fix(favoritos,grabaciones): replace glass cards with flat rows

Item 23 / audit 4.3, 12.4 (t4:226-232, 616-619): Favoritos and
Grabaciones rows were full glass cards / ListTiles with two stacked
buttons and no artwork slot. Replace with flat, background-less rows
via a new shared FilaEmisoraPlana widget (square art, name+meta, a
circular play affordance) plus a bespoke Grabaciones row (44x12
placeholder art -- recordings carry no per-station favicon, so this
is a themed fallback, not invented artwork).

Favoritos keeps "Move to list" / "Remove from favorites" behind an
overflow menu (same underlying methods, unchanged) instead of two
always-visible buttons, since dropping either would be a functional
regression the prototype's own row doesn't have to solve for.

Also 12.1 (t4:610): the Grabaciones header action is folder_open, not
a generic gear.

test/pantallas/pantalla_favoritos_test.dart

@@ -6,7 +6,9 @@ import 'package:pluriwave/estado/estado_radio.dart';
 import 'package:pluriwave/l10n/gen/app_localizations.dart';
 import 'package:pluriwave/pantallas/ajustes/pantalla_ajustes_grupos_favoritos.dart';
 import 'package:pluriwave/pantallas/pantalla_favoritos.dart';
+import 'package:pluriwave/widgets/fila_emisora_plana.dart';
 import 'package:pluriwave/widgets/pluri_push_scaffold.dart';
+import 'package:pluriwave/widgets/tarjeta_emisora.dart';
 import 'package:provider/provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
@@ -381,6 +383,90 @@ void main() {
 
     expect(find.widgetWithText(TextFormField, 'Name *'), findsOneWidget);
   });
+
+  // Item 23 / audit 4.3 (t4:226-232): flat, background-less rows with a
+  // square thumbnail and a circular play affordance, replacing the full
+  // glass TarjetaEmisora card + two stacked filledTonal buttons.
+  group('Item 23 -- flat rows (audit 4.3)', () {
+    testWidgets(
+      'each row is a flat FilaEmisoraPlana, not the full glass card',
+      (tester) async {
+        setLargeSurface(tester);
+        _suppressListTileInkAssertion();
+        final estado = await crearEstadoConFavoritos();
+        addTearDown(estado.dispose);
+
+        await tester.pumpWidget(buildScreen(estado));
+        await pumpStable(tester);
+
+        expect(find.byType(FilaEmisoraPlana), findsNWidgets(3));
+        expect(
+          find.byType(TarjetaEmisora),
+          findsNothing,
+          reason: 'audit 4.3 replaces the full glass card with a flat row',
+        );
+        expect(
+          find.byIcon(Icons.drag_indicator_rounded),
+          findsNWidgets(3),
+          reason: 't4:227 drag_indicator, not drag_handle',
+        );
+        expect(find.byIcon(Icons.drag_handle_rounded), findsNothing);
+        expect(
+          find.byType(BotonReproducirCircular),
+          findsNWidgets(3),
+          reason: 't4:230 a circular play affordance per row',
+        );
+      },
+    );
+
+    testWidgets(
+      'the overflow menu offers exactly "Move to list" and "Remove from '
+      'favorites"',
+      (tester) async {
+        setLargeSurface(tester);
+        _suppressListTileInkAssertion();
+        final estado = await crearEstadoConFavoritos();
+        addTearDown(estado.dispose);
+
+        await tester.pumpWidget(buildScreen(estado));
+        await pumpStable(tester);
+
+        await tester.tap(find.byIcon(Icons.more_vert_rounded).first);
+        await tester.pumpAndSettle();
+
+        expect(find.text('Move to list'), findsOneWidget);
+        expect(find.text('Remove from favorites'), findsOneWidget);
+        expect(find.byType(PopupMenuItem<String>), findsNWidgets(2));
+      },
+    );
+
+    testWidgets(
+      '"Remove from favorites" still calls the same removal path as before',
+      (tester) async {
+        setLargeSurface(tester);
+        _suppressListTileInkAssertion();
+        final estado = await crearEstadoConFavoritos();
+        addTearDown(estado.dispose);
+
+        await tester.pumpWidget(buildScreen(estado));
+        await pumpStable(tester);
+
+        // Invoke the callback directly rather than opening the overlay and
+        // tapping its rendered item by screen position: leaving that modal
+        // route open while the tap it triggers removes and unmounts the
+        // very row that anchors it is a real hang hazard, confirmed while
+        // developing this test (multi-minute stall, same class of risk as
+        // the project's other documented `pumpAndSettle` traps).
+        final boton = tester.widget<PopupMenuButton<String>>(
+          find.byType(PopupMenuButton<String>).first,
+        );
+        boton.onSelected!('remove');
+        await pumpStable(tester);
+
+        expect(find.text('Station A'), findsNothing);
+      },
+    );
+  });
 }
 
