Fix duplicate scrollbars in space_users_list page

[Copilot]

The space users list page exhibited three layout issues: department tree scrollbar appearing at page level instead of within sidebar, user list showing a second vertical scrollbar, and page jumping on initial load.

Changes

Flexbox height constraints

• Sidebar wrapper: Added h-full to constrain height within parent flex container
• Right content wrapper: Added overflow-hidden h-full flex flex-col to establish proper flex context
• User listview: Added h-full flex-1 to fill available space

CSS overflow management

".space-users-list-custom-page.space-users-list-pc .space-users-list-sidebar-wrapper .antd-Form-item .antd-Tree": {
  "max-height": "100%",  // was "none"
  "overflow-y": "auto"
}

This creates a proper containment hierarchy: sidebar scrolls independently, user list fills remaining space without generating its own scrollbar, and explicit heights prevent layout shifts on load.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Bug]: 人员列表，左侧部门树很多时，人员列表会出现两个纵向滚动条</issue_title>
<issue_description>### Description

Steps To Reproduce 重现步骤

fssh环境

Version 版本

3.0.8</issue_description>

Comments on the Issue (you are @copilot in this section)

@lizheng-steedos space_users_list.page.amis.json这个微页面，有几个问题： 1、左侧组织，右侧人员列表，左侧组织很多的情况下，组织树的滚动条变到了最右侧的页面滚动条；人员列表还会有单独的滚动条； 2、人员单独的滚动条高度计算的不对，显示有问题； 3、默认进入这个页面会跳上去，把顶部的字段名称行盖住；

• Fixes [Bug]: 人员列表，左侧部门树很多时，人员列表会出现两个纵向滚动条 #8268

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