fix(coderd): truncate task prompt to 160 characters in notifications (#20147)

Truncates the task prompt used in notifications to a maximum of 160
characters. The length of 160 characters was chosen arbitrarily.

coderd/workspaceagents.go

@@ -484,6 +484,11 @@ func (api *API) enqueueAITaskStateNotification(
 			}
 		}
 
+		// As task prompt may be particularly long, truncate it to 160 characters for notifications.
+		if len(taskName) > 160 {
+			taskName = strutil.Truncate(taskName, 160, strutil.TruncateWithEllipsis, strutil.TruncateWithFullWords)
+		}
+
 		if _, err := api.NotificationsEnqueuer.EnqueueWithData(
 			// nolint:gocritic // Need notifier actor to enqueue notifications
 			dbauthz.AsNotifier(ctx),