fix: optimize fullscreen launcher item sorting initialization

1. Replaced Component.onCompleted with sortColumn property in
FullscreenFrame.qml for ItemArrangementProxyModel
2. Added setSortColumn method to SortProxyModel to enable declarative
sorting in QML
3. Modified SortProxyModel to reorder items when sortColumn changes if
source model is already populated
4. Added conditional enabling of itemMoveTransition in FullscreenFrame
grid view Component.onCompleted

Log: Improved fullscreen launcher item sorting performance and stability

fix: 优化全屏启动器项目排序初始化

1. 在 FullscreenFrame.qml 中将 ItemArrangementProxyModel 的
Component.onCompleted 替换为 sortColumn 属性
2. 为 SortProxyModel 添加 setSortColumn 方法以支持在 QML 中声明式排序
3. 修改 SortProxyModel 在 sortColumn 变化时重新排序项目（如果源模型已
填充）
4. 在 FullscreenFrame 网格视图的 Component.onCompleted 中添加条件启用

sort(0)时，reorder() 会发出 beginMoveRows/endMoveRows 信号，与 GridView 的 displaced/move 动画冲突

根本解决方案：让排序在 setSourceModel() 的 beginResetModel/endResetModel 阶段就完成，这样视图第一次看到数据时就已经是排好序的，不会产生任何 move 信号。

做法：给 SortProxyModel 增加 sortColumn 的 Q_PROPERTY，在 QML 中声明式地设置 sortColumn: 0。QML 引擎会先设置简单值属性（sortColumn、sortRole），再设置复杂对象属性（sourceModel）。这样 rebuildRowMap() 执行m_sortColumn 已经是 0，数据在 reset 阶段就排好了。
Log: 改进全屏启动器项目排序性能和稳定性

Author: wjyrich

qml/FullscreenFrame.qml

@@ -419,9 +419,7 @@ InputEventItem {
                                 folderId: 0
                             }
                             sortRole: ItemArrangementProxyModel.IndexInPageRole
-                            Component.onCompleted: {
-                                proxyModel.sort(0)
-                            }
+                            sortColumn: 0
                         }
 
                         MouseArea {
@@ -666,6 +664,9 @@ InputEventItem {
                                 }
                             }
                             Component.onCompleted: {
+                                if (LauncherController.currentFrame === "FullscreenFrame") {
+                                    itemMoveTransition.enabled = true
+                                }
                                 gridViewContainer.checkPageSwitchState()
                             }
                             Component.onDestruction: {

src/models/sortproxymodel.cpp

@@ -196,6 +196,24 @@ void SortProxyModel::setSortRole(int role)
     }
 }
 
+void SortProxyModel::setSortColumn(int column)
+{
+    if (m_sortColumn != column)
+    {
+        int oldColumn = m_sortColumn;
+        m_sortColumn = column;
+        Q_EMIT sortColumnChanged();
+
+        // If source model is already set, reorder to apply the new sort column
+        if (sourceModel() && !m_proxyToSourceMap.empty())
+        {
+            reorder();
+        }
+
+        Q_UNUSED(oldColumn)
+    }
+}
+
 int SortProxyModel::sortRole() const
 {
     return m_sortRole;

src/models/sortproxymodel.h

@@ -30,12 +30,14 @@ class SortProxyModelTest;
  * of the API, so if you used QSortFilterProxyModel only for sorting it
  * should be a drop-in replacement.
  *
- * @note BLumia: Currently, sort() needs to be called manually
+ * @note sortColumn can be set declaratively in QML to enable
+ * initial sorting during model reset (no move signals emitted).
  */
 class SortProxyModel : public QAbstractProxyModel
 {
     Q_OBJECT
     Q_PROPERTY(int sortRole READ sortRole WRITE setSortRole NOTIFY sortRoleChanged)
+    Q_PROPERTY(int sortColumn READ sortColumn WRITE setSortColumn NOTIFY sortColumnChanged)
     QML_ELEMENT
 
 public:
@@ -60,6 +62,7 @@ class SortProxyModel : public QAbstractProxyModel
 public:
     void setSortRole(int role);
     int sortRole() const;
+    void setSortColumn(int column);
     void setSortCaseSensitivity(Qt::CaseSensitivity sensitivity);
     Qt::CaseSensitivity sortCaseSensitivity() const;
     int sortColumn() const;