Host-side "Mark as Accepted" for Tasks

Allow hosts to manually override a task's status to "Accepted" and include an optional note (e.g., "confirmed via WhatsApp"). This is needed for cleaners who confirm via text or phone rather than the task link, ensuring the "Pending" status remains a reliable signal for turnovers that haven't been confirmed.

Additionally, show the accepted/pending status on the task calendar view, so unconfirmed same-day turnovers stand out at a glance.