feat(dock): add accessibility annotations to dock QML

[hualet]

Summary

Add Qt Quick Accessible attached properties to the dock panel QML so screen readers (e.g. Orca over AT-SPI) can read the taskbar:

• AppItem: Button role, app name, and "Active"/"Demands attention" state description
• TaskManager containment and dock left/center/right areas: Grouping role with names (plain names without a role map to AT-SPI filler and get ignored by Orca)
• Container ListViews (OverflowContainer): List role
• Action buttons (show desktop, multitask view, tray collapse/stash/quick-settings): Button role + name, reusing existing toolTip text
• Embedded tray surfaces (ShellSurfaceItemProxy): expose the plugin's displayName when available

Annotations only — no focus, behavior, or layout changes (+31 lines across 10 QML files).

Test

• qmllint: no syntax errors, no new warnings.
• Runtime-verified on an X11 session (dock + dde-apps, QT_LINUX_ACCESSIBILITY_ALWAYS_ON=1, at-spi2): the dock window exposes "Dock Left/Center/Right Area", "Task Manager", per-app [button] nodes with names (文件管理器 / Google Chrome / …), and the active window carries the "Active" description, by walking the AT-SPI tree via GI.

Out of scope (follow-ups)

• Keyboard navigation for the dock (needs a focus strategy decision: Qt.WindowDoesNotAcceptFocus + layer-shell keyboard interactivity)
• Launcher UI annotations (lives in dde-launchpad)
• SNI tray icons' own a11y (rendered by dde-tray-loader plugin processes)

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[deepin-ci-robot]

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This pull-request has been approved by: hualet

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[deepin-ci-robot]

deepin pr auto review

★ 总体评分：95分

■ 【总体评价】

代码通过添加Accessible属性提升了无障碍支持，整体质量良好
逻辑正确，无安全漏洞，版权信息更新合理

■ 【详细分析】

• 1.语法逻辑（基本正确）✓

代码在多个QML组件中正确添加了Accessible附加属性，如Accessible.role和Accessible.name，语法符合QML规范。版权年份更新格式正确。
潜在问题：无
建议：无

• 2.代码质量（良好）✓

添加的无障碍属性命名和取值合理，提高了应用的无障碍可用性。版权信息更新及时。
潜在问题：部分组件的Accessible.name直接绑定了toolTip.text，如果toolTip未正确初始化可能导致无障碍名称缺失。
建议：确保所有绑定的toolTip.text都有初始值或提供默认的无障碍名称。

• 3.代码性能（无性能问题）✓

添加属性绑定对性能影响微乎其微，不会引入额外的计算开销或资源占用。
潜在问题：无
建议：无

• 4.代码安全（存在0个安全漏洞）✓

漏洞对比统计：新增漏洞 0 个，减少漏洞 0 个，持平 0 个
本次代码修改仅为UI层面的属性添加和版权声明更新，不涉及敏感数据处理、网络通信或系统权限操作，不存在安全风险。

• 建议：无

■ 【改进建议代码示例】

// 以 multitaskview.qml 为例，提供默认值防止无障碍名称缺失
AppletDockItem {
    id: toggleworkspace
    dockOrder: 15

    Accessible.role: Accessible.Button
    Accessible.name: toolTip.text ? toolTip.text : qsTr("Multitasking View")

    PanelToolTip {
        id: toolTip
        text: qsTr("Multitasking View")
    }
}