✨ 前端添加HTML实体解码兜底

- 添加decodeHtmlEntities方法解码文件名
- 添加getFileDisplayName统一获取显示名称
- 确保文件名正确显示，即使后端未解码

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/app.html

@@ -1373,7 +1373,7 @@
                 <i v-else-if="file.name.match(/\.(zip|rar|7z|tar|gz)$/i)" class="fas fa-file-archive" style="font-size: 64px; color: #795548;"></i>
                 <i v-else class="fas fa-file" style="font-size: 64px; color: #9E9E9E;"></i>
               </div>
-            <div class="file-name" :title="file.displayName || file.name">{{ file.displayName || file.name }}</div>
+            <div class="file-name" :title="getFileDisplayName(file)">{{ getFileDisplayName(file) }}</div>
             <div class="file-size">{{ file.isDirectory ? '文件夹' : file.sizeFormatted }}</div>
           </div>
         </div>
@@ -1419,9 +1419,9 @@
                     <i v-else-if="file.name.match(/\.(xls|xlsx)$/i)" class="fas fa-file-excel" style="font-size: 20px; color: #4CAF50; flex-shrink: 0;"></i>
                     <i v-else-if="file.name.match(/\.(zip|rar|7z|tar|gz)$/i)" class="fas fa-file-archive" style="font-size: 20px; color: #795548; flex-shrink: 0;"></i>
                     <i v-else class="fas fa-file" style="font-size: 20px; color: #9E9E9E; flex-shrink: 0;"></i>
-                    <span style="overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; min-width: 0;" :title="file.displayName || file.name">{{ file.displayName || file.name }}</span>
-                    </div>
-                  </td>
+                <span style="overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; min-width: 0;" :title="getFileDisplayName(file)">{{ getFileDisplayName(file) }}</span>
+                </div>
+              </td>
                   <td style="padding: 10px; color: var(--text-secondary);">{{ file.isDirectory ? '-' : file.sizeFormatted }}</td>
                   <td style="padding: 10px; color: var(--text-secondary);">{{ formatDate(file.modifiedTime) }}</td>
                 </tr>