search logic added to desktop tenders

lib/core/utils/device_utils.dart

@@ -0,0 +1,24 @@
+import 'package:flutter/material.dart';
+import 'package:tm_app/core/utils/breakpoints.dart';
+
+/// Utility class for device and platform detection
+class DeviceUtils {
+  /// Check if the current context represents a desktop screen
+  static bool isDesktop(BuildContext context) {
+    final size = MediaQuery.sizeOf(context);
+    return size.displaySize == DisplaySize.medium ||
+        size.displaySize == DisplaySize.large;
+  }
+
+  /// Check if the current context represents a mobile screen
+  static bool isMobile(BuildContext context) {
+    final size = MediaQuery.sizeOf(context);
+    return size.displaySize == DisplaySize.extraSmall;
+  }
+
+  /// Check if the current context represents a tablet screen
+  static bool isTablet(BuildContext context) {
+    final size = MediaQuery.sizeOf(context);
+    return size.displaySize == DisplaySize.small;
+  }
+}