fix: hide internal cron prompts from webui

nanobot/session/webui_turns.py

@@ -22,6 +22,7 @@ from nanobot.bus.runtime_events import (
     TurnCompleted,
     TurnRunStatusChanged,
 )
+from nanobot.cron.session_turns import CRON_HISTORY_META
 from nanobot.providers.base import LLMProvider
 from nanobot.session.goal_state import goal_state_ws_blob
 from nanobot.session.manager import Session, SessionManager
@@ -68,6 +69,8 @@ def _title_inputs(session: Session) -> tuple[str, str]:
     for message in session.messages:
         if message.get("_command") is True:
             continue
+        if message.get(CRON_HISTORY_META) is True:
+            continue
         role = message.get("role")
         content = message.get("content")
         if not isinstance(content, str) or not content.strip():