use Istanbul dates for document alerts

src/context/AppContext.jsx

@@ -14,6 +14,7 @@ import { getUserDataSnapshot, setUserData, getPlan, bildirimleriGetir, bildirimO
 import { applyTenderStates, tenderStateKey, tenderSnapshot, publicTender, tenderSourceChanges } from '../services/tenderState';
 import { getTenderStates, saveTenderState } from '../services/account';
 import { SECTORS_LIST, INSTITUTION_TYPES_LIST } from '../data/constants';
+import { istanbulDateKey } from '../services/tenderCalendar';
 
 const AppContext = createContext();
 
@@ -710,7 +711,7 @@ export const AppProvider = ({ children }) => {
     if (!veriSenkron) return;
     const session = getToken();
     const uyariAnahtari = hesapAnahtari('ihaleist_belge_uyari_gunu', authUser?.email);
-    const bugun = new Date().toISOString().slice(0, 10);
+    const bugun = istanbulDateKey();
     try { if (localStorage.getItem(uyariAnahtari) === bugun) return; } catch { /* yoksay */ }
     listDocuments().then((d) => {
       if(getToken() !== session) return;
@@ -718,7 +719,12 @@ export const AppProvider = ({ children }) => {
       const dolan = [], yakin = [];
       for (const b of d?.belgeler || []) {
         if (!b.son_kullanma) continue;
-        const kalan = Math.ceil((new Date(b.son_kullanma).getTime() - simdi) / 86400000);
+        const rawDate = String(b.son_kullanma).trim();
+        const sonKullanmaMs = /^\d{4}-\d{2}-\d{2}$/.test(rawDate)
+          ? Date.parse(`${rawDate}T00:00:00+03:00`)
+          : Date.parse(rawDate);
+        if (!Number.isFinite(sonKullanmaMs)) continue;
+        const kalan = Math.ceil((sonKullanmaMs - simdi) / 86400000);
         if (kalan < 0) dolan.push(b.ad); else if (kalan <= 30) yakin.push(`${b.ad} (${kalan} gün)`);
       }
       if (dolan.length) notify(`${dolan.length} belgenin süresi dolmuş`, dolan.slice(0, 4).join(', '));