feat(settings): sound & vibration toggle; themed settings screen

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/ui/screens/settings_screen.dart

@@ -2,8 +2,10 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
+import '../../game/models/season.dart';
 import '../../l10n/gen/app_localizations.dart';
 import '../../state/providers.dart';
+import '../widgets/season_background.dart';
 
 class SettingsScreen extends ConsumerWidget {
   const SettingsScreen({super.key});
@@ -12,6 +14,7 @@ class SettingsScreen extends ConsumerWidget {
   Widget build(BuildContext context, WidgetRef ref) {
     final l10n = AppLocalizations.of(context)!;
     final adsRemoved = ref.watch(adsRemovedProvider);
+    final soundOn = ref.watch(soundEnabledProvider);
     final iap = ref.read(iapServiceProvider);
 
     ref.listen<bool>(adsRemovedProvider, (prev, next) {
@@ -22,37 +25,54 @@ class SettingsScreen extends ConsumerWidget {
       }
     });
 
-    return Scaffold(
-      appBar: AppBar(title: Text(l10n.settings)),
-      body: ListView(
-        padding: const EdgeInsets.all(16),
-        children: [
-          ListTile(
-            title: Text(l10n.removeAds),
-            subtitle: Text(l10n.removeAdsDescription),
-            trailing: adsRemoved
-                ? const Icon(Icons.check_circle, color: Colors.green)
-                : Text(iap.product?.price ?? ''),
-            onTap: adsRemoved
-                ? null
-                : () async {
-                    if (!iap.available || iap.product == null) {
-                      ScaffoldMessenger.of(context).showSnackBar(
-                        SnackBar(content: Text(l10n.purchaseUnavailable)),
-                      );
-                      return;
-                    }
-                    await iap.buyRemoveAds();
-                  },
+    return Stack(
+      fit: StackFit.expand,
+      children: [
+        const SeasonBackground(theme: SeasonTheme.fallback),
+        Scaffold(
+          backgroundColor: Colors.transparent,
+          appBar: AppBar(
+            backgroundColor: Colors.transparent,
+            title: Text(l10n.settings),
           ),
-          const Divider(),
-          ListTile(
-            leading: const Icon(Icons.restore),
-            title: Text(l10n.restorePurchases),
-            onTap: () => iap.restorePurchases(),
+          body: ListView(
+            padding: const EdgeInsets.all(16),
+            children: [
+              SwitchListTile(
+                title: Text(l10n.soundAndVibration),
+                value: soundOn,
+                onChanged: (v) =>
+                    ref.read(soundEnabledProvider.notifier).set(v),
+              ),
+              const Divider(),
+              ListTile(
+                title: Text(l10n.removeAds),
+                subtitle: Text(l10n.removeAdsDescription),
+                trailing: adsRemoved
+                    ? const Icon(Icons.check_circle, color: Colors.green)
+                    : Text(iap.product?.price ?? ''),
+                onTap: adsRemoved
+                    ? null
+                    : () async {
+                        if (!iap.available || iap.product == null) {
+                          ScaffoldMessenger.of(context).showSnackBar(
+                            SnackBar(content: Text(l10n.purchaseUnavailable)),
+                          );
+                          return;
+                        }
+                        await iap.buyRemoveAds();
+                      },
+              ),
+              const Divider(),
+              ListTile(
+                leading: const Icon(Icons.restore),
+                title: Text(l10n.restorePurchases),
+                onTap: () => iap.restorePurchases(),
+              ),
+            ],
           ),
-        ],
-      ),
+        ),
+      ],
     );
   }
 }