Describe the bug
When connecting to an MCP server and then disconnecting it, a thread consumes 100% of a cpu core.

To Reproduce
Steps to reproduce the behavior:

Run the minimal script below:

import chainlit as cl

from mcp import ClientSession

@cl.on_chat_start
async def chat_start():
    await cl.Message(content="hello world").send()

@cl.on_mcp_connect
async def mcp_connect(connection, session: ClientSession):
    tools = await session.list_tools()
    print(f"connect mcp: {tools}")

1. Access the chat window.
2. Add an MCP server.
3. Disconnect from the MCP server.

After disconnecting, one CPU core gets stuck at 100% utilization due to an async thread.

I found that except Exception: pass in disconnect_mcp() hides an exception Attempted to exit cancel scope in a different task than it was entered in, which may causes the issue, I think.

ref: modelcontextprotocol/python-sdk#521

Expected behavior

The MCP server should disconnect properly (without exhausting a CPU core).

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context

I ran chainlit==2.5.5 with mcp==1.9.0 on ubuntu 24.04.