feat: Added left and right button switching in full-screen mode.

Also fix bug, when first open launchpad, open show focus in first app.

PMS-BUG-289119

Author: wjyrich

qml/FullscreenFrame.qml

@@ -380,7 +380,10 @@ InputEventItem {
                                 } else {
                                     gridViewContainer.setPreviousPageSwitch(false)
                                 }
-                                listviewPage.previousIndex = listviewPage.currentIndex
+                                // 延迟更新previousIndex，避免重复处理
+                                Qt.callLater(function() {
+                                    listviewPage.previousIndex = listviewPage.currentIndex
+                                })
                             }
 
                             Keys.onLeftPressed: function(event) {
@@ -394,7 +397,7 @@ InputEventItem {
                             }
                             Keys.onRightPressed: function(event) {
                                 if (listItem.viewIndex === (itemPageModel.rowCount() - 1) && itemPageModel.rowCount() > 1) {
-                                    // is the last page, go to last page
+                                    // is the last page, go to first page
                                     listviewPage.setCurrentIndex(0)
                                 } else {
                                     // not the last page, simply use SwipeView default behavior

qml/GridViewContainer.qml

@@ -122,7 +122,7 @@ FocusScope {
                     Rectangle {
                         anchors {
                             fill: parent
-                            margins: 5    
+                            margins: 5
                         }
                         radius: 18
                         color: Qt.rgba(0, 0, 0, 0.2)
@@ -135,16 +135,6 @@ FocusScope {
                 // not wroking
                 move: root.itemMove
                 moveDisplaced: root.itemMove
-
-                Keys.onPressed: function (event) {
-                    if (event.key === Qt.Key_Right && currentIndex === gridView.count - 1) {
-                        gridView.currentIndex = 0;
-                        event.accepted = true;
-                    } else if (event.key === Qt.Key_Left && currentIndex === 0) {
-                        currentIndex = gridView.count - 1;
-                        event.accepted = true;
-                    }
-                }
             }
         }