fix: prevent settings editor white screens

lib/providers/extension_provider.dart

@@ -1645,10 +1645,11 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
   }
 
   List<String> getAllDownloadProviders() {
-    return state.extensions
-        .where((ext) => ext.enabled && ext.hasDownloadProvider)
-        .map((ext) => ext.id)
-        .toList(growable: false);
+    return _distinctProviderIds(
+      state.extensions
+          .where((ext) => ext.enabled && ext.hasDownloadProvider)
+          .map((ext) => ext.id),
+    );
   }
 
   List<String> getAllMetadataProviders() {
@@ -1662,10 +1663,22 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
         .where((ext) => ext.searchBehavior?.primary != true)
         .map((ext) => ext.id);
 
-    return [
+    return _distinctProviderIds([
       ...primarySearchMetadataExtensions,
       ...otherMetadataExtensions,
-    ];
+    ]);
+  }
+
+  List<String> _distinctProviderIds(Iterable<String> ids) {
+    final seen = <String>{};
+    final result = <String>[];
+    for (final id in ids) {
+      final normalized = id.trim();
+      if (normalized.isNotEmpty && seen.add(normalized)) {
+        result.add(normalized);
+      }
+    }
+    return result;
   }
 
   List<String> _replaceRetiredBuiltInMetadataProviders(List<String> input) {

lib/screens/settings/files_settings_page.dart

@@ -755,8 +755,8 @@ class _FilesSettingsPageState extends ConsumerState<FilesSettingsPage> {
 
     showModalBottomSheet<void>(
       context: context,
-      useRootNavigator: true,
       isScrollControlled: true,
+      useSafeArea: true,
       backgroundColor: colorScheme.surface,
       shape: const RoundedRectangleBorder(
         borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
@@ -794,7 +794,15 @@ class _FilesSettingsPageState extends ConsumerState<FilesSettingsPage> {
                     const SizedBox(height: 8),
                     Text(
                       description ??
-                          context.l10n.downloadFilenameDescription as String,
+                          context.l10n.downloadFilenameDescription(
+                            '{album}',
+                            '{artist}',
+                            '{date}',
+                            '{disc}',
+                            '{title}',
+                            '{track}',
+                            '{year}',
+                          ),
                       style: Theme.of(context).textTheme.bodyMedium?.copyWith(
                         color: colorScheme.onSurfaceVariant,
                       ),
@@ -924,7 +932,7 @@ class _FilesSettingsPageState extends ConsumerState<FilesSettingsPage> {
           ),
         ),
       ),
-    );
+    ).whenComplete(controller.dispose);
   }
 
   void _showAlbumFolderStructurePicker(

lib/screens/settings/metadata_provider_priority_page.dart

@@ -114,14 +114,13 @@ class _MetadataProviderPriorityPageState
     await ref
         .read(extensionProvider.notifier)
         .setMetadataProviderPriority(_providers);
+    if (!mounted) return;
     setState(() {
       _hasChanges = false;
     });
-    if (mounted) {
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(context.l10n.snackbarMetadataProviderSaved)),
-      );
-    }
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(content: Text(context.l10n.snackbarMetadataProviderSaved)),
+    );
   }
 }
 
@@ -188,10 +187,7 @@ class _MetadataProviderItem extends StatelessWidget {
                   ),
                 ),
                 const SizedBox(width: 16),
-                Icon(
-                  info.icon,
-                  color: colorScheme.secondary,
-                ),
+                Icon(info.icon, color: colorScheme.secondary),
                 const SizedBox(width: 12),
                 Expanded(
                   child: Column(

lib/screens/settings/provider_priority_page.dart

@@ -220,14 +220,13 @@ class _ProviderPriorityPageState extends ConsumerState<ProviderPriorityPage> {
 
   Future<void> _saveChanges() async {
     await ref.read(extensionProvider.notifier).setProviderPriority(_providers);
+    if (!mounted) return;
     setState(() {
       _hasChanges = false;
     });
-    if (mounted) {
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(context.l10n.snackbarProviderPrioritySaved)),
-      );
-    }
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(content: Text(context.l10n.snackbarProviderPrioritySaved)),
+    );
   }
 }
 
@@ -294,10 +293,7 @@ class _ProviderItem extends StatelessWidget {
                   ),
                 ),
                 const SizedBox(width: 16),
-                Icon(
-                  info.icon,
-                  color: colorScheme.secondary,
-                ),
+                Icon(info.icon, color: colorScheme.secondary),
                 const SizedBox(width: 12),
                 Expanded(
                   child: Column(
@@ -339,8 +335,5 @@ class _ProviderInfo {
   final String name;
   final IconData icon;
 
-  _ProviderInfo({
-    required this.name,
-    required this.icon,
-  });
+  _ProviderInfo({required this.name, required this.icon});
 }