fix: normalize Turkish search and isolate query item matches

src/services/tenderSearch.js

@@ -0,0 +1,15 @@
+export const normalizeTenderSearch = value => String(value ?? '').normalize('NFKD')
+  .toLocaleLowerCase('tr-TR').replace(/ı/g,'i').replace(/[\u0300-\u036f]/g,'').replace(/\s+/g,' ').trim();
+
+export function matchingItemResults(result, query) {
+  return result?.query === normalizeTenderSearch(query) ? result.matches : null;
+}
+
+export function matchesTenderSearch(tender, query, itemMatches) {
+  const q=normalizeTenderSearch(query);
+  if (!q) return true;
+  const values=[tender.baslik,tender.kurum,tender.ikn,
+    ...(tender.items || []).map(item=>item.ad),
+    ...(tender.kalemler || []).map(item=>typeof item === 'string' ? item : item.ad)];
+  return values.some(v=>normalizeTenderSearch(v).includes(q)) || Boolean(itemMatches?.has(tender.ikn));
+}