fix: use application theme window radius and listen for changes

[18202781743]

变更说明

使用应用主题设置窗口圆角并监听变化

修改内容

1. 从 DGuiApplicationHelper::applicationTheme() 获取 windowRadius
2. 通过 DPlatformWindowHandle::setWindowRadius() 设置窗口圆角
3. 监听 DPlatformTheme::windowRadiusChanged 信号实时更新

测试验证

1. 验证窗口圆角与当前应用主题设置一致
2. 测试应用主题更新时圆角变化
3. 验证圆角实时应用到窗口
4. 检查圆角变化过程中无视觉异常

关联 Issues

• PMS: BUG-289145

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🤖 Generated with Claude Code

Summary by Sourcery

Align window corner radius with the current application theme and keep it in sync with theme changes.

Enhancements:

• Initialize the main window's corner radius from the application theme instead of the window handle default.
• Automatically update the window's corner radius when the application theme's window radius setting changes.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Aligns the main window’s corner radius with the application theme and keeps it updated when the theme’s window radius changes.

Sequence diagram for window radius updates from application theme

sequenceDiagram
    participant DGuiApplicationHelper
    participant DPlatformTheme
    participant MainWindow
    participant DPlatformWindowHandle

    rect rgb(230,230,230)
        MainWindow->>DGuiApplicationHelper: instance()
        DGuiApplicationHelper-->>MainWindow: DGuiApplicationHelper*
        MainWindow->>DGuiApplicationHelper: applicationTheme()
        DGuiApplicationHelper-->>MainWindow: DPlatformTheme*
        MainWindow->>DPlatformTheme: windowRadius()
        DPlatformTheme-->>MainWindow: int
        MainWindow->>DPlatformWindowHandle: setWindowRadius(m_cornerRadius)
    end

    rect rgb(230,230,230)
        DPlatformTheme-->>MainWindow: windowRadiusChanged(newRadius)
        alt [m_cornerRadius != newRadius]
            MainWindow->>MainWindow: update m_cornerRadius
            MainWindow->>DPlatformWindowHandle: setWindowRadius(m_cornerRadius)
            MainWindow->>MainWindow: update()
        end
    end

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File-Level Changes

Change	Details	Files
Initialize the main window’s corner radius from the application theme and apply it to the platform window handle.	Include DPlatformTheme to access theme-related window radius information. In initUI, obtain the DPlatformTheme from DGuiApplicationHelper::applicationTheme(). Read the window radius from the theme instead of from the window handle and store it in m_cornerRadius. Immediately apply the retrieved radius to the platform window via m_windowHandle->setWindowRadius().	dde-clipboard/mainwindow.cpp
Listen for application theme window radius changes and update the window accordingly at runtime.	In initConnect, obtain the current DPlatformTheme from DGuiApplicationHelper::applicationTheme(). Connect the DPlatformTheme::windowRadiusChanged signal to a lambda on MainWindow that receives the new radius. Skip updates when the radius is unchanged to avoid redundant work. On radius change, update m_cornerRadius, call m_windowHandle->setWindowRadius, and trigger repaint via update().	dde-clipboard/mainwindow.cpp

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[sourcery-ai]

Hey - I've left some high level feedback:

• You call DGuiApplicationHelper::instance()->applicationTheme() twice in initUI and initConnect; consider retrieving the theme once (or storing it as a member) and reusing it to avoid duplication and potential inconsistencies if the theme object changes.
• Before using theme in both initUI and initConnect, consider guarding against a null applicationTheme() pointer to avoid crashes in case it is not available in some environments.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- You call `DGuiApplicationHelper::instance()->applicationTheme()` twice in `initUI` and `initConnect`; consider retrieving the theme once (or storing it as a member) and reusing it to avoid duplication and potential inconsistencies if the theme object changes.
- Before using `theme` in both `initUI` and `initConnect`, consider guarding against a null `applicationTheme()` pointer to avoid crashes in case it is not available in some environments.

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