implemented comprehensive accessibility (A11y) support across the app

lib/view/pages/settings/widgets/push_status_sheet.dart

@@ -277,13 +277,22 @@ class _PushStatusBodyState extends State<_PushStatusBody>
   Widget _stateIcon(PushCheck state, ThemeData theme) {
     switch (state) {
       case PushCheck.ok:
-        return const Icon(Icons.check_circle_outline, color: Colors.green);
+        return const Icon(
+          Icons.check_circle_outline,
+          color: Colors.green,
+          semanticLabel: 'In Ordnung',
+        );
       case PushCheck.fail:
-        return Icon(Icons.cancel_outlined, color: theme.colorScheme.error);
+        return Icon(
+          Icons.cancel_outlined,
+          color: theme.colorScheme.error,
+          semanticLabel: 'Fehler',
+        );
       case PushCheck.unknown:
         return Icon(
           Icons.remove_circle_outline,
           color: theme.colorScheme.onSurfaceVariant,
+          semanticLabel: 'Unbekannt',
         );
     }
   }