修复：网页端卡片模板上传图片（design2 使用 blob URL，与 design1 一致）

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/design2/ui.js

@@ -155,7 +155,9 @@ $('body').keydown(function (event) {
 $('#addPic').click(function () {
     OpenDialog()
     function OpenDialog() {
-        dialog
+        var dialogApi = (typeof dialog !== 'undefined' && dialog) ? dialog : (window.platformBridge && window.platformBridge.showOpenDialog ? { showOpenDialog: function (opts) { return window.platformBridge.showOpenDialog(opts); } } : null);
+        if (!dialogApi) return;
+        dialogApi
             .showOpenDialog({
                 title: language_str('selectPic'), //请选择图片
                 buttonLabel: language_str('comf'), //"确认"
@@ -163,8 +165,9 @@ $('#addPic').click(function () {
             })
             .then((result) => {
                 if (result.canceled) return
-                //console.log(result.filePaths)
+                var url = (result.files && result.files[0]) ? URL.createObjectURL(result.files[0]) : (result.filePaths && result.filePaths[0]);
-                fabric.Image.fromURL(result.filePaths[0], function (image) {
+                if (!url) return
+                fabric.Image.fromURL(url, function (image) {
                     //image.left = pointer.x;
                     image.setSrc(image.toDataURL(), function (image) {
                         pre_add_image = image