refactor: Update input group styling and button placement in FilterManager for improved layout and user interaction

frontend/src/FilterManager.jsx

@@ -654,7 +654,7 @@ function FilterManager() {
                 Готовые конфигурации серверов
               </h3>
               <div className="card-actions">
-                <div className="input-group input-group-sm me-3" style={{ width: '300px' }}>
+                <div className="input-group" style={{ maxWidth: 400 }}>
                   <span className="input-group-text">
                     <IconSearch />
                   </span>
@@ -665,16 +665,18 @@ function FilterManager() {
                     value={searchTerm}
                     onChange={(e) => setSearchTerm(e.target.value)}
                   />
-                </div>
                   <button
-                  className="btn btn-primary btn-sm"
+                    className="btn btn-primary"
+                    type="button"
                     onClick={() => setServerConfigModalOpen(true)}
+                    style={{ display: 'flex', alignItems: 'center', gap: 6 }}
                   >
-                  <IconPlus className="me-2" />
+                    <IconPlus className="me-1" />
                     Добавить сервер
                   </button>
                 </div>
               </div>
+            </div>
             <div className="card-body">
               {servers.length === 0 ? (
                 <div className="text-center text-muted py-4">