fix: Finish button replaced with FAB

packages/smooth_app/lib/pages/product/add_new_product_page.dart

@@ -75,56 +75,44 @@ class _AddNewProductPageState extends State<AddNewProductPage> {
               start: VERY_LARGE_SPACE,
               end: VERY_LARGE_SPACE,
             ),
-            child: Stack(
-              children: <Widget>[
-                SingleChildScrollView(
-                  child: Column(
-                    crossAxisAlignment: CrossAxisAlignment.start,
-                    children: <Widget>[
-                      Text(
-                        appLocalizations.add_product_take_photos_descriptive,
-                        style: themeData.textTheme.bodyText1!
-                            .apply(color: themeData.colorScheme.onBackground),
-                      ),
-                      ..._buildImageCaptureRows(context),
-                      _buildNutritionInputButton(product),
-                      _buildaddInputDetailsButton()
-                    ],
+            child: SingleChildScrollView(
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: <Widget>[
+                  Text(
+                    appLocalizations.add_product_take_photos_descriptive,
+                    style: themeData.textTheme.bodyText1!
+                        .apply(color: themeData.colorScheme.onBackground),
                   ),
-                ),
-                Positioned(
-                  child: Align(
-                    alignment: Alignment.bottomCenter,
-                    child: SmoothActionButtonsBar.single(
-                      action: SmoothActionButton(
-                        text: appLocalizations.finish,
-                        onPressed: () async {
-                          final LocalDatabase localDatabase =
-                              context.read<LocalDatabase>();
-                          final DaoProduct daoProduct =
-                              DaoProduct(localDatabase);
-                          final Product? localProduct =
-                              await daoProduct.get(widget.barcode);
-                          if (localProduct == null) {
-                            product = Product(
-                              barcode: widget.barcode,
-                            );
-                            daoProduct.put(product);
-                            localDatabase.notifyListeners();
-                          }
-                          provider.set(product);
-                          if (mounted) {
-                            await Navigator.maybePop(context,
-                                _isProductLoaded ? widget.barcode : null);
-                          }
-                        },
-                      ),
-                    ),
-                  ),
-                ),
-              ],
+                  ..._buildImageCaptureRows(context),
+                  _buildNutritionInputButton(product),
+                  _buildaddInputDetailsButton()
+                ],
+              ),
             ),
           ),
+          floatingActionButton: FloatingActionButton.extended(
+            onPressed: () async {
+              final LocalDatabase localDatabase = context.read<LocalDatabase>();
+              final DaoProduct daoProduct = DaoProduct(localDatabase);
+              final Product? localProduct =
+                  await daoProduct.get(widget.barcode);
+              if (localProduct == null) {
+                product = Product(
+                  barcode: widget.barcode,
+                );
+                daoProduct.put(product);
+                localDatabase.notifyListeners();
+              }
+              provider.set(product);
+              if (mounted) {
+                await Navigator.maybePop(
+                    context, _isProductLoaded ? widget.barcode : null);
+              }
+            },
+            label: Text(appLocalizations.finish),
+            icon: const Icon(Icons.done),
+          ),
         );
       },
     );