feat:增加统计图表模块

lib/pages/calendar_page.dart

@@ -54,8 +54,8 @@ class CalendarPageState extends State<CalendarPage> {
   void _showDialog(bool isEditing, Calendar? calendar) {
     final provider = Provider.of<CalendarProvider>(context, listen: false);
 
-    if (isEditing) {
-      provider.initForm(calendar!);
+    if (calendar != null) {
+      provider.initForm(calendar);
     } else {
       provider.resetForm();
     }
@@ -153,7 +153,7 @@ class CalendarPageState extends State<CalendarPage> {
               dataSource: AppointmentDataSource(_appointments),
               onAdd: () {
                 if (_calendarController.view == CalendarView.week) {
-                  _showDialog(true, provider.formItem);
+                  _showDialog(false, provider.formItem);
                 }
               },
               onEdit: (appointment) {