Session logs and recaps in the thread

- [ ] `session_logs` — session_id, author, body, created_at.
- [ ] Recap: GM posts a recap into the session thread (modal from a *Recap* button on the correction post, or from the console); stored in `session_logs` and posted as a new message.
- [ ] Session detail and campaign page show logs in order.

Start with the session thread, session detail page, campaign page, and console entry points, then trace how messages are stored and posted. Add the session_logs fields, support a GM recap from the correction-post Recap modal or console, store it as a new message, and show logs in order on the session detail and campaign pages.

Escrito por el modelo de indexación a partir del texto del issue.