usability fixes

lib/screens/provider/provider_controller.dart

@@ -144,13 +144,17 @@ class ProviderController extends ChangeNotifier {
 
   // ── Payment Processors ─────────────────────────────────────
 
-  Future<ApiResponse<List<PaymentProcessor>>> loadProcessors() async {
+  Future<ApiResponse<List<PaymentProcessor>>> loadProcessors(
+    String currency,
+  ) async {
     model.isLoadingProcessors = true;
     model.errorMessage = null;
     if (!_disposed) notifyListeners();
 
     try {
-      final raw = await http.get('/public/payment-processors');
+      final raw = await http.get(
+        '/public/payment-processors?currency=$currency',
+      );
       final response = _unwrap(raw);
       final List<dynamic> list = response is List
           ? response