fix(project): 修复弹窗中表单上传组件预览图片层级问题 (#8205)

将 PreviewGroupComponent 的 hidden class 替换为通过 classes.popup.root
设置更高 z-index，避免在弹窗内被遮挡

apps/web-antdv-next/src/adapter/component/index.ts

@@ -295,7 +295,7 @@ async function previewImage(
         return h(
           PreviewGroupComponent,
           {
-            class: 'hidden',
+            classes: { popup: { root: '!z-2000' } },
             preview: {
               open: open.value,
               current: currentIndex,

playground/src/adapter/component/index.ts

@@ -295,7 +295,7 @@ async function previewImage(
         return h(
           PreviewGroupComponent,
           {
-            class: 'hidden',
+            classes: { popup: { root: '!z-2000' } },
             preview: {
               open: open.value,
               current: currentIndex,