fix: code-review #2 — dedup MagicBytes, auth für check_corrupted, UI-Flag, merged player streams, jq-JSON

lib/screens/cloud_screen.dart

@@ -27,6 +27,7 @@ class _CloudScreenState extends State<CloudScreen> {
   String _letzterSync = 'Nie';
   List<Map> _korrupteSongs = [];
   bool _ladtKorrupt = false;
+  bool _hatGeprueft = false;
 
   @override
   void initState() {
@@ -94,12 +95,13 @@ class _CloudScreenState extends State<CloudScreen> {
   }
 
   Future<void> _ladeKorrupteSongs() async {
-    setState(() => _ladtKorrupt = true);
+    setState(() { _ladtKorrupt = true; _hatGeprueft = false; });
     try {
       final corrupted = await widget.cloud.getCorrupted();
-      if (mounted) setState(() => _korrupteSongs = corrupted);
+      if (mounted) setState(() { _korrupteSongs = corrupted; _hatGeprueft = true; });
     } catch (e) {
       MeloLogger().fehler('cloud_corrupted_laden', e);
+      if (mounted) setState(() => _hatGeprueft = true);
     } finally {
       if (mounted) setState(() => _ladtKorrupt = false);
     }
@@ -598,7 +600,7 @@ class _CloudScreenState extends State<CloudScreen> {
                 ],
               ),
             )),
-          ] else if (!_ladtKorrupt && _korrupteSongs.isEmpty)
+          ] else if (!_ladtKorrupt && _hatGeprueft && _korrupteSongs.isEmpty)
             const Padding(
               padding: EdgeInsets.only(top: 8),
               child: Text(