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/data/services/tenders_service.dart

@@ -16,7 +16,8 @@ class TendersService {
 
   Future<Result<TendersResponse>> getTenders({
     required int limit,
-    required int offset,
+    int? offset,
+    String? cursor,
     String? query,
     String? sortBy,
     String? sortOrder,
@@ -27,6 +28,7 @@ class TendersService {
       TendersApi.getTenders(
         limit: limit,
         offset: offset,
+        cursor: cursor,
         query: query,
         sortBy: sortBy,
         sortOrder: sortOrder,
@@ -37,7 +39,6 @@ class TendersService {
       method: 'GET',
       (json) => TendersResponse.fromJson(json),
     );
-    print(result);
     return result;
   }