🐛 修复分享链接打开方式

- 添加openShare方法替代直接调用window.open
- 处理弹窗被浏览器阻止的情况，自动退回当前页跳转

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

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

frontend/app.js

@@ -2015,6 +2015,15 @@ handleDragLeave(e) {
       return d.toLocaleString();
     },
 
+    openShare(url) {
+      if (!url) return;
+      const newWindow = window.open(url, '_blank', 'noopener');
+      if (!newWindow || newWindow.closed || typeof newWindow.closed === 'undefined') {
+        // 部分浏览器可能阻止弹窗，退回当前页跳转
+        window.location.href = url;
+      }
+    },
+
     copyShareLink(url) {
       // 复制分享链接到剪贴板
       if (navigator.clipboard && navigator.clipboard.writeText) {