completed group batch feature

lib/screens/groups/batch_create_screen.dart

@@ -6,6 +6,7 @@ import 'package:qpay/models/responsive_policy.dart';
 import 'package:qpay/screens/groups/controllers/batch_controller.dart';
 import 'package:qpay/screens/home/home_controller.dart';
 import 'package:qpay/screens/pay/pay_controller.dart';
+import 'package:qpay/widgets/app_snack_bar.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
 class BatchCreateScreen extends StatefulWidget {
@@ -57,17 +58,13 @@ class _BatchCreateScreenState extends State<BatchCreateScreen> {
     final selectedProvider = controller.model.selectedProvider;
 
     if (selectedProvider == null) {
-      ScaffoldMessenger.of(context).showSnackBar(
-        const SnackBar(content: Text('Please select a bill provider.')),
-      );
+      AppSnackBar.show(context, 'Please select a bill provider.');
       return;
     }
 
     final amount = double.tryParse(_amountController.text.trim());
     if (amount == null || amount <= 0) {
-      ScaffoldMessenger.of(context).showSnackBar(
-        const SnackBar(content: Text('Please enter a valid amount.')),
-      );
+      AppSnackBar.show(context, 'Please enter a valid amount.');
       return;
     }
 
@@ -106,8 +103,9 @@ class _BatchCreateScreenState extends State<BatchCreateScreen> {
       final batch = result.data!;
       context.pushReplacement('/groups/${widget.group.id}/batches/${batch.id}');
     } else {
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(result.error ?? 'Failed to create batch.')),
+      AppSnackBar.showError(
+        context,
+        result.error ?? 'Failed to create batch.',
       );
     }
   }
@@ -441,38 +439,4 @@ class _BatchCreateScreenState extends State<BatchCreateScreen> {
       ),
     );
   }
-
-  Widget _buildProcessorDropdown() {
-    if (controller.model.processors.isEmpty) {
-      return Container(
-        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
-        decoration: BoxDecoration(
-          border: Border.all(color: Colors.black26),
-          borderRadius: BorderRadius.circular(12),
-        ),
-        child: Text(
-          'No processors available',
-          style: TextStyle(color: Colors.grey.shade600),
-        ),
-      );
-    }
-    return DropdownButtonFormField<PaymentProcessor>(
-      value: controller.model.selectedProcessor,
-      isExpanded: true,
-      decoration: InputDecoration(
-        border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
-      ),
-      items: controller.model.processors
-          .map(
-            (p) => DropdownMenuItem(
-              value: p,
-              child: Text(p.name, overflow: TextOverflow.ellipsis),
-            ),
-          )
-          .toList(),
-      onChanged: (p) {
-        if (p != null) controller.selectProcessor(p);
-      },
-    );
-  }
 }