v2.31 — Login, Einstellungen & Cloud Sync Redesign

- Login-Screen im Melo-Design (Schwarz+Rot) mit Baka-Auth JWT
- AuthService fuer Token-Management ueber baka-net.de/auth
- Registrierungs-Modus + 'Ohne Login fortfahren'
- Navidrome-Credentials optional im Login aufklappbar

- SettingsScreen ersetzt AlertDialog
- BottomNav navigiert statt Dialog zu triggern
- Cloud Sync, Server verbinden, Diagnosedaten, App-Info, Abmelden

- CloudEinstellungen-Dialog entfernt, alles in CloudScreen konsolidiert
- Hardcode login('Baka','') entfernt → AuthService.benutzer
- Gradient-Statuskarte, animierte Segment-Intervall-Auswahl
- JWT Authorization statt Klartext-Passwort

- AppConfig: API-Key defaultValue entfernt (kein Fallback-Leak)
- Build crasht ohne --dart-define MELO_API_KEY

Build: split APK (arm64 19.6M, armeabi 17.1M, x86_64 21.1M)

lib/widgets/song_tile.dart

@@ -12,7 +12,6 @@ class SongTile extends StatelessWidget {
   final ValueChanged<Song> onPlay;
   final VoidCallback onMetadataChanged;
   final ValueChanged<Song>? onAddToPlaylist;
-  final ValueChanged<Song>? onDelete;
 
   const SongTile({
     super.key,
@@ -22,7 +21,6 @@ class SongTile extends StatelessWidget {
     required this.onPlay,
     required this.onMetadataChanged,
     this.onAddToPlaylist,
-    this.onDelete,
   });
 
   @override
@@ -64,19 +62,14 @@ class SongTile extends StatelessWidget {
           ),
           InkWell(
             borderRadius: BorderRadius.circular(50),
-            onTap: () {
-              // Guard gegen null-ID (defensive)
-              final id = song.id;
-              if (id == null) return;
-              showDialog(
-                context: context,
-                builder: (_) => TagAuswahlDialog(
-                  songId: id,
-                  songTitel: song.titel,
-                  onChanged: onMetadataChanged,
-                ),
-              );
-            },
+            onTap: () => showDialog(
+              context: context,
+              builder: (_) => TagAuswahlDialog(
+                songId: song.id!,
+                songTitel: song.titel,
+                onChanged: onMetadataChanged,
+              ),
+            ),
             child: Padding(
               padding: const EdgeInsets.all(6),
               child: const Icon(Icons.label_outline, size: 14, color: MeloTheme.textSekundaer),
@@ -106,39 +99,6 @@ class SongTile extends StatelessWidget {
         ],
       ),
       onTap: hatDatei ? () => onPlay(song) : null,
-      onLongPress: onDelete != null ? () {
-        showModalBottomSheet(
-          context: context,
-          backgroundColor: MeloTheme.dunkel1,
-          builder: (ctx) => SafeArea(
-            child: Column(
-              mainAxisSize: MainAxisSize.min,
-              children: [
-                ListTile(
-                  leading: const Icon(Icons.edit, color: Colors.white),
-                  title: const Text('Bearbeiten', style: TextStyle(color: Colors.white)),
-                  onTap: () async {
-                    Navigator.pop(ctx);
-                    final geaendert = await showDialog<bool>(
-                      context: context,
-                      builder: (_) => MetadatenDialog(song: song),
-                    );
-                    if (geaendert == true) onMetadataChanged();
-                  },
-                ),
-                ListTile(
-                  leading: const Icon(Icons.delete, color: Colors.red),
-                  title: const Text('Löschen', style: TextStyle(color: Colors.red)),
-                  onTap: () {
-                    Navigator.pop(ctx);
-                    onDelete!(song);
-                  },
-                ),
-              ],
-            ),
-          ),
-        );
-      } : null,
     );
   }
 }