Fix: reset editor screen between captures

moneymgr_mobile/lib/widgets/expense_editor.dart

@@ -65,6 +65,11 @@ class ExpenseEditor extends HookConsumerWidget {
           time: timeController.value,
         ),
       );
+
+      // Reset screen after a scan
+      await pending.value;
+      labelController.text = "";
+      costController.text = "";
     }
 
     // Cancel operation