style(messages): 调整对话列表样式和布局

移除不必要的边距和固定高度，使布局更灵活
将 content-container 重命名为 content-container1 以保持命名一致性

@@ -41,7 +41,7 @@
             @scrolltolower="loadMore" @scroll="scroll" :lower-threshold="20" :enable-flex="false"
             :scroll-top="scrollTop">
             <view v-for="conversation in filteredConversations" :key="conversation.id"
-                class="conversation-item mt-2 mb-4 border-b border-gray-100 pb-2"
+                class="conversation-item border-b border-gray-100 pb-2"
                 @click="onConversationClick(conversation)">
                 <view class="flex items-start">
                     <view class="avatar-container flex-shrink-0">
@@ -53,7 +53,7 @@
                             </view>
                         </view>
                     </view>
-                    <view class="content-container flex-1 min-w-0">
+                    <view class="content-container1 flex-1 min-w-0">
                         <view class="flex justify-between items-center mb-1">
                             <text class="font-medium flex-1 mr-2 truncate">{{ conversation.name }}</text>
                             <view class="flex items-center flex-shrink-0">
@@ -109,7 +109,7 @@ import { getMessagesListAPI, getMessagesDetailAPI } from '@/api/chat'
 const defaultAvatar = 'https://cdn.ipadbiz.cn/mlaj/images/icon_1.jpeg'
 
 const scrollStyle = ref({
-    height: 'calc(100vh - 500rpx)'
+    height: 'auto'
 })
 
 // 滚动相关变量
@@ -509,9 +509,7 @@ onUnmounted(() => {
 
     /* 对话列表样式 */
     .conversation-list {
-        height: calc(100vh - 500rpx);
         background: #ffffff;
-        overflow: hidden;
         box-sizing: border-box;
     }
 
@@ -524,7 +522,6 @@ onUnmounted(() => {
         padding: 24rpx 20rpx;
         border-bottom: 1rpx solid #f0f0f0;
         transition: background-color 0.2s;
-        margin: 20rpx 0;
     }
 
     .avatar-container {
@@ -533,7 +530,7 @@ onUnmounted(() => {
         flex-shrink: 0;
     }
 
-    .content-container {
+    .content-container1 {
         flex: 1;
         min-width: 0;
         padding-left: 8rpx;