🐛 fix(data-grid): 兼容无 navigator 的服务端渲染

- 通过 globalThis 安全注入浏览器 navigator，避免 Node 20 渲染期抛错
- 补充无 navigator 环境下的 DataGrid 服务端渲染回归测试
- 保持浏览器剪贴板行为不变

frontend/src/components/DataGrid.layout.test.tsx

@@ -149,6 +149,37 @@ const zhObjectDesignLabel = zhCnCatalog['data_grid.secondary.object_design'];
 const enUndoCellChangeLabel = enUsCatalog['data_grid.context_menu.undo_cell_change'];
 
 describe('DataGrid layout', () => {
+  it('renders without navigator in server-side environments', () => {
+    const navigatorDescriptor = Object.getOwnPropertyDescriptor(globalThis, 'navigator');
+    Reflect.deleteProperty(globalThis, 'navigator');
+
+    try {
+      expect(() => renderDataGridWithI18n(
+        <DataGrid
+          data={[]}
+          columnNames={[]}
+          loading={false}
+          tableName="users"
+          dbName="main"
+          connectionId="conn-1"
+          readOnly
+          pagination={{
+            current: 1,
+            pageSize: 100,
+            total: 0,
+          }}
+          onPageChange={() => {}}
+        />,
+      )).not.toThrow();
+    } finally {
+      if (navigatorDescriptor) {
+        Object.defineProperty(globalThis, 'navigator', navigatorDescriptor);
+      } else {
+        Reflect.deleteProperty(globalThis, 'navigator');
+      }
+    }
+  });
+
   it('renders a secondary action strip for view switching and auxiliary actions', () => {
     const markup = renderDataGridWithI18n(
       <DataGrid

frontend/src/components/DataGrid.tsx

@@ -3407,7 +3407,7 @@ const DataGrid: React.FC<DataGridProps> = ({
     isQueryResultExport,
     mergedDisplayData,
     modal,
-    navigator,
+    navigator: globalThis.navigator,
     objectType,
     pagination,
     pickDataGridOutputRows,