fix(seed): block screenshots on the verify-seed screen

lib/screens/verify_seed/verify_seed_page.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_svg/svg.dart';
+import 'package:no_screenshot/no_screenshot.dart';
 import 'package:realunit_wallet/generated/i18n.dart';
 import 'package:realunit_wallet/packages/service/wallet_service.dart';
 import 'package:realunit_wallet/packages/wallet/wallet.dart';
@@ -26,9 +27,32 @@ class VerifySeedPage extends StatelessWidget {
   );
 }
 
-class VerifySeedView extends StatelessWidget {
+class VerifySeedView extends StatefulWidget {
   const VerifySeedView({super.key});
 
+  @override
+  State<VerifySeedView> createState() => _VerifySeedViewState();
+}
+
+class _VerifySeedViewState extends State<VerifySeedView> {
+  // @no-integration-test: no_screenshot suppresses the OS screenshot /
+  // app-switcher thumbnail / screen-recording via a platform channel — the
+  // real effect is only observable on a device, not in a widget/golden test.
+  @override
+  void initState() {
+    // Seed words are entered/visible here — block screenshots and the
+    // app-switcher snapshot like the other seed screens. Re-enabled on dispose
+    // so other screens stay screenshot-able.
+    NoScreenshot.instance.screenshotOff();
+    super.initState();
+  }
+
+  @override
+  void dispose() {
+    NoScreenshot.instance.screenshotOn();
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(

test/goldens/screens/verify_seed/verify_seed_golden_test.dart

@@ -1,5 +1,6 @@
 import 'package:bloc_test/bloc_test.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:mocktail/mocktail.dart';
@@ -16,6 +17,12 @@ void main() {
   late _MockVerifySeedCubit verifySeedCubit;
   late MockHomeBloc homeBloc;
 
+  // VerifySeedView toggles screenshot protection in initState/dispose via the
+  // no_screenshot method channel. Stub it so the render does not throw a
+  // MissingPluginException in the headless golden harness.
+  const noScreenshotChannel =
+      MethodChannel('com.flutterplaza.no_screenshot_methods');
+
   setUp(() {
     verifySeedCubit = _MockVerifySeedCubit();
     homeBloc = MockHomeBloc();
@@ -26,6 +33,13 @@ void main() {
       ),
     );
     when(() => homeBloc.state).thenReturn(const HomeState());
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+        .setMockMethodCallHandler(noScreenshotChannel, (_) async => true);
+  });
+
+  tearDown(() {
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+        .setMockMethodCallHandler(noScreenshotChannel, null);
   });
 
   Widget buildSubject() => MultiBlocProvider(

test/screens/verify_seed/verify_seed_page_test.dart

@@ -1,5 +1,6 @@
 import 'package:bloc_test/bloc_test.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_svg/svg.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -182,6 +183,36 @@ void main() {
       });
     });
 
+    // The verify-seed screen (where the user re-enters real seed words) had no
+    // screenshot protection, unlike the sibling seed screens. It must disable
+    // screenshots on init and re-enable on dispose so it never lands in the
+    // app-switcher snapshot / a recording.
+    testWidgets('disables screenshots on init and re-enables on dispose',
+        (tester) async {
+      const channel = MethodChannel('com.flutterplaza.no_screenshot_methods');
+      final calls = <String>[];
+      tester.binding.defaultBinaryMessenger.setMockMethodCallHandler(
+        channel,
+        (call) async {
+          calls.add(call.method);
+          return true;
+        },
+      );
+      addTearDown(
+        () => tester.binding.defaultBinaryMessenger
+            .setMockMethodCallHandler(channel, null),
+      );
+
+      await tester.pumpApp(buildSubject(const VerifySeedView()));
+      expect(calls, contains('screenshotOff'),
+          reason: 'seed screen must block screenshots on init');
+
+      // Replace the screen so VerifySeedView is disposed.
+      await tester.pumpApp(buildSubject(const SizedBox.shrink()));
+      expect(calls, contains('screenshotOn'),
+          reason: 'leaving the seed screen must re-enable screenshots');
+    });
+
     group('$BlocListener', () {
       testWidgets('sends $LoadWalletEvent with the committed wallet when verified',
           (tester) async {