style(UI): 统一卡片样式并增强视觉效果

为所有页面卡片添加 enhanced-card 类，实现统一视觉风格
添加卡片悬停动画、顶部装饰条和状态变化效果
优化状态标签、按钮和详情布局的样式

pending_bookings.php

@@ -602,7 +602,7 @@ try {
         
 
         
-        <div class="card">
+        <div class="card enhanced-card">
             <h2>待处理预约 (共 <?php echo count($pending_submissions); ?> 条)</h2>
             
             <?php if (empty($pending_submissions)): ?>
@@ -610,7 +610,7 @@ try {
             <?php else: ?>
                 <!-- 无论记录数量多少，都显示选择列表 -->
                 <?php if (true): ?>
-                    <div class="submission-selector">
+                    <div class="submission-selector enhanced-card">
                         <h3>选择要处理的预约记录</h3>
                         <div class="submission-list">
                             <?php foreach ($pending_submissions as $submission): ?>
@@ -632,7 +632,7 @@ try {
                 
                 <!-- 显示选中的预约记录的处理表单 -->
                 <?php foreach ($pending_submissions as $submission): ?>
-                    <div class="pending-card" id="submission_<?php echo $submission['id']; ?>" style="display: none;">
+                    <div class="pending-card enhanced-card" id="submission_<?php echo $submission['id']; ?>" style="display: none;">
                         <div class="pending-header">
                             <h3><?php echo htmlspecialchars($submission['name']); ?> 的预约请求</h3>
                             <span class="status-badge status-pending">待处理</span>
@@ -711,7 +711,7 @@ try {
                                     </select>
                                 </div>
                                 
-                                <div class="package-info" id="packageInfo_<?php echo $submission['id']; ?>">
+                                <div class="package-info enhanced-card" id="packageInfo_<?php echo $submission['id']; ?>">
                                     <div class="package-details">
                                         <h4 id="packageName_<?php echo $submission['id']; ?>"></h4>
                                         <div class="package-meta">