Redesigned trigger display in assistant chat

Webhook and scheduled triggers now appear as message bubbles in the assistant chat, with a clear visual hierarchy showing the trigger type, name, and timestamp. Webhook triggers display a human-readable message parsed from the incoming payload instead of raw data, making conversations easier to scan at a glance.

A new "Show Details" toggle reveals the full raw payload in a copyable code block when you need it, and long messages clamp with a fade so the conversation stays tidy. Webhook and time-based triggers now share a consistent style end-to-end.