fix: Stationsabschluss absichern und Kundenformulare anpassen

Sperrt nachträgliche Aufgabenabschlüsse in App und Backend und zeigt erledigte Aufträge trotz offener optionaler Aufgaben grün an. Ergänzt Regressionstests, die Anredeauswahl und optionale Steuerangaben für Kunden. Enthält App-Version 0.9.25, Backend-Version 0.9.26 und das aktualisierte Frontend-Bundle.

app/lib/cargo_items_view.dart

@@ -6,6 +6,7 @@ import 'l10n/app_localizations.dart';
 import 'l10n/localization_helpers.dart';
 import 'models/delivery_station.dart';
 import 'models/job.dart';
+import 'models/job_progress.dart';
 import 'services/database_service.dart';
 import 'task_view.dart';
 import 'widgets/offline_banner.dart';
@@ -13,8 +14,10 @@ import 'widgets/offline_banner.dart';
 @visibleForTesting
 Color? deliveryStationCardBackgroundColor(
   DeliveryStation station,
-  Map<String, bool> taskStatuses,
-) {
+  Map<String, bool> taskStatuses, {
+  bool isClosed = false,
+}) {
+  if (isClosed) return AppColors.successSoft;
   if (station.tasks.isEmpty) {
     return null;
   }
@@ -37,6 +40,7 @@ class CargoItemsView extends StatefulWidget {
 class _CargoItemsViewState extends State<CargoItemsView> {
   final DatabaseService _databaseService = DatabaseService();
   Map<String, bool> _taskStatuses = const {};
+  Set<int> _completedStations = const {};
 
   @override
   void initState() {
@@ -46,9 +50,13 @@ class _CargoItemsViewState extends State<CargoItemsView> {
 
   Future<void> _loadLocalTaskStatuses() async {
     final map = await _databaseService.loadAllTaskStatuses();
+    final completedStations = await _databaseService.loadCompletedStationOrders(
+      widget.job,
+    );
     if (!mounted) return;
     setState(() {
       _taskStatuses = map;
+      _completedStations = completedStations;
     });
   }
 
@@ -311,6 +319,11 @@ class _CargoItemsViewState extends State<CargoItemsView> {
     final backgroundColor = deliveryStationCardBackgroundColor(
       station,
       _taskStatuses,
+      isClosed: JobProgress(
+        widget.job,
+        taskStatuses: _taskStatuses,
+        localCompletedStations: _completedStations,
+      ).isStationClosed(station.stationOrder),
     );
     final title =
         station.displayName.isNotEmpty ? station.displayName : station.company;