fix(ad): 스크린샷 모드에서 네이티브 광고 비활성화

lib/presentation/pages/settings/settings_screen.dart

@@ -54,6 +54,10 @@ class _SettingsScreenState extends ConsumerState<SettingsScreen> {
   @override
   Widget build(BuildContext context) {
     final isDark = Theme.of(context).brightness == Brightness.dark;
+    final screenshotModeAsync = ref.watch(screenshotModeEnabledProvider);
+    final screenshotModeEnabled = screenshotModeAsync.valueOrNull ?? false;
+    final isUpdatingSettings = ref.watch(settingsNotifierProvider).isLoading;
+    final showScreenshotTools = !kReleaseMode;
 
     return Scaffold(
       backgroundColor: isDark
@@ -350,6 +354,29 @@ class _SettingsScreenState extends ConsumerState<SettingsScreen> {
                 ],
               ),
             ),
+            if (showScreenshotTools)
+              Card(
+                margin: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
+                color: isDark ? AppColors.darkSurface : AppColors.lightSurface,
+                shape: RoundedRectangleBorder(
+                  borderRadius: BorderRadius.circular(12),
+                ),
+                child: SwitchListTile.adaptive(
+                  title: const Text('스크린샷 모드'),
+                  subtitle: const Text('네이티브 광고를 숨기고 가상의 추천 결과를 표시합니다'),
+                  value: screenshotModeEnabled,
+                  onChanged:
+                      (isUpdatingSettings || screenshotModeAsync.isLoading)
+                      ? null
+                      : (value) async {
+                          await ref
+                              .read(settingsNotifierProvider.notifier)
+                              .setScreenshotModeEnabled(value);
+                          ref.invalidate(screenshotModeEnabledProvider);
+                        },
+                  activeColor: AppColors.lightPrimary,
+                ),
+              ),
             if (kDebugMode) _buildDebugToolsCard(isDark),
           ], isDark),