R69 完成业务验收与会话稳定性修复

client/src/pages/MobileApprovalsPage.tsx

@@ -228,7 +228,7 @@ export function MobileApprovalsPage() {
   const [transferToApproverId, setTransferToApproverId] = useState("");
   const [transferReason, setTransferReason] = useState("");
   const [offlineDraftSubmitting, setOfflineDraftSubmitting] = useState(false);
-  const [isOnline, setIsOnline] = useState<boolean>(typeof navigator === "undefined" ? true : navigator.onLine);
+  const [isOnline, setIsOnline] = useState(true);
   const autoSyncRequestedRef = useRef(false);
 
   const ownerEmployeeId = me?.id ?? null;
@@ -673,6 +673,12 @@ export function MobileApprovalsPage() {
     };
   }, []);
 
+  useEffect(() => {
+    if (accessToken) {
+      setIsOnline(true);
+    }
+  }, [accessToken]);
+
   useEffect(() => {
     if (!autoSyncRequestedRef.current || !canUseRemote || syncMutation.isPending) {
       return;