Add namoh dictionary cover to /namoh-recommendation

Author: wildjcrt

app/views/pages/info.html.erb

@@ -65,7 +65,7 @@
             <svg class="w-5 h-5 mr-2 flex-shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
               <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7"></path>
             </svg>
-            <span class="group-hover:underline">吳明義阿美族語辭典 - 推薦序</span>
+            <span class="group-hover:underline">吳明義阿美族語辭典 - 封面與推薦序</span>
           </a>
         </li>
 

app/views/pages/namoh-recommendation.html.erb

@@ -1,6 +1,11 @@
 <div id="main-content" class="mt-[75px] p-4 sm:mt-0 sm:w-3/4 bg-gray-50 mx-auto">
   <div class="bg-white rounded-lg shadow-md p-6 sm:p-8">
-    <h1 class="text-3xl font-bold text-gray-800 mb-6">吳明義阿美族語辭典 - 推薦序</h1>
+    <h1 class="text-3xl font-bold text-gray-800 mb-6">吳明義阿美族語辭典 - 封面與推薦序</h1>
+
+    <!-- 辭典封面 -->
+    <div class="mb-6">
+      <%= image_tag "/images/namoh-dictionary-cover.png", alt: "吳明義阿美族語辭典封面", class: "w-full max-w-lg mx-auto rounded-lg shadow-lg" %>
+    </div>
 
     <!-- 文件資訊說明 -->
     <div class="mb-6 p-4 bg-blue-50 border-l-4 border-blue-500 rounded">