Bound hosted Gemini request latency

Use short connect and response deadlines so an unavailable AI provider cannot hold a hosted Streamlit session open.

datapilot/analyst.py

@@ -220,12 +220,12 @@ DATA:\n"""
                 "X-Server-Timeout": "30",
             },
             json=payload,
-            timeout=(5, 15),
+            timeout=(3, 8),
         )
         logger.warning("gemini_response_received status=%d", response.status_code)
     except requests.Timeout as exc:
         logger.warning("gemini_request_timed_out")
-        raise ValueError("Gemini timed out after 15 seconds. Please try again.") from exc
+        raise ValueError("Gemini timed out after 8 seconds. Please try again.") from exc
     except requests.ConnectionError as exc:
         logger.warning("gemini_connection_failed")
         raise ValueError("DataPilot could not connect to Gemini. Please try again.") from exc