feat(mini): v4.0.8 客服卡片主包落地、定位误报修复，合伙人微信内预览保存海报

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

packages/weixin-sdk/src/previewImage.ts

@@ -0,0 +1,33 @@
+import { ensureJssdkReady } from './jssdk';
+import type { WeixinSdkConfig } from './types';
+
+export function isHttpImageUrl(url?: string | null): url is string {
+  return !!url && /^https?:\/\//i.test(url.trim());
+}
+
+/** 微信内预览图片，便于长按保存到相册（须是可公网访问的 http(s) 地址） */
+export async function previewWechatImage(config: WeixinSdkConfig, url: string): Promise<void> {
+  const href = url.trim();
+  if (!isHttpImageUrl(href)) {
+    throw new Error('图片地址无效');
+  }
+
+  await ensureJssdkReady({
+    apiBase: config.apiBase ?? '/api/v1',
+    clientApp: config.clientApp,
+    getAccessToken: config.getAccessToken,
+  });
+
+  if (!window.wx?.previewImage) {
+    throw new Error('微信预览图片不可用');
+  }
+
+  await new Promise<void>((resolve, reject) => {
+    window.wx!.previewImage!({
+      current: href,
+      urls: [href],
+      success: () => resolve(),
+      fail: (res) => reject(new Error(res?.errMsg || '预览失败')),
+    });
+  });
+}