Code Review Optimierungen: Typsicherheit, Scanner-Performance, DB Upgrade Template, Division Guard

lib/widgets/navidrome_browser.dart

@@ -1,11 +1,12 @@
 import 'package:flutter/material.dart';
 import '../services/navidrome_service.dart';
 import '../utils/farb_theme.dart';
+import '../viewmodels/melo_home_viewmodel.dart';
 
 /// Navidrome-Browser als Bottom-Sheet.
 /// Manuell in home_screen.dart einbaubar.
 class NavidromeBrowser extends StatefulWidget {
-  final dynamic vm;
+  final MeloHomeViewModel vm;
   const NavidromeBrowser({super.key, required this.vm});
 
   @override

lib/widgets/playlist_sheet.dart

@@ -2,10 +2,11 @@ import 'package:flutter/material.dart';
 import '../models/song.dart';
 import '../models/playlist.dart';
 import '../utils/farb_theme.dart';
+import '../viewmodels/melo_home_viewmodel.dart';
 
 /// Bottom-Sheet zum Durchstöbern von Playlists.
 class PlaylistSheet extends StatefulWidget {
-  final dynamic vm;
+  final MeloHomeViewModel vm;
   const PlaylistSheet({super.key, required this.vm});
 
   @override
@@ -174,7 +175,7 @@ class _PlaylistSheetState extends State<PlaylistSheet> {
 class _PlaylistDetail extends StatelessWidget {
   final Playlist p;
   final List<Song> songs;
-  final dynamic vm;
+  final MeloHomeViewModel vm;
   final VoidCallback onChanged;
 
   const _PlaylistDetail({