added csv-agent-default in next.js

gemini_report_generator.py

@@ -270,7 +270,7 @@ class RethinkAgent(BaseModel):
 def gemini_llm_chat(csv_url: str, query: str, conversation_history: List[Dict[str, Any]]) -> Dict[str, Any]:
     try:
         df = pd.read_csv(csv_url)
-        agent = RethinkAgent(df=df, conversation_history=conversation_history)
+        agent = RethinkAgent(df=df, conversation=conversation_history)
         
         if not agent.initialize_model(API_KEYS):
             return {"error": "API configuration failed"}