v2.55 — Echtzeit-Cloud-Sync (SSE) mit 3 Modi: Echtzeit/Manuell/Zeit

lib/screens/home_screen.dart

@@ -21,6 +21,7 @@ import '../services/cloud_service.dart';
 import '../services/player_service.dart';
 import '../services/auth_service.dart';
 import '../services/sync_service.dart';
+import '../services/realtime_sync_service.dart';
 import '../config/app_config.dart';
 
 class MeloHome extends StatefulWidget {
@@ -30,7 +31,8 @@ class MeloHome extends StatefulWidget {
   State<MeloHome> createState() => _MeloHomeState();
 }
 
-class _MeloHomeState extends State<MeloHome> {
+class _MeloHomeState extends State<MeloHome> with WidgetsBindingObserver {
+  final RealtimeSyncService _realtimeSync = RealtimeSyncService();
   final MeloHomeViewModel _vm = MeloHomeViewModel();
   final CloudService _cloud = CloudService();
 
@@ -48,6 +50,7 @@ class _MeloHomeState extends State<MeloHome> {
   @override
   void initState() {
     super.initState();
+    WidgetsBinding.instance.addObserver(this);
     _vm.ladeSongs();
     // Gespeicherte Navidrome-Zugangsdaten laden → Musikserver-Statuspunkt
     _vm.navidrome.ladeGespeicherteZugangsdaten().then((_) {
@@ -55,17 +58,37 @@ class _MeloHomeState extends State<MeloHome> {
     });
     // Cloud-Verbindung beim App-Start herstellen (feuern-und-vergessen).
     _cloud.verbinde();
+    // Realtime-Sync starten (SSE-Push, wenn Modus=Echtzeit)
+    _realtimeSync.starteWennAktiviert();
     // Tipp auf die Sync-Abschluss-/Fehler-Notification → Cloud-Tab öffnen
     SyncService.syncBenachrichtigungGetippt.addListener(_syncNotifGetippt);
   }
 
   @override
   void dispose() {
+    WidgetsBinding.instance.removeObserver(this);
     SyncService.syncBenachrichtigungGetippt.removeListener(_syncNotifGetippt);
+    _realtimeSync.stoppe();
     _vm.dispose();
     super.dispose();
   }
 
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    super.didChangeAppLifecycleState(state);
+    switch (state) {
+      case AppLifecycleState.resumed:
+        // App in den Vordergrund → Realtime fortsetzen
+        _realtimeSync.fortsetzen();
+      case AppLifecycleState.paused:
+      case AppLifecycleState.detached:
+      case AppLifecycleState.inactive:
+      case AppLifecycleState.hidden:
+        // App im Hintergrund → Realtime pausieren (Batterie sparen)
+        _realtimeSync.pausiere();
+    }
+  }
+
   /// Öffnet den Cloud-Tab, wenn die Sync-Notification getippt wurde.
   void _syncNotifGetippt() {
     if (!mounted) return;