更新当前的选中状态

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private fun updateSelectStatus(curUser: User) {
    mAdapter.run {
        var targetPosition = -1
        var previousCheckedPosition = -1

        // 遍历一次，同时更新状态并记录位置
        data.forEachIndexed { index, user ->
            val wasChecked = user.isChecked
            val shouldBeChecked = (user.uid == curUser.uid)
            if (wasChecked != shouldBeChecked) {
                user.isChecked = shouldBeChecked
                if (shouldBeChecked) {
                    targetPosition = index
                } else {
                    previousCheckedPosition = index
                }
            }
        }

        // 安全地滚动到目标位置
        if (targetPosition != -1) {
            mBinding.rvUser.smoothScrollToPosition(targetPosition)
        }

        // 精确通知变化
        if (previousCheckedPosition != -1) {
            notifyItemChanged(previousCheckedPosition)
        }
        if (targetPosition != -1 && targetPosition != previousCheckedPosition) {
            notifyItemChanged(targetPosition)
        }
    }
}