enh: include message_turn metadata

src/lib/components/chat/Messages/ResponseMessage.svelte

@@ -377,7 +377,8 @@
 				arena: message ? message.arena : false,
 				model_id: message.model,
 				message_id: message.id,
-				chat_id: chatId
+				chat_id: chatId,
+				message_turn: createMessagesList(history, message.id).length
 			},
 			snapshot: {
 				chat: chat