reconcile official tender dates on detail open

tests/tender-detail-fetch.test.mjs

@@ -1,6 +1,6 @@
 import test from 'node:test';
 import assert from 'node:assert/strict';
-import {fetchTenderDetail} from '../src/services/tenderApi.js';
+import {fetchTenderDetail,fetchOfficialTenderDetail} from '../src/services/tenderApi.js';
 test('detail loading rejects empty source, supports retry and stops on timeout/cancel',async()=>{
   const original=globalThis.fetch;
   try {
@@ -36,3 +36,17 @@ test('search-only detail uses IKN endpoint and warns when official announcement
   await assert.rejects(fetchTenderDetail('ekap-2026/123'),/İKN/);
  } finally {globalThis.fetch=original;}
 });
+
+test('official tender detail keeps EKAP date authoritative and validates IKN',async()=>{
+ const original=globalThis.fetch;
+ try {
+  globalThis.fetch=async url=>{
+   assert.equal(url,'/api/documents/ilan?ikn=2026%2F1573235');
+   return Response.json({success:true,ikn:'2026/1573235',tarih:'16.09.2026',saat:'10:00',sourceDateTime:'16.09.2026 10:00',metin:'EKAP ilanı'});
+  };
+  const detail=await fetchOfficialTenderDetail(' 2026/1573235 ');
+  assert.equal(detail.tarih,'16.09.2026');
+  globalThis.fetch=async()=>Response.json({success:true,ikn:'2026/999',tarih:'10.09.2026',saat:'10:00'});
+  await assert.rejects(()=>fetchOfficialTenderDetail('2026/1573235'),/İKN/);
+ } finally {globalThis.fetch=original;}
+});