Improve tool UI output rendering

[GindaChen]

Summary

• use tool view models to render descriptions, commands, and args instead of raw JSON blobs in both saved and streaming tool parts
• collapse titles now show the generated summary so bash tools display their description while others highlight the first available info
• stream tool output by accumulating deltas in the Python backend and the React hook so tool responses arrive progressively
  Testing
• Not run (not requested)

[github-actions]

🚀 Preview Deployed

Preview (Setup)	https://hao-ai-lab--research-agent-preview-pr-279-preview-app.modal.run/#setup=eyJhcGlVcmwiOiJodHRwczovL2hhby1haS1sYWItLXJlc2VhcmNoLWFnZW50LXByZXZpZXctcHItMjc5LXByZXZpZXctc2VydmVyLm1vZGFsLnJ1biIsImF1dGhUb2tlbiI6IjgwM2EwMTQ2MDVhMzkwZGE1MGJiNzc4ZTk1NzE1YTViZWJlMTk2NDI4ZWI5MDlkNzlmMzUzNzA2NzM3ZDIzNWYifQ
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OpenCode	https://hao-ai-lab--research-agent-preview-pr-279-preview-opencode.modal.run
Server	https://hao-ai-lab--research-agent-preview-pr-279-preview-server.modal.run
Commit	09edc25
Deploy time	39s
Status	✅ Deployed & Verified

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Updated at 2026-02-20T19:52:12.473Z