fix v3

Server/src/App.jsx

@@ -34,8 +34,12 @@ function isCorsOrNetworkError(e) {
   return (
     msg.includes("failed to fetch") ||
     msg.includes("network error") ||
+    msg.includes("network request failed") ||
     msg.includes("networkrequestfailed") ||
-    (e?.name && e.name.toLowerCase().includes("network"))
+    msg.includes("load failed") ||
+    msg.includes("err_failed") ||
+    (e?.name && e.name.toLowerCase().includes("network")) ||
+    (e?.type === "error" && !msg)
   );
 }
 
@@ -540,6 +544,12 @@ export default function App() {
             <div style={styles.hint}>
               Nach Login wird der Sperrbildschirm entfernt und die Extension erhaelt ein JWT.
             </div>
+            {typeof window !== "undefined" &&
+              !/^https?:\/\/(localhost|127\.0\.0\.1)(\d*)(\/|$)/i.test(window.location.origin) && (
+              <div style={{ ...styles.hint, marginTop: 8, opacity: 0.9 }}>
+                CORS: Wenn Login/Verbindung fehlschlaegt, in Appwrite unter Auth → Platforms die aktuelle URL ({window.location.origin}) eintragen.
+              </div>
+            )}
           </div>
         </div>
       )}