fix: hide download URL in in-app browser guide

Stop exposing the internal /apnew/api/.../download URL in the guide. The dialog no longer renders the file URL or copies it to the clipboard; instead the user copies the current page link (window.location.href) and opens it in their system browser, then taps download again — which uses the real fetch+blob path. Updated step copy and intro in all 7 locales to match the new flow.

src/locales/zh-CN.ts

@@ -247,13 +247,15 @@ export const zhDict: Dict = {
   backToHome: "返回首页",
   inAppDownloadTitle: "请使用系统浏览器打开后下载",
   inAppDownloadIntro:
-    "当前内置浏览器无法下载文件。复制下方链接，到系统浏览器打开即可直接下载。",
+    "当前内置浏览器无法下载文件。请在系统浏览器中打开本页面，然后再次点击下载按钮。",
   inAppDownloadIntroNamed:
-    "{browser} 内置浏览器无法下载文件。复制下方链接，到系统浏览器打开即可直接下载。",
-  inAppDownloadStepCopy: "点击下方「复制链接」（这是文件的直接下载地址）。",
+    "{browser} 内置浏览器无法下载文件。请在系统浏览器中打开本页面，然后再次点击下载按钮。",
+  inAppDownloadStepCopy: "点击右上角菜单，选择「在默认浏览器中打开」。",
   inAppDownloadStepOpen:
-    "打开系统浏览器（Safari、Chrome 等），把链接粘贴到地址栏。",
-  inAppDownloadStepDownload: "文件会自动开始下载到下载文件夹。",
-  inAppDownloadCopied: "链接已复制",
+    "如果没有该选项，可点击下方「复制页面链接」，再到 Safari、Chrome 等浏览器中打开。",
+  inAppDownloadStepDownload:
+    "系统浏览器打开页面后，再次点击下载按钮即可把文件保存到下载文件夹。",
+  inAppDownloadCopyPageLink: "复制页面链接",
+  inAppDownloadCopied: "页面链接已复制",
   inAppDownloadCopyFail: "复制失败，请手动复制",
 };