v2.40 — Issue #9: Progress-Notification für Download/Upload (flutter_local_notifications)

- flutter_local_notifications ^22.2.0 hinzugefügt
- Notification-Channel 'de.baka.melo.downloads' in main() initialisiert
- DownloadService._showProgress(): Fortschritts-Notification mit ProgressBar
- DownloadService._completeNotification(): Abschluss-Notification (Erfolg/Fehler/Abbruch)
- Integration in downloadBatch(): Fortschritt pro Song, Abschluss nach Batch
- CloudScreen._upload(): Upload-Fortschritt + Abschluss-Notification

lib/screens/cloud_screen.dart

@@ -3,11 +3,13 @@ import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
 import '../utils/farb_theme.dart';
 import '../services/cloud_service.dart';
 import '../services/auth_service.dart';
 import '../database/db_helper.dart';
 import '../services/melo_logger.dart';
+import '../main.dart'; // notificationsPlugin
 
 /// Melo Cloud Sync Screen v3 — vollständiges Sync-System
 /// Playlisten, Favoriten, Auto-Sync, Persistent Login, Benutzerdefinierte Namen
@@ -398,6 +400,9 @@ class _CloudScreenState extends State<CloudScreen> {
 
   // ─── Upload / Download ───
 
+  static const String _cloudChannelId = 'de.baka.melo.downloads';
+  static const int _cloudNotifyId = 200;
+
   Future<void> _upload() async {
     setState(() => _ladt = true);
     _setzeStatus('Suche lokale Songs...');
@@ -413,12 +418,59 @@ class _CloudScreenState extends State<CloudScreen> {
       }
       final files = dir.listSync().whereType<File>().where(
           (f) => f.path.endsWith('.mp3') || f.path.endsWith('.m4a'));
+      final fileList = files.toList();
       int count = 0;
-      for (final f in files) {
+      for (int i = 0; i < fileList.length; i++) {
+        final f = fileList[i];
         _setzeStatus('Upload: ${f.path.split('/').last}...');
+        // Progress-Notification
+        if (Platform.isAndroid) {
+          notificationsPlugin.show(
+            id: _cloudNotifyId,
+            title: 'Melo Cloud Upload',
+            body: '${i + 1} / ${fileList.length}: ${f.path.split('/').last}',
+            notificationDetails: NotificationDetails(
+              android: AndroidNotificationDetails(
+                _cloudChannelId,
+                'Melo Downloads',
+                channelDescription: 'Cloud Upload-Fortschritt',
+                importance: Importance.low,
+                priority: Priority.low,
+                onlyAlertOnce: true,
+                showProgress: true,
+                maxProgress: fileList.length,
+                progress: i,
+                ongoing: true,
+                autoCancel: false,
+              ),
+            ),
+          );
+        }
         final sid = await widget.cloud.upload(f.path, f.path.split('/').last);
         if (sid != null) count++;
       }
+      // Abschluss-Notification
+      if (Platform.isAndroid) {
+        notificationsPlugin.cancel(id: _cloudNotifyId);
+        final ok = count > 0;
+        notificationsPlugin.show(
+          id: _cloudNotifyId + 1,
+          title: ok ? 'Cloud Upload fertig' : 'Cloud Upload fehlgeschlagen',
+          body: ok
+              ? '$count / ${fileList.length} Songs hochgeladen ✅'
+              : 'Kein Song konnte hochgeladen werden ❌',
+          notificationDetails: NotificationDetails(
+            android: AndroidNotificationDetails(
+              _cloudChannelId,
+              'Melo Downloads',
+              channelDescription: 'Cloud Upload-Abschluss',
+              importance: Importance.defaultImportance,
+              priority: Priority.defaultPriority,
+              autoCancel: true,
+            ),
+          ),
+        );
+      }
       await _ladeStatus();
       if (mounted) {
         setState(() => _ladt = false);
@@ -427,6 +479,9 @@ class _CloudScreenState extends State<CloudScreen> {
       }
     } catch (e) {
       MeloLogger().fehler('cloud_upload_path', e);
+      if (Platform.isAndroid) {
+        notificationsPlugin.cancel(id: _cloudNotifyId);
+      }
       if (mounted) {
         setState(() {
           _ladt = false;