feat:增加待办提醒功能

lib/widgets/common.dart

@@ -79,6 +79,9 @@ Widget buildOmniDateButton({
     onPressed: () async {
       final DateTime? picked = await showOmniDateTimePicker(
         context: context,
+        constraints: const BoxConstraints(
+          maxWidth: 400,
+        ),
         initialDate: selectedDate ?? DateTime.now(),
         firstDate: DateTime(
           DateTime.now().year,