backend news category with default

app/Filament/Resources/NewsResource.php

                     Group::make()->schema([
                         DatePicker::make('post_date')
                         ->label("發布日期")
-                        ->closeOnDateSelection(),
+                        ->closeOnDateSelection()->required(),
                     ])->columnSpanFull()->columns(2),
                     FileUpload::make('news_img_pc')->label("列表圖(desktop)")
                     ->disk("public")