feat: Добавить кнопку для копирования метаданных и отображение времени последнего изменения в компонентах PageHeaderActions и S3MetaBar

frontend/src/components/S3MetaBar.jsx

@@ -20,6 +20,17 @@ function S3MetaBar({ keys = [], className = '' }) {
 
   useEffect(() => { fetchMeta(); }, []);
 
+  const copyMeta = async (k) => {
+    try {
+      const it = meta[k] || {};
+      const text = `etag: ${it?.etag || ''}\nlastModified: ${it?.lastModified || ''}`;
+      await navigator.clipboard?.writeText(text);
+      window.notify?.success?.('Скопировано в буфер');
+    } catch (e) {
+      window.notify?.error?.('Не удалось скопировать', String(e));
+    }
+  };
+
   const renderKey = (k) => {
     const it = meta[k];
     return (
@@ -27,12 +38,15 @@ function S3MetaBar({ keys = [], className = '' }) {
         <span className="badge bg-blue-lt text-blue d-inline-flex align-items-center"><IconHash size={14} className="me-1" />{it?.etag || '—'}</span>
         <span className="badge bg-blue-lt text-blue d-inline-flex align-items-center"><IconClock size={14} className="me-1" />{it?.lastModified ? new Date(it.lastModified).toLocaleString() : '—'}</span>
         <span className="badge bg-blue-lt text-blue d-inline-flex align-items-center"><IconFileText size={14} className="me-1" />{typeof it?.contentLength === 'number' ? `${it.contentLength} байт` : '—'}</span>
+        <button className="btn btn-outline-secondary btn-sm" type="button" onClick={() => copyMeta(k)} title="Копировать ETag/Last-Modified">
+          <IconFileText size={14} className="me-1" />Копировать
+        </button>
       </div>
     );
   };
 
   return (
-    <div className={`card-footer ${className}`}>
+    <div className={`card-footer ${className}`} style={{ position: 'sticky', bottom: 0, zIndex: 5, background: 'var(--tblr-card-bg)', borderTop: '1px solid rgba(0,0,0,.05)' }}>
       <div className="d-flex align-items-center justify-content-between">
         <div className="d-flex flex-column gap-1">
           {keys.length === 0 ? renderKey('domainsNew') : keys.map(renderKey)}