feat(side-pane): 右侧侧栏工作台（侧边聊天 / 浏览器 / 终端 / 调用轨迹 / V工程计划与 Git / 会话状态面板） - #231

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11d5960a326750d5838078e36cf38b85af677262, actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020, actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/