Action buttons on alert cards posted through a chat webhook

Alerts posted to a team chat through an incoming webhook carry only link buttons.

Offer the in-app alert actions (reprocess, dismiss, silence, send a survey, create a customer-success ticket) on those cards too, ideally without every reader having to link a personal account first.

Today: alert cards in Slack and Teams carry these buttons when the chat assistant is on; webhook cards link to Customer Success.