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_en.dart

@@ -47,6 +47,9 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get unknown => 'Unknown';
 
+  @override
+  String get yesterday => 'Yesterday';
+
   // ==================== NAVIGATION ====================
   @override
   String get jobs => 'Jobs';
@@ -88,9 +91,30 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get email => 'Email';
 
+  @override
+  String get emailAddress => 'Email Address';
+
+  @override
+  String get emailAddressHint => 'Enter your email address';
+
+  @override
+  String get emailAddressRequired => 'Please enter your email address';
+
+  @override
+  String get emailAddressInvalid => 'Please enter a valid email address';
+
   @override
   String get password => 'Password';
 
+  @override
+  String get passwordHint => 'Enter your password';
+
+  @override
+  String get passwordRequired => 'Please enter your password';
+
+  @override
+  String get passwordMinLength => 'Password must be at least 6 characters long';
+
   @override
   String get login => 'Login';
 
@@ -101,7 +125,8 @@ class AppLocalizationsEn extends AppLocalizations {
   String get forgotPassword => 'Forgot Password?';
 
   @override
-  String get forgotPasswordMessage => 'Forgot password feature not yet implemented';
+  String get forgotPasswordMessage =>
+      'Forgot password feature not yet implemented';
 
   @override
   String get loginSuccess => 'Successfully logged out';
@@ -212,6 +237,34 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get newJobReceived => 'New job received';
 
+  @override
+  String get jobDetails => 'Job Details';
+
+  @override
+  String get jobTasks => 'Job Tasks';
+
+  @override
+  String get deliveryStations => 'Delivery Stations';
+
+  @override
+  String deliveryStationsCount(int count) => 'Delivery Stations ($count)';
+
+  @override
+  String get noDeliveryStations => 'No Delivery Stations';
+
+  @override
+  String get noDeliveryStationsMessage =>
+      'This job currently contains no delivery stations.';
+
+  @override
+  String get phone => 'Phone';
+
+  @override
+  String get unnamedStation => 'Unnamed Station';
+
+  @override
+  String stationNumber(int number) => 'Station $number';
+
   // ==================== TASKS ====================
   @override
   String get tasks => 'Tasks';
@@ -229,7 +282,8 @@ class AppLocalizationsEn extends AppLocalizations {
   String get confirmationRequired => 'Confirmation Required';
 
   @override
-  String get confirmationDescription => 'Click the button to complete the task.';
+  String get confirmationDescription =>
+      'Click the button to complete the task.';
 
   @override
   String get checklist => 'Checklist';
@@ -241,7 +295,8 @@ class AppLocalizationsEn extends AppLocalizations {
   String get completeTask => 'Complete Task';
 
   @override
-  String get completeTaskConfirm => 'Do you want to mark this task as completed?';
+  String get completeTaskConfirm =>
+      'Do you want to mark this task as completed?';
 
   @override
   String get completeTaskNote => 'Note (optional)';
@@ -280,7 +335,8 @@ class AppLocalizationsEn extends AppLocalizations {
   String get signatureError => 'Error saving signature';
 
   @override
-  String get signatureInstruction => 'Please sign in the field below (mouse or finger).';
+  String get signatureInstruction =>
+      'Please sign in the field below (mouse or finger).';
 
   @override
   String get photoCapture => 'Take Photos';
@@ -371,7 +427,8 @@ class AppLocalizationsEn extends AppLocalizations {
   String get cameraNotAvailable => 'Camera not available';
 
   @override
-  String get cameraNotSupportedMessage => 'The camera is not supported on this platform.';
+  String get cameraNotSupportedMessage =>
+      'The camera is not supported on this platform.';
 
   @override
   String get cameraNotSupportedOnPlatform => 'Not supported on this platform';
@@ -395,7 +452,8 @@ class AppLocalizationsEn extends AppLocalizations {
   String get addPhotos => 'Add photos';
 
   @override
-  String get addPhotosInstruction => 'Use the "Select photo" button to add images from your camera or hard drive.';
+  String get addPhotosInstruction =>
+      'Use the "Select photo" button to add images from your camera or hard drive.';
 
   @override
   String get photoOf => 'of';
@@ -443,6 +501,15 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get messages => 'Messages';
 
+  @override
+  String get generalMessages => 'General Messages';
+
+  @override
+  String get noMessagesYet => 'No messages yet';
+
+  @override
+  String get noChatsAvailable => 'No chats available';
+
   @override
   String get selectPhoto => 'Select Photo';
 
@@ -528,6 +595,9 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get statusCreated => 'Created';
 
+  @override
+  String get statusPending => 'Pending';
+
   @override
   String get statusAssigned => 'Assigned';
 
@@ -537,6 +607,12 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get statusCompleted => 'Completed';
 
+  @override
+  String get statusCancelled => 'Cancelled';
+
+  @override
+  String get statusFailed => 'Failed';
+
   @override
   String get priorityLow => 'Low';