Remove repeated demo notes from product screens (#28)

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(