Feat/webui video

[suluyana]

1. websocket连接终止优化；后端 卡死、退出、结束，前端不再仍processing
2. 增加retry按钮，当任务失败（尤其是因为api限流等情况失败）时，可直接retry继续运行
3. 本地文件隔离：按session_id隔离，旧任务不再被新任务覆盖
4. 对话中文件预览增加流式传输，支持图片、视频预览
5. 生成的视频支持在对话中显示
6. 文件列表支持显示
7. 优化后端output读取，避免因超长output失败

[gemini-code-assist]

Summary of Changes

Hello @suluyana, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求主要聚焦于提升Web UI的用户体验和后端代理的健壮性。通过优化WebSocket连接处理，前端能够更准确地反映后端状态，避免假性“处理中”。新增的任务重试和会话文件隔离功能，极大地提高了开发效率和数据安全性。此外，对话中对多媒体文件的直接预览和文件列表的显示，使得用户能够更直观地与代理交互并查看生成结果。

Highlights

• WebSocket连接优化: 优化了WebSocket连接的终止逻辑，确保后端进程卡死、退出或结束时，前端不再显示“处理中”状态，提升了用户体验。
• 任务重试功能: 为失败的任务增加了“重试”按钮，特别是针对API限流等原因导致的失败，用户可以直接重试，无需重新输入指令。
• 本地文件隔离: 实现了按session_id隔离本地文件，避免了新任务覆盖旧任务生成的文件，确保了不同会话之间的数据独立性。
• 对话中文件预览增强: 在对话中增加了文件预览的流式传输支持，现在可以直接预览图片、视频和音频文件，并支持在对话中显示生成的视频。
• 文件列表功能: 前端现在支持显示文件列表，并提供了更灵活的文件路径解析和安全检查机制。
• 后端输出读取健壮性: 重构了后端agent_runner的输出读取逻辑，采用分块读取而非逐行读取，解决了readline可能导致的阻塞问题，提高了稳定性。

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[gemini-code-assist]

Code Review

此拉取请求引入了多项重要改进，显著提升了WebUI的稳定性、可用性和功能性。主要亮点包括：

1. 会话专用文件隔离：本地文件现在按会话ID隔离，有效避免了多用户环境下的文件冲突。
2. 健壮的WebSocket处理：前端现在能更优雅地处理意外的WebSocket断开连接和非JSON消息，防止UI卡在“处理中”状态。
3. 对话中的媒体预览：UI现在支持在对话视图和文件输出对话框中直接流式传输和显示图像及视频文件。
4. 重试机制：为用户消息添加了重试按钮，方便用户重新运行失败的任务。
5. 改进的错误处理和日志记录：后端日志记录得到增强，前端错误状态管理更加一致。

总的来说，这些变更对用户体验和系统可靠性都有积极影响。