feat: add icon scaling with keyboard shortcuts

1. Added icon scaling functionality with Ctrl++/Ctrl+= to zoom in and
Ctrl+- to zoom out
2. Implemented smooth scaling animation with 200ms duration and easing
3. Set scaling limits between 0.5x and 1.0x with 0.1x step increments
4. Updated IconItemDelegate to support iconScaleFactor property for
consistent scaling
5. Added transformOrigin: Item.Center to maintain icon positioning
during scaling

feat: 添加图标缩放功能和键盘快捷键

1. 添加图标缩放功能，支持 Ctrl++/Ctrl+= 放大和 Ctrl+- 缩小
2. 实现平滑缩放动画，持续时间为200毫秒并带有缓动效果
3. 设置缩放限制在0.5倍到1.0倍之间，每次调整0.1倍
4. 更新IconItemDelegate以支持iconScaleFactor属性，确保缩放一致性
5. 添加transformOrigin: Item.Center以在缩放过程中保持图标定位

Pms: BUG-289529

Author: wjyrich

qml/FullscreenFrame.qml

@@ -19,6 +19,16 @@ InputEventItem {
     anchors.fill: parent
     objectName: "FullscreenFrame-InputEventItem"
 
+    property real iconScaleFactor: 1.0
+    
+    // 缩放动画
+    Behavior on iconScaleFactor {
+        NumberAnimation {
+            duration: 200
+            easing.type: Easing.OutQuad
+        }
+    }
+    
     property Palette appTextColor: Palette {
         normal {
             common: Qt.rgba(0, 0, 0, 1)
@@ -75,6 +85,26 @@ InputEventItem {
             onActivatedAmbiguously: LauncherController.showHelp()
         }
 
+        Shortcut {
+            context: Qt.ApplicationShortcut
+            sequences: ["Ctrl++", "Ctrl+="]
+            onActivated: {
+                if (iconScaleFactor < 1.0) {
+                    iconScaleFactor = Math.min(iconScaleFactor + 0.1, 1.0)
+                }
+            }
+        }
+
+        Shortcut {
+            context: Qt.ApplicationShortcut
+            sequences: ["Ctrl+-"]
+            onActivated: {
+                if (iconScaleFactor > 0.5) {
+                    iconScaleFactor = Math.max(iconScaleFactor - 0.1, 0.5)
+                }
+            }
+        }
+
         readonly property bool isHorizontalDock: DesktopIntegration.dockPosition === Qt.UpArrow || DesktopIntegration.dockPosition === Qt.DownArrow
         readonly property int dockSpacing: (isHorizontalDock ? DesktopIntegration.dockGeometry.height : DesktopIntegration.dockGeometry.width) / Screen.devicePixelRatio
 
@@ -490,6 +520,8 @@ InputEventItem {
                                     visible: dndItem.currentlyDraggedId !== model.desktopId
                                     iconSource: (iconName && iconName !== "") ? iconName : "application-x-desktop"
                                     icons: folderIcons
+                                    iconScaleFactor: baseLayer.parent.iconScaleFactor
+                                    transformOrigin: Item.Center
                                     onItemClicked: {
                                         launchApp(desktopId)
                                     }
@@ -562,6 +594,8 @@ InputEventItem {
                         width: searchResultGridViewContainer.cellWidth
                         height: searchResultGridViewContainer.cellHeight
                         padding: 5
+                        iconScaleFactor: baseLayer.parent.iconScaleFactor
+                        transformOrigin: Item.Center
                         onItemClicked: {
                             launchApp(desktopId)
                         }

qml/IconItemDelegate.qml

@@ -30,6 +30,7 @@ Control {
     property bool dndEnabled: false
     readonly property bool isWindowedMode: LauncherController.currentFrame === "WindowedFrame"
     property alias displayFont: iconItemLabel.font
+    property real iconScaleFactor: 1.0
 
     Accessible.name: iconItemLabel.text
 
@@ -144,7 +145,7 @@ Control {
 
                                     name: modelData
                                     sourceSize: Qt.size(root.maxIconSizeInFolder, root.maxIconSizeInFolder)
-                                    scale: parent.width / 2 / root.maxIconSizeInFolder
+                                    scale: (parent.width / 2 / root.maxIconSizeInFolder) * root.iconScaleFactor
                                     palette: DTK.makeIconPalette(root.palette)
                                     theme: ApplicationHelper.DarkType
                                 }
@@ -174,7 +175,7 @@ Control {
                         anchors.fill: parent
                         name: iconSource
                         sourceSize: Qt.size(root.maxIconSize, root.maxIconSize)
-                        scale: parent.width / root.maxIconSize
+                        scale: (parent.width / root.maxIconSize) * root.iconScaleFactor
                         palette: DTK.makeIconPalette(root.palette)
                         theme: ApplicationHelper.DarkType
                     }