fix(ad): 높이에 따라 템플릿/최소높이 자동 조정

lib/presentation/widgets/native_ad_placeholder.dart

@@ -19,7 +19,7 @@ class NativeAdPlaceholder extends StatefulWidget {
   const NativeAdPlaceholder({
     super.key,
     this.margin,
-    this.height = 360,
+    this.height = 200,
     this.refreshInterval = const Duration(minutes: 2),
     this.enabled = true,
   });
@@ -55,6 +55,14 @@ class _NativeAdPlaceholderState extends State<NativeAdPlaceholder> {
       return;
     }
 
+    final oldType = _templateTypeForHeight(oldWidget.height);
+    final newType = _templateTypeForHeight(widget.height);
+
+    if (oldType != newType) {
+      _loadAd();
+      return;
+    }
+
     if (!oldWidget.enabled && widget.enabled) {
       _loadAd();
       return;
@@ -92,10 +100,11 @@ class _NativeAdPlaceholderState extends State<NativeAdPlaceholder> {
     });
 
     final adUnitId = AdHelper.nativeAdUnitId;
+    final templateType = _templateTypeForHeight(widget.height);
     _nativeAd = NativeAd(
       adUnitId: adUnitId,
       request: const AdRequest(),
-      nativeTemplateStyle: _buildTemplateStyle(),
+      nativeTemplateStyle: _buildTemplateStyle(templateType),
       listener: NativeAdListener(
         onAdLoaded: (ad) {
           if (!mounted) {
@@ -131,10 +140,10 @@ class _NativeAdPlaceholderState extends State<NativeAdPlaceholder> {
     _refreshTimer = Timer(delay, _loadAd);
   }
 
-  NativeTemplateStyle _buildTemplateStyle() {
+  NativeTemplateStyle _buildTemplateStyle(TemplateType templateType) {
     final isDark = Theme.of(context).brightness == Brightness.dark;
     return NativeTemplateStyle(
-      templateType: TemplateType.medium,
+      templateType: templateType,
       mainBackgroundColor: isDark ? AppColors.darkSurface : Colors.white,
       cornerRadius: 0,
       callToActionTextStyle: NativeTemplateTextStyle(
@@ -218,15 +227,25 @@ class _NativeAdPlaceholderState extends State<NativeAdPlaceholder> {
   }
 
   double _resolveContainerHeight() {
-    final platformMinHeight = switch (defaultTargetPlatform) {
+    final templateType = _templateTypeForHeight(widget.height);
+    final minHeight = _templateMinHeight(templateType);
+    return max(widget.height, minHeight);
+  }
+
+  TemplateType _templateTypeForHeight(double height) {
+    // Medium 템플릿은 SDK 기본 레이아웃이 커서, 높이가 낮을 경우 Small로 대체해 잘림을 방지한다.
+    return height < 320 ? TemplateType.small : TemplateType.medium;
+  }
+
+  double _templateMinHeight(TemplateType type) {
+    if (type == TemplateType.small) {
+      return 120;
+    }
+    return switch (defaultTargetPlatform) {
       TargetPlatform.iOS => 402.0,
       TargetPlatform.android => 350.0,
       _ => 320.0,
     };
-
-    // 네이티브 템플릿(Medium) 기본 레이아웃이 플랫폼별로 350~402dp를 요구해
-    // 호출자가 지정한 높이보다 작을 경우 클리핑을 막기 위해 최소 높이를 강제한다.
-    return max(widget.height, platformMinHeight);
   }
 
   BoxDecoration _decoration(bool isDark) {