Refactor tenders pagination and enhance API integration

- Updated TendersRepository and TendersService to support cursor-based pagination.
- Modified TendersViewModel to manage pagination state and handle API responses more effectively.
- Replaced existing pagination UI components with a new WindowedPagination widget across desktop, mobile, and tablet views.
- Improved notification handling in the UI to reflect the presence of notifications dynamically.
- Adjusted main tenders slider to ensure proper rendering based on the current page index.

lib/views/tenders/pages/t_tenders_page.dart

@@ -5,6 +5,7 @@ import 'package:tm_app/core/utils/size_config.dart';
 import 'package:tm_app/view_models/tenders_view_model.dart';
 import 'package:tm_app/views/shared/tablet_navigation_widget.dart';
 import 'package:tm_app/views/tenders/widgets/main_tenders_slider.dart';
+import 'package:tm_app/views/tenders/widgets/windowed_pagination.dart';
 
 import '../../../core/constants/common_strings.dart';
 import '../../shared/tender_app_bar.dart';
@@ -53,16 +54,30 @@ class _TabletTendersPageState extends State<TabletTendersPage> {
               viewModel.isLoading == false) {
             return const Center(child: Text(CommonStrings.noData));
           }
-          return SingleChildScrollView(
-            child: Padding(
-              padding: EdgeInsetsDirectional.only(
-                end: 24.0.w(),
-                top: 128.0.h(),
+          return Column(
+            children: [
+              Expanded(
+                child: SingleChildScrollView(
+                  child: Padding(
+                    padding: EdgeInsetsDirectional.only(
+                      end: 24.0.w(),
+                      top: 128.0.h(),
+                    ),
+                    child: MainTendersSlider(
+                      key: ValueKey(
+                        'tenders-slider-${viewModel.currentPageIndex}',
+                      ),
+                      tenders: viewModel.tendersResponse?.data?.tenders ?? [],
+                    ),
+                  ),
+                ),
               ),
-              child: MainTendersSlider(
-                tenders: viewModel.tendersResponse?.data?.tenders ?? [],
+              WindowedPagination(
+                currentPage: viewModel.currentPageIndex,
+                totalPages: viewModel.totalPages,
+                onPageChanged: viewModel.handlePaginationChange,
               ),
-            ),
+            ],
           );
         },
       ),