🎨 Use feature based folder structure

lib/auth/captcha.native.dart

@@ -0,0 +1,43 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_inappwebview/flutter_inappwebview.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:island/auth/captcha.config.dart';
+import 'package:island/core/widgets/content/sheet.dart';
+
+class CaptchaScreen extends ConsumerWidget {
+  static Future<String?> show(BuildContext context) {
+    return Navigator.push<String>(
+      context,
+      MaterialPageRoute(
+        builder: (context) => const CaptchaScreen(),
+        fullscreenDialog: true,
+      ),
+    );
+  }
+
+  const CaptchaScreen({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final captchaUrl = ref.watch(captchaUrlProvider);
+
+    if (!captchaUrl.hasValue) return Center(child: CircularProgressIndicator());
+
+    return SheetScaffold(
+      titleText: "Anti-Robot",
+      child: InAppWebView(
+        initialUrlRequest: URLRequest(
+          url: WebUri('${captchaUrl.value}?redirect_uri=solian://captcha'),
+        ),
+        shouldOverrideUrlLoading: (controller, navigationAction) async {
+          Uri? url = navigationAction.request.url;
+          if (url != null && url.queryParameters.containsKey('captcha_tk')) {
+            Navigator.pop(context, url.queryParameters['captcha_tk']!);
+            return NavigationActionPolicy.CANCEL;
+          }
+          return NavigationActionPolicy.ALLOW;
+        },
+      ),
+    );
+  }
+}