feat: erweiterte Chat-Funktionalität, UI-Verbesserungen und Lokalisierungsupdates

- Chat: Nachrichten-Status (read/unread), WebSocket-Verbesserungen
- App: Login-Optimierung, Job-Übersicht verbessert, neue Übersetzungen
- Backend: Dialog-Styling, Invoice-Generator, Job-Verwaltung erweitert
- Mehrsprachigkeit: Neue Übersetzungen für DE, EN, ES, ET, FR, LT, LV, PL, RU, TR

app/lib/l10n/app_localizations.dart

@@ -11,15 +11,28 @@ import 'app_localizations_lv.dart';
 import 'app_localizations_lt.dart';
 
 /// Supported language codes
-const List<String> supportedLanguageCodes = ['de', 'en', 'es', 'fr', 'pl', 'ru', 'tr', 'et', 'lv', 'lt'];
+const List<String> supportedLanguageCodes = [
+  'de',
+  'en',
+  'es',
+  'fr',
+  'pl',
+  'ru',
+  'tr',
+  'et',
+  'lv',
+  'lt',
+];
 
 /// AppLocalizations provides localized strings for the app
 abstract class AppLocalizations {
   static AppLocalizations of(BuildContext context) {
-    return Localizations.of<AppLocalizations>(context, AppLocalizations) ?? AppLocalizationsDe();
+    return Localizations.of<AppLocalizations>(context, AppLocalizations) ??
+        AppLocalizationsDe();
   }
 
-  static const LocalizationsDelegate<AppLocalizations> delegate = _AppLocalizationsDelegate();
+  static const LocalizationsDelegate<AppLocalizations> delegate =
+      _AppLocalizationsDelegate();
 
   /// Language name
   String get languageName;
@@ -41,6 +54,7 @@ abstract class AppLocalizations {
   String get refresh;
   String get version;
   String get unknown;
+  String get yesterday;
 
   // ==================== NAVIGATION ====================
   String get jobs;
@@ -58,7 +72,14 @@ abstract class AppLocalizations {
   String get welcomeBack;
   String get loginSubtitle;
   String get email;
+  String get emailAddress;
+  String get emailAddressHint;
+  String get emailAddressRequired;
+  String get emailAddressInvalid;
   String get password;
+  String get passwordHint;
+  String get passwordRequired;
+  String get passwordMinLength;
   String get login;
   String get loggingIn;
   String get forgotPassword;
@@ -101,6 +122,15 @@ abstract class AppLocalizations {
   String get deleteJob;
   String get jobRemoved;
   String get newJobReceived;
+  String get jobDetails;
+  String get jobTasks;
+  String get deliveryStations;
+  String deliveryStationsCount(int count);
+  String get noDeliveryStations;
+  String get noDeliveryStationsMessage;
+  String get phone;
+  String get unnamedStation;
+  String stationNumber(int number);
 
   // ==================== TASKS ====================
   String get tasks;
@@ -182,6 +212,9 @@ abstract class AppLocalizations {
   String get chatTypeGeneral;
   String get jobNumber;
   String get messages;
+  String get generalMessages;
+  String get noMessagesYet;
+  String get noChatsAvailable;
   String get selectPhoto;
   String get unreadMessages;
 
@@ -217,16 +250,20 @@ abstract class AppLocalizations {
 
   // ==================== STATUS ====================
   String get statusCreated;
+  String get statusPending;
   String get statusAssigned;
   String get statusInProgress;
   String get statusCompleted;
+  String get statusCancelled;
+  String get statusFailed;
   String get priorityLow;
   String get priorityMedium;
   String get priorityHigh;
   String get priorityUrgent;
 }
 
-class _AppLocalizationsDelegate extends LocalizationsDelegate<AppLocalizations> {
+class _AppLocalizationsDelegate
+    extends LocalizationsDelegate<AppLocalizations> {
   const _AppLocalizationsDelegate();
 
   @override