add signin function

lib/widget/products.dart

@@ -7,7 +7,7 @@ import 'package:provider/provider.dart';
 import 'package:fcs/charts/lines.dart';
 import 'package:fcs/model/main_model.dart';
 import 'package:fcs/pages/po/po_submission_form.dart';
-import 'package:fcs/theme/theme.dart';
+import 'package:fcs/fcs/common/theme.dart';
 import 'package:fcs/vo/product.dart';
 import 'package:fcs/widget/local_text.dart';
 import 'package:fcs/widget/localization/app_translations.dart';
@@ -119,7 +119,7 @@ class _ProductsWidgetState extends State<ProductsWidget> {
                           Spacer(),
                           Container(
                             alignment: Alignment.bottomRight,
-                            padding: EdgeInsets.only(right: 15,bottom: 5),
+                            padding: EdgeInsets.only(right: 15, bottom: 5),
                             child: InkWell(
                               onTap: () => {
                                 Navigator.of(context).push(MaterialPageRoute(