fix: persist tender preparation and correct calendar export

src/components/tools/DocumentVault.jsx

@@ -20,6 +20,7 @@ export const DocumentVault = () => {
 
   const yukle = () => {
     if (!authUser) return;
+    setHata(null);
     listDocuments().then(setDurum).catch((e) => setHata(e.message));
   };
   useEffect(yukle, [authUser]);
@@ -106,6 +107,7 @@ export const DocumentVault = () => {
 
   return (
     <div className="space-y-6 animate-fade-in">
+      {hata && <button onClick={yukle} className="px-4 py-2 border rounded-lg">Yeniden dene</button>}
       <div className="bg-linear-to-r from-slate-900 via-teal-950 to-cyan-900 text-white p-6 rounded-2xl shadow-lg border border-teal-800/40">
         <div className="flex items-center gap-3">
           <div className="w-12 h-12 rounded-2xl bg-teal-600 flex items-center justify-center shadow-md">
@@ -234,7 +236,7 @@ export const DocumentVault = () => {
       )}
 
       {/* Liste */}
-      {!durum ? (
+      {!durum && !hata && !hata ? (
         <div className="flex items-center gap-2 text-xs text-slate-400"><Loader2 className="w-3.5 h-3.5 animate-spin" /> yükleniyor…</div>
       ) : durum.belgeler.length === 0 ? (
         <div className="bg-white rounded-2xl border border-dashed border-slate-300 p-10 text-center">