fix(pwa): tighten install support detection

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

@@ -19,7 +19,7 @@ import {
   canShowPwaInstallPromptOnce,
   recordPwaInstallPromptShown,
 } from "@/lib/chat/pwa_install_prompt";
-import { BrowserDetector, pwaUtil } from "@/utils";
+import { pwaUtil } from "@/utils";
 
 import { PwaInstallDialog } from "./pwa-install-dialog";
 import styles from "./pwa-install-overlay.module.css";
@@ -37,29 +37,39 @@ export function PwaInstallOverlay({ enabled }: PwaInstallOverlayProps) {
 
     let mounted = true;
     let timer: number | undefined;
+    let unsubscribe: (() => void) | undefined;
 
     const init = async () => {
       // const isDev = AppEnvUtil.isDevelopment();
       const isDev = false;
-      const shouldShowDialog = await shouldShowPwaInstallDialog(isDev);
-      if (!shouldShowDialog) 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();
 
-      // 达到聊天数量阈值后稍作停顿，避免弹窗与消息刷新挤在同一瞬间。
-      const delay = isDev
-        ? DEVELOPMENT_DIALOG_DELAY_MS
-        : PRODUCTION_DIALOG_DELAY_MS;
-      timer = window.setTimeout(() => {
-        if (!mounted) return;
-        showPwaDialog();
-      }, delay);
+      const tryScheduleDialog = async () => {
+        const shouldShowDialog = await shouldShowPwaInstallDialog(isDev);
+        if (!mounted || !shouldShowDialog || timer !== undefined) return;
+
+        // 达到聊天数量阈值后稍作停顿，避免弹窗与消息刷新挤在同一瞬间。
+        const delay = isDev
+          ? DEVELOPMENT_DIALOG_DELAY_MS
+          : PRODUCTION_DIALOG_DELAY_MS;
+        timer = window.setTimeout(() => {
+          if (!mounted) return;
+          showPwaDialog();
+        }, delay);
+      };
+
+      await tryScheduleDialog();
+      unsubscribe = pwaUtil.subscribe(() => {
+        void tryScheduleDialog();
+      });
     };
 
     void init();
     return () => {
       mounted = false;
+      unsubscribe?.();
       if (timer !== undefined) window.clearTimeout(timer);
     };
   }, [enabled]);
@@ -69,9 +79,7 @@ export function PwaInstallOverlay({ enabled }: PwaInstallOverlayProps) {
 
 async function shouldShowPwaInstallDialog(isDevelopment: boolean) {
   // PWA 支持 / 安装 双重门禁（两种环境都检查）。
-  if (!pwaUtil.isSupported()) return false;
-  if (pwaUtil.isInstalled()) return false;
-  if (BrowserDetector.isInAppBrowser()) return false;
+  if (!pwaUtil.canShowInstallEntry()) return false;
 
   // 开发环境：跳过"只弹一次"门禁，每次进入都弹，方便 UI 测试。
   if (isDevelopment) return true;