fix(ad): 네이티브 템플릿 높이 보정

lib/presentation/widgets/native_ad_placeholder.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:math';
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:google_mobile_ads/google_mobile_ads.dart';
 import 'package:lunchpick/core/constants/app_colors.dart';
@@ -18,7 +19,7 @@ class NativeAdPlaceholder extends StatefulWidget {
   const NativeAdPlaceholder({
     super.key,
     this.margin,
-    this.height = 200,
+    this.height = 360,
     this.refreshInterval = const Duration(minutes: 2),
     this.enabled = true,
   });
@@ -155,21 +156,29 @@ class _NativeAdPlaceholderState extends State<NativeAdPlaceholder> {
   @override
   Widget build(BuildContext context) {
     final isDark = Theme.of(context).brightness == Brightness.dark;
+    final containerHeight = _resolveContainerHeight();
 
     if (!AdHelper.isMobilePlatform || !widget.enabled) {
-      return _buildPlaceholder(isDark, isLoading: false);
+      return _buildPlaceholder(
+        isDark,
+        containerHeight: containerHeight,
+        isLoading: false,
+      );
     }
 
     return AnimatedSwitcher(
       duration: const Duration(milliseconds: 250),
       child: _isLoaded && _nativeAd != null
-          ? _buildAdView(isDark)
-          : _buildPlaceholder(isDark, isLoading: _isLoading),
+          ? _buildAdView(isDark, containerHeight)
+          : _buildPlaceholder(
+              isDark,
+              containerHeight: containerHeight,
+              isLoading: _isLoading,
+            ),
     );
   }
 
-  Widget _buildAdView(bool isDark) {
-    final containerHeight = max(widget.height, 200.0);
+  Widget _buildAdView(bool isDark, double containerHeight) {
     return Container(
       key: const ValueKey('nativeAdLoaded'),
       margin: widget.margin ?? EdgeInsets.zero,
@@ -180,8 +189,11 @@ class _NativeAdPlaceholderState extends State<NativeAdPlaceholder> {
     );
   }
 
-  Widget _buildPlaceholder(bool isDark, {required bool isLoading}) {
-    final containerHeight = max(widget.height, 200.0);
+  Widget _buildPlaceholder(
+    bool isDark, {
+    required double containerHeight,
+    required bool isLoading,
+  }) {
     return Container(
       key: const ValueKey('nativeAdPlaceholder'),
       margin: widget.margin ?? EdgeInsets.zero,
@@ -205,6 +217,18 @@ class _NativeAdPlaceholderState extends State<NativeAdPlaceholder> {
     );
   }
 
+  double _resolveContainerHeight() {
+    final platformMinHeight = 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) {
     return BoxDecoration(
       color: isDark ? AppColors.darkSurface : Colors.white,