fix(lockscreen): keep global login view above per-output greeter

[glyvut]

Raise the global login view's stacking order so greeter backgrounds created by hot-added outputs cannot occlude it.

提高全局登录界面层级，避免热插拔输出新增的每屏背景遮挡登录界面。

Log: 修复热插拔输出后锁屏登录界面被遮挡
Influence: 多屏环境下热插拔输出时锁屏登录界面仍显示在鼠标所在屏。

Summary by Sourcery

Bug Fixes:

• Keep the global lock-screen login view visible above greeter backgrounds when outputs are hot-plugged.

[deepin-ci-robot]

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Fix lock-screen stacking during output hot-plugging by explicitly placing the global login view above per-output greeter backgrounds and repositioning it whenever a new output is added.

Sequence diagram for lock-screen output hot-plug stacking

sequenceDiagram
    participant OutputManager
    participant LockScreen
    participant LoginView
    participant GreeterBackground

    OutputManager->>LockScreen: addOutput(output)
    LockScreen->>GreeterBackground: create per-output background
    LockScreen->>LockScreen: repositionLoginView()
    LockScreen->>LoginView: setZ(1)
    LoginView-->>GreeterBackground: remains above background

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File-Level Changes

Change	Details	Files
Ensure the global login view is restored above newly added per-output greeter backgrounds.	Reposition the login view after adding a hot-plugged output and its background item. Assign the login view a positive Z value so it renders above per-output greeter content. Retain the existing repositioning logic during login-view creation.	src/core/lockscreen.cpp

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: glyvut, zccrs

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