修复多屏崩溃

[Dami-star]

1、enhance output validation in restore copy mode
2、Delete useless display text in copy mode

Summary by Sourcery

Validate the target output in restore copy mode to prevent invalid access and remove redundant UI text in copy mode.

Bug Fixes:

• Validate that the target output exists before restoring copy mode and return an error if it doesn't.

Enhancements:

• Remove the unnecessary "duplicate of the primary screen" label from the copy mode UI.

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Dami-star

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR strengthens the restore copy mode by validating the target output exists before proceeding and cleans up the copy mode UI by removing an unnecessary text element.

File-Level Changes

Change	Details	Files
Add existence check for target output in restore copy mode	Extract targetName from virtual_output Verify targetName against m_outputList using any_of Send error and return early if validation fails	src/seat/helper.cpp
Remove unused copy mode display text in QML	Delete Text element showing duplicate-screen message	src/core/qml/CopyOutput.qml

Possibly linked issues

• Init repository #1: The PR enhances output validation in onRestoreCopyOutput to prevent multi-screen crashes when handling virtual outputs.
• #0: PR enhances output validation in restore copy mode, directly preventing crashes when an output is missing, addressing the reported crash.
• Init repository #1: The PR enhances output validation when restoring copy output, which fixes the crash occurring when moving windows between dual screens.

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