fix(ui): enable QPainter antialiasing for Qt6 build

[add-uos]

Add QPainter::Antialiasing render hint for switchcamerabtn and takephotosettingareawidget, which were missing it under Qt6.

Qt6下switchcamerabtn和takephotosettingareawidget的paintEvent 未设置抗锯齿，导致圆形边框绘制出现锯齿。

Log: Qt6下开启抗锯齿修复边框锯齿
Influence: 修复Qt6下切换摄像头按钮和拍照设置区域边框锯齿问题，提升显示效果。

Summary by Sourcery

Enable antialiasing for the affected widgets to improve border rendering in Qt6 builds.

Bug Fixes:

• Fix jagged circular borders in the camera-switch button and photo-settings area when built with Qt6 by enabling painter antialiasing.

Chores:

• Update copyright year ranges in the affected source files.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The PR fixes jagged circular borders in Qt6 by enabling QPainter antialiasing for the switch-camera button and photo-setting-area widget while preserving the existing Qt5 rendering hint behavior.

Sequence diagram for Qt6 widget painting with antialiasing

sequenceDiagram
    participant Qt as QtPaintSystem
    participant SwitchCameraBtn
    participant PhotoSettingAreaWidget
    participant QPainter

    Qt->>SwitchCameraBtn: paintEvent(QPaintEvent)
    SwitchCameraBtn->>QPainter: setRenderHint(QPainter::Antialiasing, true)
    QPainter-->>SwitchCameraBtn: Paint circular border smoothly

    Qt->>PhotoSettingAreaWidget: paintEvent(QPaintEvent)
    PhotoSettingAreaWidget->>QPainter: setRenderHint(QPainter::Antialiasing, true)
    QPainter-->>PhotoSettingAreaWidget: Paint circular border smoothly

    alt Qt5 build
        SwitchCameraBtn->>QPainter: setRenderHint(QPainter::HighQualityAntialiasing, true)
        PhotoSettingAreaWidget->>QPainter: setRenderHint(QPainter::HighQualityAntialiasing, true)
    end

Loading

File-Level Changes

Change	Details	Files
Enable QPainter antialiasing in the two affected widget paint paths so circular borders render smoothly in Qt6.	Set the QPainter::Antialiasing render hint in each paintEvent. Retain the Qt5-specific HighQualityAntialiasing hint for backward compatibility.	src/src/switchcamerabtn.cpp src/src/takephotosettingareawidget.cpp
Update copyright year ranges in the modified source files.	Extend copyright notices through 2026.	src/src/switchcamerabtn.cpp src/src/takephotosettingareawidget.cpp

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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

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• debian/deepin/OWNERS

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[add-uos]

/merge