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/m_tenders_page.dart

@@ -9,6 +9,7 @@ import '../../../core/utils/app_toast.dart';
 import '../../shared/tender_app_bar.dart';
 import '../strings/tenders_strings.dart';
 import '../widgets/main_tenders_slider.dart';
+import '../widgets/windowed_pagination.dart';
 
 class MobileTendersPage extends StatefulWidget {
   const MobileTendersPage({super.key});
@@ -61,13 +62,29 @@ class _MobileTendersPageState extends State<MobileTendersPage> {
               return const Center(child: Text(CommonStrings.noData));
             }
 
-            return SingleChildScrollView(
-              child: Padding(
-                padding: EdgeInsets.symmetric(vertical: 18.0.h()),
-                child: MainTendersSlider(
-                  tenders: viewModel.tendersResponse?.data?.tenders ?? [],
+            return Column(
+              children: [
+                Expanded(
+                  child: SingleChildScrollView(
+                    child: Padding(
+                      padding: EdgeInsets.symmetric(vertical: 18.0.h()),
+                      child: MainTendersSlider(
+                        key: ValueKey(
+                          'tenders-slider-${viewModel.currentPageIndex}',
+                        ),
+                        tenders:
+                            viewModel.tendersResponse?.data?.tenders ?? [],
+                      ),
+                    ),
+                  ),
                 ),
-              ),
+                WindowedPagination(
+                  currentPage: viewModel.currentPageIndex,
+                  totalPages: viewModel.totalPages,
+                  onPageChanged: viewModel.handlePaginationChange,
+                  compact: true,
+                ),
+              ],
             );
           },
         ),