Hide tool_code blocks in UI while preserving in conversation history

[ForestMars]

Hide tool_code blocks in UI while preserving in conversation history

Problem: When MCP tools execute successfully, the raw tool_code blocks are displayed to users, making the UI ugly and confusing. However we need to keep the tool_code in context history or it confuses the model as to how to call the tool.

Expected: User sees clean message like "Email sent successfully"

Actual: User sees raw output including ```tool_code send_email(to="...", subject="...", body="...")```

Solution: In message rendering component, strip tool_code blocks from display while keeping them in conversation data sent to LLM.

Example:

• Display to user: "Email sent successfully"
• Keep in LLM context: Full message with tool_code block intact