fix: pass control center help fallback candidates

1. Collect the active control center navigation object chain when opening help
2. Reuse the NavigationModel-style filter so only menu objects with display names are used as help candidates
3. Pass the ordered candidates to deepin-manual so child pages without sections can fall back to a parent topic

Influence:
1. Test help on input method add-ons to fall back to the input method topic
2. Verify shortcut and network child pages still open mapped manual sections
3. Verify the final debug-machine package contains no unrelated desktop file changes

fix: 控制中心帮助跳转传递父级候选链

1. 打开帮助时收集当前控制中心导航对象链
2. 复用 NavigationModel 风格过滤，只使用带显示名称的菜单对象作为帮助候选项
3. 传递有序候选列表，使没有手册章节的子页面可以回退到父级主题

Influence:
1. 测试输入法附加组件帮助可回退到输入法主题
2. 验证快捷键和网络子页面仍可打开对应手册章节
3. 验证最终调试机包不包含无关 desktop 文件改动

PMS: BUG-368805

Author: robertkill

src/dde-control-center/dccmanager.cpp

@@ -319,11 +319,19 @@ QWindow *DccManager::mainWindow() const
 
 void DccManager::showHelp()
 {
-    QString helpTitle;
-    if (1 < m_currentObjects.count())
-        helpTitle = m_currentObjects.last()->name();
-    if (helpTitle.isEmpty())
-        helpTitle = "controlcenter";
+    QStringList helpTitles;
+    for (auto it = m_currentObjects.crbegin(); it != m_currentObjects.crend(); ++it) {
+        DccObject *object = *it;
+        if (!object || object == m_root)
+            continue;
+
+        if (!(object->pageType() & DccObject::PageType::Menu) || object->displayName().isEmpty())
+            continue;
+
+        helpTitles.append(object->name());
+    }
+
+    const QString helpTitle = helpTitles.isEmpty() ? QStringLiteral("controlcenter") : helpTitles.join(QChar(0x1f));
 
     const QString &dmanInterface = "com.deepin.Manual.Open";
     QDBusMessage message = QDBusMessage::createMethodCall(dmanInterface, "/com/deepin/Manual/Open", dmanInterface, "OpenTitle");