Added functionality to jump to talk-tab when app is launched via notification

lib/api/apiError.dart

@@ -2,4 +2,9 @@ class ApiError {
   String message;
 
   ApiError(this.message);
+
+  @override
+  String toString() {
+    return "ApiError: $message";
+  }
 }

lib/app.dart

@@ -23,12 +23,13 @@ import 'view/pages/timetable/timetable.dart';
 class App extends StatefulWidget {
   const App({Key? key}) : super(key: key);
 
+  static PersistentTabController bottomNavigator = PersistentTabController(initialIndex: 0);
+
   @override
   State<App> createState() => _AppState();
 }
 
 class _AppState extends State<App> {
-  int currentPage = 0;
   late Timer refetchChats;
   late Timer updateTimings;
 
@@ -68,11 +69,9 @@ class _AppState extends State<App> {
 
   @override
   Widget build(BuildContext context) {
-    PersistentTabController tabController = PersistentTabController(initialIndex: 0);
-
     return PersistentTabView(
       context,
-      controller: tabController,
+      controller: App.bottomNavigator,
       navBarStyle: NavBarStyle.style6,
       hideNavigationBarWhenKeyboardShows: true,
       navBarHeight: MediaQuery.of(context).viewInsets.bottom > 0 ? 0.0 : kBottomNavigationBarHeight,

lib/notification/notificationController.dart

@@ -44,6 +44,7 @@ class NotificationController {
   }
 
   static Future<void> onAppOpenedByNotification(RemoteMessage message, BuildContext context) async {
+    NotificationTasks.navigateToTalk();
     NotificationTasks.updateProviders(context);
 
     DebugTile(context).run(() {

lib/notification/notificationTasks.dart

@@ -1,6 +1,7 @@
 import 'package:firebase_messaging/firebase_messaging.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter_app_badger/flutter_app_badger.dart';
+import 'package:marianum_mobile/app.dart';
 import 'package:provider/provider.dart';
 
 import '../model/chatList/chatListProps.dart';
@@ -17,6 +18,6 @@ class NotificationTasks {
   }
 
   static void navigateToTalk() {
-    // TODO Navigate
+    App.bottomNavigator.jumpToTab(1);
   }
 }