fix(english): explain DaoTekno in-app browser block instead of bare 403

plugins/english/daotekno.ts

@@ -27,7 +27,7 @@ import { defaultCover } from '@libs/defaultCover';
 class DaoTekno implements Plugin.PluginBase {
   id = 'daotekno';
   name = 'DaoTekno';
-  version = '1.0.1';
+  version = '1.0.2';
   icon = 'src/en/daotekno/icon.png';
   site = 'https://daotekno.com/';
 
@@ -56,9 +56,22 @@ class DaoTekno implements Plugin.PluginBase {
   private async fetchSite(url: string, init?: FetchInit) {
     const res = await fetchApi(url, init);
     if (!res.ok) {
-      throw Object.assign(new Error('Request failed: ' + res.status), {
-        status: res.status,
-      });
+      let message = 'Request failed: ' + res.status;
+      if (res.headers.get('cf-mitigated') === 'challenge') {
+        message =
+          'Cloudflare challenge (HTTP ' +
+          res.status +
+          '). Open daotekno.com in WebView to pass it, then retry.';
+      } else if (
+        res.status === 403 &&
+        /in-app browser is not allowed/i.test(await res.text())
+      ) {
+        message =
+          'daotekno.com blocks reading in apps and in-app browsers ' +
+          '(HTTP 403 "Access Denied") and asks readers to open the site ' +
+          'in Google Chrome instead.';
+      }
+      throw Object.assign(new Error(message), { status: res.status });
     }
     return res;
   }