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/model/meta/meta.g.dart

@@ -12,6 +12,9 @@ _Meta _$MetaFromJson(Map<String, dynamic> json) => _Meta(
   page: (json['page'] as num?)?.toInt(),
   pages: (json['pages'] as num?)?.toInt(),
   total: (json['total'] as num?)?.toInt(),
+  hasMore: json['has_more'] as bool?,
+  nextCursor: json['next_cursor'] as String?,
+  prevCursor: json['prev_cursor'] as String?,
 );
 
 Map<String, dynamic> _$MetaToJson(_Meta instance) => <String, dynamic>{
@@ -20,4 +23,7 @@ Map<String, dynamic> _$MetaToJson(_Meta instance) => <String, dynamic>{
   'page': instance.page,
   'pages': instance.pages,
   'total': instance.total,
+  'has_more': instance.hasMore,
+  'next_cursor': instance.nextCursor,
+  'prev_cursor': instance.prevCursor,
 };