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/widgets/main_tenders_slider.dart

@@ -27,31 +27,6 @@ class _MainTendersSliderState extends State<MainTendersSlider> {
   final PageController pageController = PageController(initialPage: 0);
   int currentPage = 1;
 
-  ScrollController? _scrollController;
-
-  @override
-  void initState() {
-    super.initState();
-
-    if (widget.isDesktop) {
-      _scrollController = ScrollController();
-      _scrollController!.addListener(_onScroll);
-    }
-  }
-
-  void _onScroll() {
-    if (!widget.isDesktop) {
-      return;
-    }
-    final viewModel = context.read<TendersViewModel>();
-    if (_scrollController!.position.pixels >=
-            _scrollController!.position.maxScrollExtent - 200 &&
-        viewModel.hasMoreData &&
-        !viewModel.isLoadingMore) {
-      viewModel.loadMoreTenders();
-    }
-  }
-
   void _goToPreviousPage() {
     if (currentPage == 1) {
       return;
@@ -107,7 +82,6 @@ class _MainTendersSliderState extends State<MainTendersSlider> {
   @override
   void dispose() {
     pageController.dispose();
-    _scrollController?.dispose();
     super.dispose();
   }
 
@@ -141,12 +115,6 @@ class _MainTendersSliderState extends State<MainTendersSlider> {
           if (!viewModel.hasFeedbackForTender(id)) {
             viewModel.getTenderFeedback(id);
           }
-
-          if (index >= widget.tenders.length - 1 &&
-              viewModel.hasMoreData &&
-              !viewModel.isLoadingMore) {
-            viewModel.loadMoreTenders();
-          }
         },
         itemBuilder: (context, index) {
           final tender = widget.tenders[index];