Reservation Confirmed 预约成功弹层。布局:底层 Live 变暗+彩带;底部弹层「Reservation Confirmed!」+关闭X;「Add to calendar」按钮;「Invite your friends for free」头像;Send message/Share on story/Share Event。看点:预约成功即引导加日历+邀友裂变,彩带增强庆祝感。