🐛 Fix some issues on Android and Web

lib/screens/captcha.dart

@@ -1,23 +1,67 @@
+import 'dart:html' as html;
+import 'dart:ui_web' as ui;
 import 'package:easy_localization/easy_localization.dart';
+import 'package:flutter/foundation.dart' show kIsWeb;
 import 'package:flutter/material.dart';
 import 'package:flutter_inappwebview/flutter_inappwebview.dart';
 import 'package:provider/provider.dart';
 import 'package:surface/providers/config.dart';
 import 'package:surface/widgets/navigation/app_scaffold.dart';
 
-class TurnstileScreen extends StatefulWidget {
-  const TurnstileScreen({
+class CaptchaScreen extends StatefulWidget {
+  const CaptchaScreen({
     super.key,
   });
 
   @override
-  State<TurnstileScreen> createState() => _TurnstileScreenState();
+  State<CaptchaScreen> createState() => _CaptchaScreenState();
 }
 
-class _TurnstileScreenState extends State<TurnstileScreen> {
+class _CaptchaScreenState extends State<CaptchaScreen> {
+  @override
+  void initState() {
+    super.initState();
+    if (kIsWeb) {
+      _setupWebListener();
+    }
+  }
+
+  void _setupWebListener() {
+    html.window.onMessage.listen((event) {
+      if (event.data != null && event.data is String) {
+        final message = event.data as String;
+        if (message.startsWith("captcha_tk=")) {
+          String token = message.replaceFirst("captcha_tk=", "");
+          Navigator.pop(context, token);
+        }
+      }
+    });
+
+    // Create an iframe for the captcha page
+    final iframe = html.IFrameElement()
+      ..src = '${context.read<ConfigProvider>().serverUrl}/captcha?redirect_uri=solink://captcha'
+      ..style.border = 'none'
+      ..width = '100%'
+      ..height = '100%';
+
+    html.document.body!.append(iframe);
+    ui.platformViewRegistry.registerViewFactory(
+      'captcha-iframe',
+      (int viewId) => iframe,
+    );
+  }
+
   @override
   Widget build(BuildContext context) {
     final cfg = context.read<ConfigProvider>();
+
+    if (kIsWeb) {
+      return AppScaffold(
+        appBar: AppBar(title: Text("reCaptcha").tr()),
+        body: HtmlElementView(viewType: 'captcha-iframe'),
+      );
+    }
+
     return AppScaffold(
       appBar: AppBar(title: Text("reCaptcha").tr()),
       body: InAppWebView(