fix: 修复上传按钮点击事件冒泡导致面板关闭问题

www/app.js

@@ -231,7 +231,8 @@ function openConversation(id) {
   const fileInput = document.getElementById('fileInput');
   
   if (attachBtn) {
-    attachBtn.addEventListener('click', () => {
+    attachBtn.addEventListener('click', (e) => {
+      e.stopPropagation();  // 阻止冒泡到 document
       attachPanel.classList.toggle('show');
     });
   }
@@ -239,7 +240,7 @@ function openConversation(id) {
   // 点击其他地方关闭面板
   document.addEventListener('click', (e) => {
     if (attachPanel && attachPanel.classList.contains('show') && 
-        !attachPanel.contains(e.target) && e.target !== attachBtn) {
+        !attachPanel.contains(e.target) && !attachBtn.contains(e.target)) {
       attachPanel.classList.remove('show');
     }
   });