wrap every view that uses a snackbar in ScaffoldMessenger

lib/presentation/views/main_menu/group_view/create_group_view.dart

@@ -44,7 +44,8 @@ class _CreateGroupViewState extends State<CreateGroupView> {
   @override
   Widget build(BuildContext context) {
     final loc = AppLocalizations.of(context);
-    return Scaffold(
+    return ScaffoldMessenger(
+      child: Scaffold(
         backgroundColor: CustomTheme.backgroundColor,
         appBar: AppBar(title: Text(loc.create_new_group)),
         body: SafeArea(
@@ -106,6 +107,7 @@ class _CreateGroupViewState extends State<CreateGroupView> {
             ],
           ),
         ),
+      ),
     );
   }
 }

lib/presentation/views/main_menu/match_view/create_match/create_match_view.dart

@@ -119,7 +119,8 @@ class _CreateMatchViewState extends State<CreateMatchView> {
   @override
   Widget build(BuildContext context) {
     final loc = AppLocalizations.of(context);
-    return Scaffold(
+    return ScaffoldMessenger(
+      child: Scaffold(
         backgroundColor: CustomTheme.backgroundColor,
         appBar: AppBar(title: Text(loc.create_new_match)),
         body: SafeArea(
@@ -255,6 +256,7 @@ class _CreateMatchViewState extends State<CreateMatchView> {
             ],
           ),
         ),
+      ),
     );
   }
 

lib/presentation/views/main_menu/settings_view.dart

@@ -21,7 +21,8 @@ class _SettingsViewState extends State<SettingsView> {
   @override
   Widget build(BuildContext context) {
     final loc = AppLocalizations.of(context);
-    return Scaffold(
+    return ScaffoldMessenger(
+      child: Scaffold(
         appBar: AppBar(backgroundColor: CustomTheme.backgroundColor),
         backgroundColor: CustomTheme.backgroundColor,
         body: LayoutBuilder(
@@ -121,6 +122,7 @@ class _SettingsViewState extends State<SettingsView> {
                 ),
               ),
         ),
+      ),
     );
   }