refactor: replace DIconButton with DToolButton for calendar navigation

1. Changed DIconButton to DToolButton for next/previous page buttons in
calendar widget
2. Updated both implementation (.cpp) and header (.h) files
3. This change provides better visual consistency with the Deepin design
system
4. DToolButton offers more styling options and better fits the calendar
navigation use case

refactor: 将日历导航按钮从DIconButton替换为DToolButton

1. 将日历组件中的下一页/上一页按钮从DIconButton改为DToolButton
2. 同时更新了实现文件(.cpp)和头文件(.h)
3. 此更改提供了与Deepin设计系统更好的视觉一致性
4. DToolButton提供更多样式选项，更适合日历导航的使用场景

pms:BUG-305191

Author: 18202781743

plugins/dde-dock/datetime/calendar/sidebarcalendarwidget.cpp

@@ -27,8 +27,8 @@ SidebarCalendarWidget::SidebarCalendarWidget(RegionFormat *regionFormat, QWidget
     , m_keyWidget(new QWidget(this))
     , m_keyLayout(new QGridLayout)
     , m_dateLabel(new QLabel(this))
-    , m_nextPage(new DIconButton(this))
-    , m_previousPage(new DIconButton(this))
+    , m_nextPage(new DToolButton(this))
+    , m_previousPage(new DToolButton(this))
     , m_firstday(Qt::Sunday)
     , m_dateTitleWidget(new DateTitleWidget(this))
     , m_weekLabel(new DLabel(this))

plugins/dde-dock/datetime/calendar/sidebarcalendarwidget.h

@@ -10,7 +10,7 @@
 #include "calendarmanager.h"
 
 #include <DLabel>
-#include <DIconButton>
+#include <DToolButton>
 #include <DFontSizeManager>
 #include <DCommandLinkButton>
 
@@ -99,8 +99,8 @@ private slots:
     QWidget* m_keyWidget;                               //日期按钮区域控件
     QGridLayout* m_keyLayout;                           //按钮布局
     QLabel* m_dateLabel;                                //头部日期显示label
-    DIconButton* m_nextPage;                            //下一页切换按键
-    DIconButton* m_previousPage;                        //上一页切换按键
+    DToolButton* m_nextPage;                            //下一页切换按键
+    DToolButton* m_previousPage;                        //上一页切换按键
     QList<SidebarCalendarKeyButton*> m_keyButtonList;   //所有的日期按钮控件
     int m_firstday;
     DateTitleWidget *m_dateTitleWidget;