Remove repeated demo notes from product screens (#28)

frontend/app/test/routing_test.dart

@@ -129,7 +129,7 @@ void main() {
       same(router),
     );
     expect(find.byKey(const ValueKey('verification-verified')), findsOneWidget);
-    expect(find.text('Демоподтверждение\nзавершено.'), findsOneWidget);
+    expect(find.text('Ваша почта\nподтверждена.'), findsOneWidget);
   });
 
   testWidgets(

frontend/app/test/ux_analytics_test.dart

@@ -111,7 +111,7 @@ void main() {
   );
 
   testWidgets(
-    'signup to demo verification is correlated and never claims a business success',
+    'signup verification keeps simulated analytics with ordinary product copy',
     (tester) async {
       final sink = DummyAnalyticsService();
       await open(tester, '/', sink);
@@ -130,10 +130,10 @@ void main() {
         'example-password',
       );
       await tap(tester, find.byKey(const ValueKey('submit')));
-      expect(find.text('Demo email prepared.'), findsOneWidget);
-      expect(find.textContaining('We’ve sent you'), findsNothing);
+      expect(find.text('Check your inbox.'), findsOneWidget);
+      expect(find.textContaining('We’ve sent you'), findsOneWidget);
       await tap(tester, find.byKey(const ValueKey('demo-confirmation')));
-      expect(find.text('Demo verification\ncomplete.'), findsOneWidget);
+      expect(find.text('Your email\nis verified.'), findsOneWidget);
       expect(sink.events.map((e) => e.journeyId).toSet().length, 1);
       expect(sink.events.where((e) => e.terminal).length, 1);
       expect(

frontend/app/test/verification_test.dart

@@ -57,7 +57,7 @@ void main() {
           find.byKey(ValueKey('verification-${scenario.value}')),
           findsOneWidget,
         );
-        expect(find.textContaining('DEMO'), findsOneWidget);
+        expect(find.textContaining('DEMO'), findsNothing);
         expect(tester.takeException(), isNull);
       },
     );