fix(window-button): load icon synchronously

[mhduiy]

1. Override the window button content item with a DCI icon.
2. Disable asynchronous loading for the icon to avoid a blank first frame.
3. Keep the existing palette, state, theme, and source size bindings.

Log: Load window button icons synchronously to prevent startup flicker.

fix(window-button): 同步加载窗口按钮图标

1. 使用 DCI 图标覆盖窗口按钮的内容项。
2. 关闭图标异步加载，避免启动首帧空白。
3. 保留原有调色板、状态、主题和源尺寸绑定。

Log: 同步加载窗口按钮图标，避免启动时图标闪烁。
PMS: TASK-390989

Summary by Sourcery

Bug Fixes:

• Prevent startup flicker by disabling asynchronous loading for the window button icon and binding a synchronous DCI icon as the button content.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Switches the window button to use an explicit DCI icon content item that is loaded synchronously, eliminating startup flicker while preserving existing appearance-related bindings.

File-Level Changes

Change	Details	Files
Render the window button icon via an explicit DCI icon content item loaded synchronously to avoid initial blank frames while keeping existing visual bindings.	Extend copyright year range in the WindowButton QML file. Introduce a custom contentItem using D.DciIcon bound to the control's icon name. Disable asynchronous loading on the DCI icon to ensure the icon is available on the first frame. Bind the DCI icon's palette, mode, theme, and sourceSize to the control's existing palette/state/theme and icon dimensions to preserve styling and sizing. Retain the existing icon width and height bindings on the control.	qt6/src/qml/WindowButton.qml

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[deepin-ci-robot]

deepin pr auto review

我对这个代码变更进行了审查，以下是我的分析和改进建议：

1. 版权信息变更：

• 版权年份从 "2021 - 2022" 更新为 "2021 - 2026"
• 这是一个正常的版权信息更新，没有问题

2. 代码结构变更：

• 添加了 contentItem 属性，使用 D.DciIcon 替换了原来的默认图标显示
• 保留了原有的 icon 属性设置

3. 改进建议：

代码质量：

• 新增的 contentItem 实现合理，使用了 DTK 的图标组件，保持了与系统风格的一致性
• 异步加载设置 asynchronous: false 是明确的，避免了潜在的加载时序问题

代码性能：

• 设置了明确的 sourceSize 可以避免图标渲染时的缩放性能问题
• 使用 D.DTK.makeIconPalette 确保图标调色板正确，有助于提升渲染效率

代码安全：

• 使用了系统提供的调色板和主题设置，避免了硬编码的颜色值，提高了可维护性和安全性
• 通过 control.D.ColorSelector 获取控制状态和主题，确保了状态的一致性

潜在改进点：

1. 建议为 contentItem 添加错误处理机制，以防图标加载失败的情况
2. 考虑为 asynchronous: false 添加注释，说明为什么禁用异步加载（可能是为了确保界面同步更新）
3. 可以考虑将图标大小定义提取为可配置的常量，便于统一管理和调整

总体而言，这个代码变更是一个合理的改进，通过使用 DTK 的图标组件提升了系统的集成度和一致性。代码结构清晰，性能考虑周到，安全性有保障。

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: 18202781743, mhduiy

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