Fix produk hilang: _loadProducts try-catch + auto refreshSession sebelum refresh

lib/state/app_state.dart

@@ -191,6 +191,7 @@ class AppState extends ChangeNotifier {
   }
 
   Future<void> refresh() async {
+    await _ensureSession();
     await _loadProducts();
     await _loadSales();
     notifyListeners();
@@ -505,12 +506,31 @@ class AppState extends ChangeNotifier {
   }
 
   Future<void> _loadProducts() async {
+    try {
       final rows = await _withTimeout(
         _supabase.from('products').select().eq('store_id', _currentStoreId).order('name'),
         'Load products',
       );
       products = rows.map((e) => Product.fromJson(e)).toList();
       if (products.isEmpty) _seed();
+    } catch (e) {
+      // Jangan crash refresh: produk lama tetap ditampilkan, error tercatat di log.
+      debugPrint('Gagal load products: $e');
+    }
+  }
+
+  /// Coba perbarui session auth yang kedaluwarsa. Return true jika session valid.
+  Future<bool> _ensureSession() async {
+    try {
+      final session = _supabase.auth.currentSession;
+      if (session == null) return false;
+      if (!session.isExpired) return true;
+      final res = await _supabase.auth.refreshSession();
+      return res.session != null && !res.session!.isExpired;
+    } catch (e) {
+      debugPrint('Gagal refresh session: $e');
+      return false;
+    }
   }
 
   Future<void> _loadSales() async {