Unwrap FinalAnswerStep before rendering final answer in Gradio UI

smolagents 1.13 yields the final answer wrapped in FinalAnswerStep, so
images fell through to the text branch and were shown as a repr string.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Gradio_UI.py

@@ -21,7 +21,7 @@ from typing import Optional
 
 from smolagents.agent_types import AgentAudio, AgentImage, AgentText, handle_agent_output_types
 from smolagents.agents import ActionStep, MultiStepAgent
-from smolagents.memory import MemoryStep
+from smolagents.memory import FinalAnswerStep, MemoryStep
 from smolagents.utils import _is_package_available
 
 
@@ -153,7 +153,7 @@ def stream_to_gradio(
         ):
             yield message
 
-    final_answer = step_log  # Last log is the run's final_answer
+    final_answer = step_log.final_answer if isinstance(step_log, FinalAnswerStep) else step_log  # Last log is the run's final_answer
     final_answer = handle_agent_output_types(final_answer)
 
     if isinstance(final_answer, AgentText):