fix open redirect, error leaking, unused imports, state validation

surfsense_backend/app/agents/new_chat/tools/luma/_auth.py

@@ -1,14 +1,10 @@
 """Shared auth helper for Luma agent tools."""
 
-import logging
-
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.future import select
 
 from app.db import SearchSourceConnector, SearchSourceConnectorType
 
-logger = logging.getLogger(__name__)
-
 LUMA_API = "https://public-api.luma.com/v1"