fix sync

lib/screens/main_shell.dart

@@ -2,7 +2,9 @@
 library;
 
 import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
 
+import '../providers/sync_provider.dart';
 import '../widgets/shell_tab_scope.dart';
 import 'home_screen.dart';
 import 'look_ahead_screen.dart';
@@ -24,6 +26,15 @@ class _MainShellState extends State<MainShell> {
     LookAheadScreen(),
   ];
 
+  @override
+  void initState() {
+    super.initState();
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      if (!mounted) return;
+      context.read<SyncController>().syncIfBehindServer();
+    });
+  }
+
   @override
   Widget build(BuildContext context) {
     return ShellTabScope(