Improved the search for device in device management

lib/pages/device_managment/all_devices/bloc/device_managment_bloc.dart

@@ -1,8 +1,7 @@
-import 'package:bloc/bloc.dart';
 import 'package:equatable/equatable.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:syncrow_web/pages/device_managment/all_devices/models/devices_model.dart';
 import 'package:syncrow_web/services/devices_mang_api.dart';
-
 part 'device_managment_event.dart';
 part 'device_managment_state.dart';
 
@@ -13,6 +12,7 @@ class DeviceManagementBloc extends Bloc<DeviceManagementEvent, DeviceManagementS
   int _offlineCount = 0;
   int _lowBatteryCount = 0;
   List<AllDevicesModel> _selectedDevices = [];
+  List<AllDevicesModel> _filteredDevices = [];
   String productName = '';
 
   DeviceManagementBloc() : super(DeviceManagementInitial()) {
@@ -29,6 +29,7 @@ class DeviceManagementBloc extends Bloc<DeviceManagementEvent, DeviceManagementS
       final devices = await DevicesManagementApi().fetchDevices();
       _selectedDevices.clear();
       _devices = devices;
+      _filteredDevices = devices;
       _calculateDeviceCounts();
       emit(DeviceManagementLoaded(
         devices: devices,
@@ -45,7 +46,7 @@ class DeviceManagementBloc extends Bloc<DeviceManagementEvent, DeviceManagementS
 
   void _onFilterDevices(FilterDevices event, Emitter<DeviceManagementState> emit) async {
     if (_devices.isNotEmpty) {
-      final filteredDevices = _devices.where((device) {
+      _filteredDevices = _devices.where((device) {
         switch (event.filter) {
           case 'Online':
             return device.online == true;
@@ -58,7 +59,7 @@ class DeviceManagementBloc extends Bloc<DeviceManagementEvent, DeviceManagementS
         }
       }).toList();
       emit(DeviceManagementFiltered(
-        filteredDevices: filteredDevices,
+        filteredDevices: _filteredDevices,
         selectedIndex: _selectedIndex,
         onlineCount: _onlineCount,
         offlineCount: _offlineCount,
@@ -141,12 +142,7 @@ class DeviceManagementBloc extends Bloc<DeviceManagementEvent, DeviceManagementS
     }
 
     productName = event.productName ?? '';
-
-    List<AllDevicesModel> devicesToSearch = _devices;
-
-    if (state is DeviceManagementFiltered) {
-      devicesToSearch = (state as DeviceManagementFiltered).filteredDevices;
-    }
+    List<AllDevicesModel> devicesToSearch = _filteredDevices;
 
     if (devicesToSearch.isNotEmpty) {
       _selectedDevices.clear();