统一各页面布局宽度，移除所有返回大厅按钮

- 留言板、排行榜页面全部移除 nav-left 中的返回大厅链接
- 留言板主体容器改为 max-w-7xl mx-auto，与大厅和排行榜统一

resources/views/guestbook/index.blade.php

@@ -11,15 +11,7 @@
 @section('nav-icon', '✉️')
 @section('nav-title', '星光留言板')
 
-@section('nav-left')
-    <a href="{{ route('rooms.index') }}" class="text-indigo-200 hover:text-white transition flex items-center group">
-        <svg class="w-5 h-5 mr-1 transform group-hover:-translate-x-1 transition" fill="none" stroke="currentColor"
-            viewBox="0 0 24 24">
-            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M10 19l-7-7m0 0l7-7m-7 7h18"></path>
-        </svg>
-        返回大厅
-    </a>
-@endsection
+
 
 
 
@@ -81,7 +73,7 @@
         </div>
 
         {{-- 主体内容区 --}}
-        <div class="flex w-full mt-4 px-6 gap-6">
+        <div class="flex max-w-7xl mx-auto mt-4 px-6 gap-6">
 
             {{-- 左侧：分类导航 --}}
             <div
@@ -187,8 +179,7 @@
                             <span class="text-6xl drop-shadow-sm mb-6">📭</span>
                             <h3 class="text-xl font-bold text-gray-800 tracking-wide">暂无信件</h3>
                             <p class="mt-3 text-gray-400">这里是空空如也的荒原。</p>
-                            <button
-                                @click="showWriteForm = true; towho = ''; setTimeout(() => $refs.textBody.focus(), 100)"
+                            <button @click="showWriteForm = true; towho = ''; setTimeout(() => $refs.textBody.focus(), 100)"
                                 class="mt-8 bg-indigo-50 hover:bg-indigo-100 text-indigo-600 font-bold py-2.5 px-6 rounded-xl transition-colors border border-indigo-100/50">
                                 来抢沙发留言吧！
                             </button>

resources/views/leaderboard/index.blade.php

@@ -11,15 +11,7 @@
 @section('nav-icon', '🏆')
 @section('nav-title', '风云排行榜')
 
-@section('nav-left')
-    <a href="{{ route('rooms.index') }}" class="text-indigo-200 hover:text-white transition flex items-center group">
-        <svg class="w-5 h-5 mr-1 transform group-hover:-translate-x-1 transition" fill="none" stroke="currentColor"
-            viewBox="0 0 24 24">
-            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M10 19l-7-7m0 0l7-7m-7 7h18"></path>
-        </svg>
-        返回大厅
-    </a>
-@endsection
+