Remove unnecessary deletion

app.py

@@ -92,7 +92,7 @@ def add_chunk_to_ai_message(chunk: str):
         *messages.value[:-1],
         {
             "role": "assistant",
-            "content": messages.value[-1]["content"] + chunk,
+            "content": chunk,
         },
     ]
 
@@ -134,7 +134,6 @@ def Page():
             for extraction in extraction_stream:
                 obj = extraction.model_dump()
                 if f"{obj}" != aux.value:
-                    messages.value = [*messages.value, {"role": "assistant", "content": ""}]
                     add_chunk_to_ai_message(f"{obj}")
                     aux.value = f"{obj}"
         def result():