Handle browser-blocked status checks

app.js

@@ -154,13 +154,19 @@ async function probeService(card) {
     });
     card.classList.add('is-online');
     card.classList.remove('is-offline');
+    card.classList.remove('is-unknown');
     card.querySelector('.status-dot').setAttribute('aria-label', 'Online');
     return true;
-  } catch {
-    card.classList.add('is-offline');
+  } catch (error) {
+    const isTimeout = error.name === 'AbortError';
+    card.classList.toggle('is-offline', isTimeout);
+    card.classList.toggle('is-unknown', !isTimeout);
     card.classList.remove('is-online');
-    card.querySelector('.status-dot').setAttribute('aria-label', 'Nicht erreichbar');
-    return false;
+    card.querySelector('.status-dot').setAttribute(
+      'aria-label',
+      isTimeout ? 'Nicht erreichbar' : 'Im Browser nicht pruefbar'
+    );
+    return isTimeout ? false : null;
   } finally {
     window.clearTimeout(timeout);
   }
@@ -169,11 +175,12 @@ async function probeService(card) {
 async function refreshStatus() {
   const results = await Promise.allSettled(cards.map(probeService));
   const online = results.filter((result) => result.status === 'fulfilled' && result.value).length;
+  const unknown = results.filter((result) => result.status === 'fulfilled' && result.value === null).length;
   onlineCount.textContent = String(online);
   lastChecked.textContent = `Status geprueft: ${new Date().toLocaleTimeString('de-DE', {
     hour: '2-digit',
     minute: '2-digit'
-  })}`;
+  })}${unknown ? `, ${unknown} im Browser nicht pruefbar` : ''}`;
 }
 
 function scheduleStatusRefresh() {