fix: align release date and expand button in update list

Added flexible spacer items to properly separate release time text from
tool buttons in the update list layout, ensuring consistent alignment
across different list items.

Log: Fixed UI alignment in update list

Influence:
1. Verify release time text and expand button are properly separated
2. Test on different screen sizes and resolutions
3. Check alignment consistency across all list items

fix: 修复更新列表中发布日期和展开按钮的对齐问题

在更新列表布局中添加弹性分隔项，确保发布日期文本与工具按钮正确分离，保持
列表项间对齐一致性。

Log: 修复更新列表UI对齐问题

Influence:
1. 验证发布日期文本和展开按钮是否适当分离
2. 在不同屏幕尺寸和分辨率下测试
3. 检查所有列表项之间的对齐一致性

PMS: BUG-362721

Author: xujin177

src/dcc-update-plugin/qml/UpdateList.qml

@@ -117,6 +117,10 @@ Rectangle {
                                 text: qsTr("Release time:") + model.releaseTime
                             }
 
+                            Item {
+                                Layout.fillWidth: true
+                            }
+
                             D.ToolButton {
                                 textColor: D.Palette {
                                     normal {
@@ -193,6 +197,10 @@ Rectangle {
                                         text: qsTr("Release time:") + modelData.updateTime
                                     }
 
+                                    Item {
+                                        Layout.fillWidth: true
+                                    }
+
                                     D.ToolButton {
                                         textColor: D.Palette {
                                             normal {