✨ feat(query-editor): 支持查询重命名导出与保存快捷键

- 支持已保存查询重命名并同步当前标签标题

- 新增 SQL 文件导出接口、Wails 绑定和浏览器 mock

- 补充 Ctrl/Cmd+S 保存查询与 Ctrl+, 快捷键入口修复

- 覆盖 SQL 编辑器保存、导出和快捷键回归测试

frontend/src/main.tsx

@@ -216,6 +216,7 @@ if (typeof window !== 'undefined' && !(window as any).go) {
                 ListSQLDirectory: async () => ({ success: true, data: [] }),
                 ReadSQLFile: async () => ({ success: false, message: '已取消' }),
                 WriteSQLFile: async (_filePath: string, _content: string) => ({ success: true }),
+                ExportSQLFile: async (_defaultName: string, _content: string) => ({ success: false, message: '浏览器 mock 不支持 SQL 文件导出' }),
                 InstallUpdateAndRestart: async () => ({ success: false }),
                 ImportConfigFile: async () => ({ success: false, message: '已取消' }),
                 ImportConnectionsPayload: async (raw: string, _password?: string) => {