feat(messages): 重置选中的优惠券状态以支持消息提交后的清理

packages/app/src/pages/messages/index.vue

@@ -68,6 +68,7 @@ const handleSubmit = async (message: Message) => {
   // await deleteMessage(message.id.toString())
   await updateMessage({ id: message.id, isRead: '1' })
   await pageHelperRef.value?.refresh()
+  selectedCoupon.value = undefined
 }
 const handleQ = async (res) => {
   // const { data } = await getPointsCoupons({