fix(iap): address code review defects in freemium/IAP change

Fixes 9 of 10 review findings (10th requires a manual Play Console
step, no code change):

1. app.dart/banner_anuncio_superior.dart: move the top SafeArea inside
   BannerAnuncioSuperior so it only reserves status-bar height when an
   ad actually renders, restoring edge-to-edge layout for premium and
   free-unloaded users.
2. servicio_anuncios.dart: bound every interstitial await (load,
   presentation, and the injected implementation itself) with
   injectable timeouts so a callback that never fires can no longer
   hang a caller.
3. estado_entitlement.dart/hoja_premium.dart: expose a typed
   resultadoUsuario signal for purchase/restore failures and
   restore-found-nothing, with dedicated localized messages
   (compraError, restauracionSinCompras) across all 13 locales --
   never the raw developer/exception string.
4. main.dart/servicio_consentimiento.dart: add a GDPR/UMP consent flow
   (ConsentInformation/ConsentForm) that gates Mobile Ads SDK init on
   canRequestAds(); premium users never see a consent form; failures
   degrade to no ads instead of crashing or blocking startup.
6. servicio_anuncios.dart: track real ad presentation
   (onAdShowedFullScreenContent) so a failed-to-show interstitial no
   longer consumes a session cap slot.
7. banner_anuncio_superior.dart: add an explicit load-attempted guard
   so repeated didChangeDependencies (e.g. entitlement notifyListeners
   during a purchase) can only ever trigger one banner load attempt.
8. servicio_anuncios.dart: make esPremium a required constructor
   parameter, matching the hardened contract already applied to
   EstadoAlarmas/EstadoGrabacion/EstadoRadio.
9. hoja_premium.dart: add a dedicated premiumActivo localized string
   instead of reusing the equalizer's equalizerActive translation,
   across all 13 locales.

All fixes implemented RED-first (failing test before production
code). Full suite: 1261 passed, 2 pre-existing skips, 0 failures.
flutter analyze: 5 pre-existing issues only, 0 new.

[version set]

test/app_test.dart

@@ -1,6 +1,12 @@
 import 'dart:io';
 
+import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:pluriwave/app.dart';
+import 'package:pluriwave/estado/estado_entitlement.dart';
+import 'package:pluriwave/servicios/servicio_anuncios.dart';
+import 'package:provider/provider.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 
 /// S1 (Tier 1 visual fidelity): the prototype (`t4`) never draws a global
 /// `AppBar` — every root owns its own 56px title row instead (see
@@ -69,4 +75,64 @@ void main() {
       reason: 'the tutorial carousel must run before the what-is-new dialog',
     );
   });
+
+  group(
+    'construirCuerpoPrincipal — banner y la status bar (FIX 1, code review)',
+    () {
+      setUp(() {
+        SharedPreferences.setMockInitialValues({});
+      });
+
+      Future<void> bombear(WidgetTester tester, {required bool premium}) async {
+        await tester.pumpWidget(
+          MediaQuery(
+            data: const MediaQueryData(padding: EdgeInsets.only(top: 44)),
+            child: MaterialApp(
+              home: MultiProvider(
+                providers: [
+                  ChangeNotifierProvider<EstadoEntitlement>(
+                    create: (_) => EstadoEntitlement(prefs: null),
+                  ),
+                  Provider<ServicioAnuncios>(
+                    create: (_) => ServicioAnuncios(esPremium: () => premium),
+                  ),
+                ],
+                child: Scaffold(
+                  body: construirCuerpoPrincipal(
+                    contenido: const Align(
+                      alignment: Alignment.topLeft,
+                      child: Text('contenido'),
+                    ),
+                  ),
+                ),
+              ),
+            ),
+          ),
+        );
+        await tester.pump();
+        await tester.pump(const Duration(milliseconds: 50));
+      }
+
+      testWidgets(
+        'usuario premium: el contenido arranca en y=0 -- edge-to-edge, sin '
+        'franja en blanco reservada para la status bar',
+        (tester) async {
+          await bombear(tester, premium: true);
+
+          expect(tester.getTopLeft(find.text('contenido')).dy, 0);
+        },
+      );
+
+      testWidgets(
+        'usuario free con el banner aún sin cargar: el contenido arranca '
+        'igualmente en y=0 -- misma posición edge-to-edge que antes del '
+        'cambio, no una franja reservada de 44px hasta que el ad cargue',
+        (tester) async {
+          await bombear(tester, premium: false);
+
+          expect(tester.getTopLeft(find.text('contenido')).dy, 0);
+        },
+      );
+    },
+  );
 }