diff --git a/frontend/src/components/sidebar/SidebarConnectionRail.tsx b/frontend/src/components/sidebar/SidebarConnectionRail.tsx
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+import React from 'react';
+import { Tooltip, Form } from 'antd';
+import {
+ FolderOpenOutlined,
+ TableOutlined,
+ DatabaseOutlined,
+ FileAddOutlined,
+ AimOutlined,
+ RobotOutlined,
+ ToolOutlined,
+ SettingOutlined,
+} from '@ant-design/icons';
+
+// V2 Connection Rail 子组件（从 Sidebar.tsx 抽取）。
+//
+// 注意：本组件是 Sidebar.tsx 拆分的一部分，依赖大量主组件的 label/state/handler。
+// 通过聚合 props 对象传递，避免 18+ 个独立 props 的 drilling 噪音。
+// 后续状态管理重构（PR-A）会把 labels/handlers 迁到 useSidebarUIState hook。
+//
+// 设计取舍：用 labels + handlers 聚合对象 + FormInstance，换取 Sidebar.tsx 减少 ~100 行。
+// 主组件 props drilling 复杂度可控（只有一处调用点）。
+
+export interface SidebarConnectionRailProps {
+ labels: {
+ railSystemActions: string;
+ railObjectActions: string;
+ newGroup: string;
+ batchTables: string;
+ batchDatabases: string;
+ openExternalSqlFile: string;
+ locateCurrentTable: string;
+ locateCurrentTableUnavailable: string;
+ aiAssistant: string;
+ tools: string;
+ settings: string;
+ };
+ handlers: {
+ openCreateTagModal: () => void;
+ openBatchTableExport: () => void;
+ openBatchDatabaseExport: () => void;
+ openExternalSqlFile: () => void;
+ locateActiveTab: () => void;
+ toggleAI: () => void;
+ openTools: () => void;
+ openSettings: () => void;
+ };
+ canLocateActiveTab: boolean;
+}
+
+const SidebarConnectionRail: React.FC
= ({ labels, handlers, canLocateActiveTab }) => (
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