feat: Refactor CommunitiesManager to utilize PageHeaderActions component for action buttons, improving UI consistency and reducing redundancy

frontend/src/CommunitiesManager.jsx

@@ -15,6 +15,7 @@ import {
   IconHash,
   IconFilter
 } from '@tabler/icons-react';
+import PageHeaderActions from './components/PageHeaderActions.jsx';
 
 const API_URL = '/api';
 
@@ -180,12 +181,16 @@ function CommunitiesManager() {
             <div className="page-pretitle">Главная / Данные / Community</div>
           </div>
           <div className="col-auto ms-auto d-print-none">
-            <div className="btn-list">
-              <button className="btn btn-outline-secondary" onClick={fetchItems} disabled={loading}><IconRefresh className="me-2" />Обновить</button>
-              <button className="btn btn-outline-primary" onClick={handleImport}><IconUpload className="me-2" />Импорт JSON</button>
-              <button className="btn btn-outline-primary" onClick={handleExport} disabled={items.length === 0}><IconDownload className="me-2" />Экспорт</button>
-              <button className="btn btn-primary" onClick={handleSave} disabled={loading}><IconDeviceFloppy className="me-2" />Сохранить в S3</button>
-            </div>
+            <PageHeaderActions
+              loading={loading}
+              onRefresh={fetchItems}
+              disableRefresh={loading}
+              onImport={handleImport}
+              onExport={handleExport}
+              disableExport={items.length === 0}
+              onSave={handleSave}
+              disableSave={loading}
+            />
           </div>
         </div>
       </div>
@@ -236,15 +241,7 @@ function CommunitiesManager() {
             </div>
           </div>
 
-          <div className="card card-md">
-            <div className="card-header"><h3 className="card-title"><IconDatabase className="me-2" />Действия</h3></div>
-            <div className="card-body d-grid gap-2">
-              <button className="btn btn-outline-secondary" onClick={fetchItems} disabled={loading}><IconRefresh className="me-2" />Обновить</button>
-              <button className="btn btn-outline-primary" onClick={handleImport}><IconUpload className="me-2" />Импорт JSON</button>
-              <button className="btn btn-outline-primary" onClick={handleExport} disabled={items.length === 0}><IconDownload className="me-2" />Экспорт</button>
-              <button className="btn btn-primary" onClick={handleSave} disabled={loading}><IconDeviceFloppy className="me-2" />Сохранить в S3</button>
-            </div>
-          </div>
+          {/* Карточка действий не нужна — действия перенесены в page-header */}
         </div>
 
         <div className="col-lg-9">