feat(DefaultSharePage): loading add mask

components/share/DefaultSharePage.vue

@@ -100,15 +100,7 @@ export default {
     },
 
     async sharePage() {
-      if (!this.qrCodeImage) {
-        uni.showToast({
-          title: '二维码尚未生成',
-          icon: 'none',
-        })
-        return
-      }
-
-      uni.showLoading({ title: '加载中...' })
+      uni.showLoading({ title: '加载中...', mask: true })
 
       try {
         this.shareButtonShow = false
@@ -116,8 +108,6 @@ export default {
 
         await this.capturePageWithHtml2Canvas()
       } catch (error) {
-        uni.hideLoading()
-        uni.showToast({ title: '图片生成失败，请稍后重试', icon: 'none' })
         console.error('sharePage error:', error)
       } finally {
         // 恢复按钮显示