Update LangChain to 1.0 and fix UI bugs

[victorm-lc]

Problem

When connecting to a LangChain 1.0 backend, the UI crashed with:

Unable to coerce message from array: only human, AI, system, developer, or tool message coercion is currently supported.

Received: {
  "content": "",
  "additional_kwargs": {},
  "response_metadata": {},
  "type": "remove",
  "name": null,
  "id": "__remove_all__"
}

This happened because the UI was built with pre-1.0 LangChain packages that don't recognize new message types like "remove".

Changes

• Upgrade @langchain/core to 1.0.2 and @langchain/langgraph-sdk to 1.0.0
• Replace deprecated Sass @import with @use syntax
• Fix FileViewDialog to handle non-string file content
• Fix files list being replaced instead of accumulated on updates

Testing

Tested with local DeepAgent running LangChain 1.0. All features working correctly.

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
deep-agents-ui	Error			Oct 27, 2025 10:13pm