fix(EditPanel): add z-index to AlertToolTip to prevent being blocked

[add-uos]

Add z-index property to AlertToolTip component to ensure it displays on top of other UI elements. Set z-index to 10000 to prevent the alert tooltip from being hidden behind other components.

为AlertToolTip组件添加z-index属性，确保提示框显示在其他UI元素之上。
将z-index设置为10000，防止提示框被其他组件遮挡。

Log: 修复EditPanel提示框被遮挡问题
PMS: BUG-353943
Influence: 修复后EditPanel的AlertToolTip提示框将正常显示，不会被其他UI 元素遮挡，提升用户体验。

Summary by Sourcery

Bug Fixes:

• Prevent the EditPanel AlertToolTip from being hidden behind overlapping UI components by assigning it a higher stacking order.

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: add-uos

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Sets a high z-order for the EditPanel AlertToolTip so it reliably appears above other UI elements, resolving a visual overlap issue.

File-Level Changes

Change	Details	Files
Ensure the EditPanel AlertToolTip renders above other components by explicitly configuring its stacking order.	Add a z property to the AlertToolTip instance used in EditPanel Set the z value to a high constant (10000) so the tooltip is not obscured by surrounding UI elements	qt6/src/qml/EditPanel.qml

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider avoiding the hard-coded z: 10000 magic number by either defining a named constant or using a value relative to surrounding components so future layout changes are easier to reason about.
• It may be safer to scope the higher z to only when showAlert is true (e.g., using a Binding or state), so the tooltip doesn't unintentionally block interactions when it is hidden or not needed.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider avoiding the hard-coded `z: 10000` magic number by either defining a named constant or using a value relative to surrounding components so future layout changes are easier to reason about.
- It may be safer to scope the higher `z` to only when `showAlert` is true (e.g., using a Binding or state), so the tooltip doesn't unintentionally block interactions when it is hidden or not needed.

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