fix: isolate scheduled task runs from chats

[ZhixuanYu]

Summary

Fix scheduled task execution so cron jobs no longer reuse or contaminate the latest visible chat session.

Changes

• Run each cron job in a newly created hidden chat session instead of the latest normal session.
• Keep channel mirroring intact for scheduled task execution, so external channel delivery still works.
• Mark hidden-session history events and prevent them from being inserted into the visible chat session list.
• Persist the latest cron execution result, including assistant feedback, in the cron execution log.
• Show recent execution status and feedback on scheduled task cards.
• Add unit coverage for hidden cron sessions, hidden-session cache behavior, and cron execution feedback.

Testing

• pnpm vitest run tests/unit/cronjobService.test.ts tests/unit/repositoryService.cronjob.test.ts tests/unit/repositoryService.project.test.ts tests/unit/chatQueryCache.test.ts
• pnpm run typecheck
• pnpm run build
• Manual clean UAT with an isolated workspace:
  • created a scheduled task
  • continued chatting in the original session
  • verified the cron job executed in a hidden session
  • verified the visible chat was not polluted
  • verified the scheduled task page can show recent execution feedback

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[chatgpt-codex-connector]

Avoid auto-title LLM calls for hidden cron runs

When a scheduled task creates this hidden session with an empty title, chatService.send still runs the normal title pipeline: it first applies the optimistic title and then generateSessionTitle proceeds when the current title equals that optimistic title. In workspaces with an auto-title model/API key configured, every cron execution now makes an extra LLM request just to title a hidden throwaway session; before this change the non-empty cron session titles caused that path to skip. Please either suppress title generation for cron sends or initialize these hidden sessions in a way that does not trigger the auto-title request.

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