add import export and items

lib/widgets/filament_form.dart

@@ -5,6 +5,7 @@ import 'package:intl/intl.dart';
 import '../controller/home_controller.dart';
 import '../theme/app_theme.dart';
 import '../helper/input_validators.dart';
+import 'filament_material_field.dart';
 
 class FilamentForm extends StatelessWidget {
   const FilamentForm({super.key, required this.controller});
@@ -130,29 +131,7 @@ class FilamentForm extends StatelessWidget {
                   : null,
             ),
             const SizedBox(height: 16),
-            Obx(
-              () => DropdownButtonFormField<String>(
-                key: ValueKey(
-                  '${controller.editingId.value ?? "new"}_${controller.material.value}',
-                ),
-                initialValue: controller.material.value,
-                isExpanded: true,
-                decoration: const InputDecoration(
-                  labelText: 'Material',
-                  prefixIcon: Icon(Icons.layers_outlined),
-                ),
-                items: controller.materialien
-                    .toSet()
-                    .map(
-                      (item) =>
-                          DropdownMenuItem(value: item, child: Text(item)),
-                    )
-                    .toList(),
-                onChanged: (value) {
-                  if (value != null) controller.material.value = value;
-                },
-              ),
-            ),
+            FilamentMaterialField(controller: controller),
             const SizedBox(height: 16),
             TextFormField(
               controller: controller.farbeController,