fix: 修复媒体预览和反馈页面的交互问题

- 将click事件替换为tap事件以提升移动端体验
- 修复图片预览初始化索引不正确的问题
- 优化缩略图显示和删除按钮样式
- 移除多余的thumbnail回退逻辑

@@ -30,7 +30,7 @@ export function useMediaPreview() {
         if (item.media_type === 'IMAGE') {
             // 图片预览
             const imageItems = mediaList.filter(media => media.media_type === 'IMAGE');
-            previewImages.value = imageItems.map(img => ({ 
+            previewImages.value = imageItems.map(img => ({
                 src: img.media_url,
                 id: img.id,
                 thumbnail: img.thumbnail,

@@ -84,7 +84,7 @@
     >
       <!-- 关闭按钮 -->
       <view
-        @click.stop="closeVideo"
+        @tap.stop="closeVideo"
         class="absolute top-4 right-4 w-10 h-10 bg-black bg-opacity-50 rounded-full flex items-center justify-center"
         style="z-index: 10000;"
       >
@@ -104,7 +104,7 @@
         :object-fit="'contain'"
         :show-fullscreen-btn="true"
         style="width: 100vw; height: 50vh; position: absolute; top: 20vh; left: 0;"
-        @click.stop
+        @tap.stop
         @play="handleVideoPlay"
         @pause="handleVideoPause"
         @error="handleVideoError"
@@ -172,7 +172,7 @@ const fetchAlbumList = async () => {
         id: item.id,
         type: item.media_type === 'IMAGE' ? 'image' : 'video',
         url: item.media_url,
-        thumbnail: item.thumbnail || item.media_url, // 使用thumbnail字段，如果没有则使用media_url
+        thumbnail: item.thumbnail,
         is_my: item.is_my,
         media_type: item.media_type,
         media_url: item.media_url

@@ -28,14 +28,14 @@
             <image
               :src="item.url"
               class="w-24 h-24 rounded-lg object-cover"
-              mode="widthFix"
+              mode="aspectFill"
               @tap="() => previewImage(index)"
             />
             <view
               @click="() => deleteImage(index)"
-              class="absolute -top-2 -right-2 w-4 h-4 bg-red-500 rounded-full flex items-center justify-center"
+              class="absolute -top-1 -right-1 w-4 h-4 bg-red-500 rounded-full flex items-center justify-center"
             >
-              <view class="text-white text-xs">×</view>
+              <view class="text-white" style="font-size: 24rpx; line-height: 24rpx">×</view>
             </view>
           </view>
           <!-- 上传按钮 -->
@@ -100,7 +100,7 @@
     <nut-image-preview
       v-model:show="previewVisible"
       :images="previewImages"
-      :init-no="0"
+      :init-no="currentPreviewIndex"
       @close="closePreview"
     />
   </view>
@@ -119,6 +119,7 @@ const name = ref('');
 const contact = ref('');
 const previewVisible = ref(false);
 const previewImages = ref([]);
+const currentPreviewIndex = ref(0);
 const maxImages = 3;
 
 /**
@@ -220,6 +221,7 @@ const uploadImage = (filePath) => {
  */
 const previewImage = (index) => {
   previewImages.value = screenshots.value.map(item => ({ src: item.url }));
+  currentPreviewIndex.value = index;
   previewVisible.value = true;
 };