Badge unseenSalesCount di tab Riwayat (admin only), reset saat tab dibuka

lib/state/app_state.dart

@@ -33,6 +33,16 @@ class AppState extends ChangeNotifier {
       StreamController<Sale>.broadcast();
   final Set<String> _notifiedSaleIds = {};
 
+  // Jumlah transaksi baru yang belum dilihat admin (badge di tab Riwayat).
+  int unseenSalesCount = 0;
+
+  void markSalesSeen() {
+    if (unseenSalesCount != 0) {
+      unseenSalesCount = 0;
+      notifyListeners();
+    }
+  }
+
   // Client dengan service_role key untuk operasi admin (buat/edit/hapus akun kasir).
   // PERINGATAN: key ini bypass RLS — hanya untuk app POS di device terpercaya.
   final SupabaseClient _admin = SupabaseClient(supabaseUrl, supabaseServiceKey);
@@ -159,6 +169,7 @@ class AppState extends ChangeNotifier {
       return;
     }
     final now = DateTime.now();
+    bool newSeen = false;
     for (final s in sales) {
       if (!_notifiedSaleIds.contains(s.id)) {
         _notifiedSaleIds.add(s.id);
@@ -166,12 +177,16 @@ class AppState extends ChangeNotifier {
         // Lewati juga transaksi sendiri — admin tahu kalau dia yang jualan.
         if (!_salesFirstLoad &&
             s.userId != userId &&
-            now.difference(s.date).inMinutes.abs() <= 5 &&
-            !newSaleNotifications.isClosed) {
-          newSaleNotifications.add(s);
+            now.difference(s.date).inMinutes.abs() <= 5) {
+          newSeen = true;
+          unseenSalesCount++;
+          if (!newSaleNotifications.isClosed) {
+            newSaleNotifications.add(s);
+          }
         }
       }
     }
+    if (newSeen) notifyListeners();
     _salesFirstLoad = false;
   }