✨ feat(frontend): 升级 DataGrid 组件并引入高性能拖拽交互

- 实现基于原生 DOM 事件的零渲染列宽拖拽，彻底解决卡顿与误触排序问题
- 查询编辑器集成 DataGrid，支持 SQL 结果直接编辑与事务提交
- 侧边栏新增上下文感知的 "新建查询" 快捷入口
- 优化 TabManager 渲染逻辑与全局布局，消除不必要的滚动条

frontend/src/components/ConnectionModal.tsx

@@ -1,7 +1,7 @@
 import React, { useState } from 'react';
 import { Modal, Form, Input, InputNumber, Button, message, Checkbox, Divider, Collapse, Select } from 'antd';
 import { useStore } from '../store';
-import { MySQLConnect } from '../../wailsjs/go/main/App';
+import { MySQLConnect } from '../../wailsjs/go/app/App';
 
 const ConnectionModal: React.FC<{ open: boolean; onClose: () => void }> = ({ open, onClose }) => {
   const [form] = Form.useForm();