refactor: optimize hidden files toggle logic

1. Refactor toggleHiddenFiles() implementation to use Application generic attribute
2. Remove redundant view operations when toggling hidden files
3. Fix code format for case statements

Log: The changes simplify the hidden files toggle mechanism by directly operating on
the Application level attribute instead of manipulating view components. This
provides a more maintainable and cleaner approach.

src/plugins/filemanager/dfmplugin-workspace/utils/shortcuthelper.cpp

@@ -132,7 +132,7 @@ void ShortcutHelper::initRenameProcessTimer()
     renameProcessTimer->setSingleShot(true);
     renameProcessTimer->setInterval(500);
 
-    connect(renameProcessTimer, &QTimer::timeout, this, [ = ]{
+    connect(renameProcessTimer, &QTimer::timeout, this, [=] {
         if (enterTriggerFlag) {
             enterTriggerFlag = false;
 
@@ -177,13 +177,11 @@ bool ShortcutHelper::processKeyPressEvent(QKeyEvent *event)
             openAction(view->selectedUrlList());
             return true;
         }
-        case Qt::Key_D:
-        {
+        case Qt::Key_D: {
             moveToTrash();
             return true;
         }
-        case Qt::Key_Y:
-        {
+        case Qt::Key_Y: {
             // redo
             redoFiles();
             return true;
@@ -332,12 +330,8 @@ void ShortcutHelper::touchFolder()
 
 void ShortcutHelper::toggleHiddenFiles()
 {
-    // Todo(yanghao)
-    //  Todo(yanghao): preSelectionUrls
-    //  d->preSelectionUrls = urls;
-    view->itemDelegate()->hideAllIIndexWidget();
-    view->clearSelection();
-    view->model()->toggleHiddenFiles();
+    bool isShowedHiddenFiles = Application::instance()->genericAttribute(Application::kShowedHiddenFiles).toBool();
+    Application::instance()->setGenericAttribute(Application::kShowedHiddenFiles, !isShowedHiddenFiles);
 }
 
 void ShortcutHelper::showFilesProperty()