add accessible preparation table caption

src/components/PreparationOverview.jsx

@@ -29,7 +29,7 @@ function Overview({tenders,now}) {
   {vault.loading&&<p role="status" className="text-xs">Belge durumu kontrol ediliyor…</p>}
   {vault.error&&<p role="alert" className="text-xs text-red-700">Belge durumu doğrulanamadı: {vault.error}</p>}
   {!tenders.length ? <p className="text-sm">İhaleyi takibe alın veya hazırlık görevi açın; dosyası burada görünsün.</p> :
-   <div><table role="table" className="block md:table w-full text-sm table-fixed">
+   <div><table role="table" className="block md:table w-full text-sm table-fixed"><caption className="sr-only">Hazırlık dosyaları, sorumlular ve sıradaki kontroller</caption>
     <thead role="rowgroup" className="sr-only md:not-sr-only md:table-header-group"><tr role="row" className="text-left border-b"><th role="columnheader" scope="col" className="p-2">İhale</th><th role="columnheader" scope="col" className="p-2">Sorumlu</th><th role="columnheader" scope="col" className="p-2">Belge eksikleri</th><th role="columnheader" scope="col" className="p-2">Sıradaki kontrol</th></tr></thead>
     <tbody role="rowgroup" className="block md:table-row-group">{tenders.map(tender=>{
      const summary=preparationSummary(tender,{...vault,healthPortfolio:userProfile.scrapedCapabilities?.healthPortfolio || []},now);