fix: Update TypeScript types for search parameters

frontend/components/TenderSearch.tsx

@@ -6,7 +6,7 @@ import type { Tender } from "../lib/types";
 
 type Props = {
   tenders: Tender[];
-  onSearch: (params: { keyword?: string; buyer_code?: string; provider_code?: string; date?: string; skip?: number; limit?: number }) => void;
+  onSearch: (params: { keyword?: string; buyer?: string; provider_code?: string; date?: string; skip?: number; limit?: number }) => void;
   onAnalyze: (tender: Tender) => void;
   forceShowFollowed?: boolean;
 };