 void setLargeSurface(WidgetTester tester) {

test/pantallas/pantalla_grabaciones_test.dart

@@ -8,6 +8,7 @@ import 'package:pluriwave/l10n/gen/app_localizations.dart';
 import 'package:pluriwave/modelos/archivo_grabacion.dart';
 import 'package:pluriwave/pantallas/pantalla_grabaciones.dart';
 import 'package:pluriwave/servicios/servicio_grabacion_radio.dart';
+import 'package:pluriwave/widgets/pluri_glass_surface.dart';
 import 'package:pluriwave/widgets/pluri_push_scaffold.dart';
 import 'package:provider/provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
@@ -137,7 +138,9 @@ void main() {
       );
       await pumpStable(tester);
 
-      await tester.tap(find.byIcon(Icons.settings_outlined));
+      // Audit 12.1 (t4:610): the header action icon is `folder_open`, not
+      // a generic gear.
+      await tester.tap(find.byIcon(Icons.folder_open_rounded));
       await pumpStable(tester);
 
       expect(find.byType(PluriPushScaffold), findsNWidgets(2));
@@ -194,6 +197,51 @@ void main() {
     expect(find.byIcon(Icons.play_circle_fill_rounded), findsNWidgets(3));
   });
 
+  // Item 23 / audit 12.4 (t4:616-619): flat, background-less rows with a
+  // 44x44/radius-12 thumbnail placeholder -- replacing the PluriGlassSurface
+  // + ListTile card, which had no artwork slot at all.
+  testWidgets(
+    'rows are flat -- no ListTile, no per-row PluriGlassSurface -- with a '
+    '44x44/radius-12 thumbnail placeholder',
+    (tester) async {
+      final estado = EstadoGrabacion(
+        servicio: _FakeServicioGrabacionConArchivos([
+          fijaA,
+          fijaB,
+        ], maxBytesFijo: 200 * 1024 * 1024),
+      );
+      addTearDown(estado.dispose);
+
+      await tester.pumpWidget(
+        buildScreen(
+          estado: estado,
+          reproductor: _ReproductorGrabacionesFake(const {}),
+        ),
+      );
+      await pumpStable(tester);
+
+      expect(
+        find.byType(ListTile),
+        findsNothing,
+        reason: 'audit 12.4 replaces the ListTile row with a flat Row',
+      );
+      expect(
+        find.byType(PluriGlassSurface),
+        findsOneWidget,
+        reason: 'only the storage card keeps a surface -- rows do not',
+      );
+
+      final miniaturas = find.byKey(const ValueKey('fila-grabacion-arte'));
+      expect(miniaturas, findsNWidgets(2));
+      expect(tester.getSize(miniaturas.first), const Size(44, 44));
+      final clip = tester.widget<ClipRRect>(miniaturas.first);
+      expect(
+        (clip.borderRadius as BorderRadius).topLeft,
+        const Radius.circular(12),
+      );
+    },
+  );
+
   testWidgets('15.2-B: empty folder renders an empty state, not an error', (
     tester,
   ) async {