refactor: use GET tenders/recommend and improve tender title UX

Load the Recommended tab from GET /api/v1/tenders/recommend instead of the
AI POST flow with 503 fallback. Fix notification pagination offset, make
tender titles selectable across list and detail views, and ignore .cursor.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/views/detail/widgets/tender_detail_header.dart

@@ -141,7 +141,7 @@ class TenderDetailHeader extends StatelessWidget {
     );
   }
 
-  Widget _titleText() => Text(
+  Widget _titleText() => SelectableText(
     detail.title ?? '',
     style: TextStyle(
       color: AppColors.grey80,