feat: add tab focus support for CheckBox and RadioButton

1. Added focusPolicy: Qt.TabFocus to both CheckBox.qml and
RadioButton.qml components
2. This change enables keyboard navigation via tab key for better
accessibility
3. Previously these components couldn't receive focus through tab
navigation
4. Improves user experience for keyboard-only users and accessibility
compliance

feat: 为复选框和单选按钮添加标签页焦点支持

1. 在 CheckBox.qml 和 RadioButton.qml 组件中添加了 focusPolicy:
Qt.TabFocus
2. 此更改使得可以通过Tab键进行键盘导航，提高可访问性
3. 之前这些组件无法通过Tab导航获取焦点
4. 改善了仅使用键盘用户的体验并提高可访问性合规性

pms: BUG-317505

Author: 18202781743

qt6/src/qml/CheckBox.qml

@@ -25,6 +25,7 @@ T.CheckBox {
     opacity: D.ColorSelector.controlState === D.DTK.DisabledState ? 0.4 : 1
     D.DciIcon.mode: D.ColorSelector.controlState
     D.DciIcon.theme: D.ColorSelector.controlTheme
+    focusPolicy: Qt.TabFocus
     indicator: Item {
         x: control.text ? (!control.mirrored ? control.leftPadding : control.width - width - control.rightPadding) : control.leftPadding + (control.availableWidth - width) / 2
         y: control.topPadding + (control.availableHeight - height) / 2

qt6/src/qml/RadioButton.qml

@@ -20,6 +20,7 @@ T.RadioButton {
     opacity: D.ColorSelector.controlState === D.DTK.DisabledState ? 0.4 : 1
     D.DciIcon.mode: D.ColorSelector.controlState
     D.DciIcon.theme: D.ColorSelector.controlTheme
+    focusPolicy: Qt.TabFocus
     icon {
         width: DS.Style.radioButton.iconSize
         height: DS.Style.radioButton.iconSize