fix(pwa): suppress install dialog in in-app browsers

src/app/chat/components/pwa-install-overlay.tsx

@@ -14,6 +14,7 @@
  */
 import { useEffect } from "react";
 
+import { BrowserDetector } from "@/utils/browser-detect";
 import { SpAsyncUtil } from "@/utils/storage";
 import { pwaUtil } from "@/utils/pwa";
 
@@ -32,6 +33,7 @@ export function PwaInstallOverlay() {
       //    isInstalled() 检查 standalone display-mode（避免给已安装用户再弹）
       if (!pwaUtil.isSupported()) return;
       if (pwaUtil.isInstalled()) return;
+      if (BrowserDetector.isInAppBrowser()) return;
       // 提前挂 beforeinstallprompt 监听，避免用户点 OK 时事件已在更早时机丢失。
       pwaUtil.prepareInstallPrompt();