add import export and items

lib/widgets/anwendung_form.dart

@@ -13,7 +13,7 @@ class AnwendungForm extends StatelessWidget {
   Widget build(BuildContext context) {
     final filament = controller.filament.value!;
     return EntryPanel(
-      title: 'Verarbeitung erfassen',
+      title: 'Verarbeitungsprofil bearbeiten',
       subtitle:
           '${filament.marke} · ${filament.material} · ${filament.farbe}\n'
           'Speichere die Einstellungen für dieses Filament als Profil.',

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,

lib/widgets/filament_material_field.dart

@@ -0,0 +1,126 @@
+import 'package:flutter/material.dart';
+import 'package:get/get.dart';
+
+import '../controller/home_controller.dart';
+
+class FilamentMaterialField extends StatelessWidget {
+  const FilamentMaterialField({super.key, required this.controller});
+
+  final HomeController controller;
+
+  @override
+  Widget build(BuildContext context) => Column(
+    crossAxisAlignment: CrossAxisAlignment.stretch,
+    children: [
+      TextFormField(
+        controller: controller.materialController,
+        onChanged: (value) => controller.material.value = value,
+        validator: (value) => value == null || value.trim().isEmpty
+            ? 'Materialart eingeben oder auswählen'
+            : null,
+        decoration: InputDecoration(
+          labelText: 'Material',
+          helperText: 'Auswählen oder eigene Art eingeben',
+          prefixIcon: const Icon(Icons.layers_outlined),
+          suffixIcon: Obx(
+            () => PopupMenuButton<String>(
+              tooltip: 'Material auswählen',
+              enabled: controller.materialien.isNotEmpty,
+              icon: const Icon(Icons.expand_more),
+              onSelected: controller.selectMaterial,
+              itemBuilder: (context) => controller.materialien
+                  .map((item) => PopupMenuItem(value: item, child: Text(item)))
+                  .toList(),
+            ),
+          ),
+        ),
+      ),
+      Obx(
+        () => Wrap(
+          spacing: 8,
+          children: [
+            TextButton.icon(
+              onPressed: controller.isSavingMaterial.value
+                  ? null
+                  : () async {
+                      if (await controller.addMaterial() && context.mounted) {
+                        ScaffoldMessenger.of(context).showSnackBar(
+                          const SnackBar(
+                            content: Text('Art ist in der Liste.'),
+                          ),
+                        );
+                      }
+                    },
+              icon: const Icon(Icons.add),
+              label: const Text('Art hinzufügen'),
+            ),
+            TextButton.icon(
+              onPressed: () => _manage(context),
+              icon: const Icon(Icons.tune),
+              label: const Text('Arten verwalten'),
+            ),
+          ],
+        ),
+      ),
+      _message(),
+    ],
+  );
+
+  Widget _message() => Obx(() {
+    final message = controller.materialMessage.value;
+    return message == null
+        ? const SizedBox.shrink()
+        : Text(message, style: const TextStyle(color: Colors.red));
+  });
+
+  Future<void> _manage(BuildContext context) => showDialog<void>(
+    context: context,
+    builder: (context) => AlertDialog(
+      title: const Text('Materialarten verwalten'),
+      content: SizedBox(
+        width: 360,
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.stretch,
+          children: [
+            const Text(
+              'Entfernte Arten verschwinden aus der Auswahl. Gespeicherte Filamente bleiben erhalten.',
+            ),
+            const SizedBox(height: 12),
+            Flexible(
+              child: Obx(() {
+                final values = controller.materialien.toList();
+                final busy = controller.isSavingMaterial.value;
+                if (values.isEmpty) {
+                  return const Text('Keine Materialarten in der Liste.');
+                }
+                return ListView.builder(
+                  shrinkWrap: true,
+                  itemCount: values.length,
+                  itemBuilder: (context, index) => ListTile(
+                    contentPadding: EdgeInsets.zero,
+                    title: Text(values[index]),
+                    trailing: IconButton(
+                      tooltip: '${values[index]} aus Liste entfernen',
+                      icon: const Icon(Icons.delete_outline),
+                      onPressed: busy
+                          ? null
+                          : () => controller.removeMaterial(values[index]),
+                    ),
+                  ),
+                );
+              }),
+            ),
+            _message(),
+          ],
+        ),
+      ),
+      actions: [
+        TextButton(
+          onPressed: () => Navigator.of(context).pop(),
+          child: const Text('Schließen'),
+        ),
+      ],
+    ),
+  );
+}