Describe the bug
When streaming outputs, the GradioUI displays the plan twice:

Related to:

• [BUG] Broken gradio display after stream output feat #1305

Code to reproduce the error
The code in examples/gradio_ui.py

Error logs (if any)
Provide error logs if there are any.

Expected behavior
A clear and concise description of what you expected to happen.

Packages version:
Run pip freeze | grep smolagents and paste it here.

Additional context
Add any other context about the problem here.