocked status checks

admin.js

@@ -217,17 +217,20 @@ async function probe(url) {
       signal: controller.signal
     });
     return {
-      ok: true,
+      status: 'online',
       ms: Math.round(performance.now() - started),
       detail: response.type === 'opaque'
         ? 'Erreichbar. HTTP-Details wegen Browser-CORS nicht lesbar.'
         : `HTTP ${response.status}`
     };
   } catch (error) {
+    const isTimeout = error.name === 'AbortError';
     return {
-      ok: false,
+      status: isTimeout ? 'offline' : 'unknown',
       ms: Math.round(performance.now() - started),
-      detail: error.name === 'AbortError' ? 'Timeout nach 6 Sekunden.' : error.message
+      detail: isTimeout
+        ? 'Timeout nach 6 Sekunden.'
+        : 'Der Browser blockiert diese Pruefung wahrscheinlich wegen CORS/CORB. Der Dienst kann trotzdem online sein.'
     };
   } finally {
     window.clearTimeout(timeout);
@@ -238,12 +241,20 @@ async function checkRow(row) {
   const service = config.services[Number(row.dataset.index)];
   const diagnostic = row.querySelector('.diagnostic');
   diagnostic.textContent = 'Pruefe...';
-  row.classList.remove('is-online', 'is-offline');
+  row.classList.remove('is-online', 'is-offline', 'is-unknown');
 
   const result = await probe(service.url);
-  row.classList.toggle('is-online', result.ok);
-  row.classList.toggle('is-offline', !result.ok);
-  diagnostic.textContent = `${result.ok ? 'Online' : 'Fehler'} - ${result.ms} ms - ${result.detail}`;
+  row.classList.toggle('is-online', result.status === 'online');
+  row.classList.toggle('is-offline', result.status === 'offline');
+  row.classList.toggle('is-unknown', result.status === 'unknown');
+
+  const label = {
+    online: 'Online',
+    offline: 'Fehler',
+    unknown: 'Nicht im Browser pruefbar'
+  }[result.status];
+
+  diagnostic.textContent = `${label} - ${result.ms} ms - ${result.detail}`;
 }
 
 function saveLocal() {
@@ -315,4 +326,3 @@ downloadConfigButton.addEventListener('click', downloadConfig);
 boot().catch((error) => {
   loginMessage.textContent = `Adminseite konnte nicht starten: ${error.message}`;
 });
-