refactor(DomainsNewManager): integrate LastSaved component and streamline button placement for improved UI consistency and user experience

frontend/src/DomainsNewManager.jsx

@@ -47,6 +47,7 @@ import FormField from './components/FormField.jsx';
 import Tooltip from './components/Tooltip.jsx';
 import Pagination from './components/Pagination.jsx';
 import AddItemModal from './components/AddItemModal.jsx';
+import LastSaved from './components/LastSaved.jsx';
 import { useToast } from './components/ToastContainer.jsx';
 
 const API_URL = '/api';
@@ -514,16 +515,8 @@ function DomainsNewManager() {
 
       <PageHeader
         title="Домены"
+        meta={<LastSaved timestamp={lastModified} variant="compact" />}
         actions={(
-          <div className="d-flex align-items-center gap-2">
-            <button
-              className="btn btn-primary"
-              onClick={() => setAddModalOpen(true)}
-              title="Добавить новый домен"
-            >
-              <IconPlus className="me-1" size={18} />
-              Добавить
-            </button>
           <PageHeaderActions
             loading={loading}
             onPreview={handlePreviewDiff}
@@ -540,6 +533,7 @@ function DomainsNewManager() {
             onSave={handleSaveChanges}
             disableSave={loading}
             onHistory={() => setHistoryOpen(true)}
+            lastModified={lastModified}
             onOnlineUpdate={() => setWsOpen(true)}
             onBackgroundUpdate={async () => {
               try {
@@ -554,7 +548,6 @@ function DomainsNewManager() {
               }
             }}
           />
-          </div>
         )}
       />
 
@@ -669,6 +662,16 @@ function DomainsNewManager() {
                     </div>
                   </div>
                 </div>
+                <div className="col-auto">
+                  <button
+                    className="btn btn-primary"
+                    onClick={() => setAddModalOpen(true)}
+                    title="Добавить новый домен"
+                  >
+                    <IconPlus className="me-1" size={18} />
+                    Добавить
+                  </button>
+                </div>
               </div>
             </div>
           </div>