fix(favoritos): header actions row, chip colours

Audit 4.1 (t4:216): the manage-groups (create_new_folder) and sort
(swap_vert) actions now live in PluriRootHeader's own actions slot as
two icon buttons -- were an ActionChip inside the chip strip plus a
PopupMenuButton sharing a Row with it. The prototype's own back arrow
stays absent (binding decision: this root keeps its bottom tab bar,
unlike the prototype's pushed-with-back-arrow shape) -- this closes
the remaining gap in what was a partial fix.

Audit 4.2 (t4:219-221): group filter chips are solid brand teal with
dark text when active, listSurface + a faint border when not -- was
Material's own ChoiceChip theming (electricMagenta@24% selected).

Updated pantalla_favoritos_test.dart's two "Manage lists" text finders
to locate the relocated action by key instead (the action is now an
icon-only IconButton with a tooltip, not a labelled chip).

lib/pantallas/pantalla_favoritos.dart

@@ -6,6 +6,7 @@ import '../l10n/display_names.dart';
 import '../l10n/gen/app_localizations.dart';
 import '../modelos/emisora.dart';
 import '../modelos/grupo_favoritos.dart';
+import '../tema/pluriwave_tokens.dart';
 import '../widgets/fila_emisora_plana.dart';
 import '../widgets/pluri_icon.dart';
 import '../widgets/pluri_layout.dart';
@@ -186,22 +187,23 @@ class _PantallaFavoritosState extends State<PantallaFavoritos> {
           children: [
             // S1/S2 (Tier 1 visual fidelity): see the empty-state branch
             // above — PluriScreenHeader is retired everywhere.
+            //
+            // Audit 4.1 (t4:216): the prototype's two header icon actions
+            // (create_new_folder, swap_vert) now live in PluriRootHeader's
+            // own actions slot -- they used to be scattered as an
+            // ActionChip inside the chip strip and a PopupMenuButton
+            // sharing a Row with it. The back arrow the prototype also
+            // draws stays absent (binding decision: this root keeps its
+            // bottom tab bar, unlike the prototype's own pushed shape).
             PluriRootHeader(
               title: l10n.favoritesTitle,
               onSleepTimer: () => showPluriSleepTimerSheet(context),
-            ),
+              actions: [
-            const SizedBox(height: 12),
+                IconButton(
-            Row(
+                  key: const ValueKey('favorites-manage-groups-action'),
-              children: [
+                  icon: const Icon(Icons.create_new_folder_rounded),
-                Expanded(
+                  tooltip: l10n.favoriteGroupsManage,
-                  child: _FilaChipsGrupos(
+                  onPressed: _abrirGestionDeListas,
-                    grupos: gruposVisibles,
-                    favoritos: favoritos,
-                    seleccionado: seleccionEfectiva,
-                    onSeleccionar:
-                        (id) => setState(() => _grupoSeleccionadoId = id),
-                    onGestionar: _abrirGestionDeListas,
-                  ),
                 ),
                 PopupMenuButton<OrdenEmisoras>(
                   icon: const Icon(Icons.swap_vert_rounded),
@@ -221,6 +223,13 @@ class _PantallaFavoritosState extends State<PantallaFavoritos> {
                 ),
               ],
             ),
+            const SizedBox(height: 12),
+            _FilaChipsGrupos(
+              grupos: gruposVisibles,
+              favoritos: favoritos,
+              seleccionado: seleccionEfectiva,
+              onSeleccionar: (id) => setState(() => _grupoSeleccionadoId = id),
+            ),
           ],
         ),
       ),
@@ -256,18 +265,45 @@ class _FilaChipsGrupos extends StatelessWidget {
     required this.favoritos,
     required this.seleccionado,
     required this.onSeleccionar,
-    required this.onGestionar,
   });
 
   final List<GrupoFavoritos> grupos;
   final List<Emisora> favoritos;
   final String? seleccionado;
   final ValueChanged<String?> onSeleccionar;
-  final VoidCallback onGestionar;
 
   String _nombreVisible(AppLocalizations l10n, GrupoFavoritos grupo) =>
       grupo.esSinAsignar ? l10n.favoriteGroupsUnassigned : grupo.nombre;
 
+  /// Audit 4.2 (t4:219-221): active `#21D4D9`/`#062126` w800, inactive
+  /// `listSurface` + a faint border / w700 -- was Material's own
+  /// `ChoiceChip` theming (a plain checkbox-style selected fill).
+  Widget _chip({
+    required String label,
+    required bool selected,
+    required VoidCallback onTap,
+  }) {
+    return ChoiceChip(
+      label: Text(label),
+      labelStyle: TextStyle(
+        fontWeight: selected ? FontWeight.w800 : FontWeight.w700,
+        color: selected ? const Color(0xFF062126) : const Color(0xFFF2F7FA),
+      ),
+      selected: selected,
+      showCheckmark: false,
+      selectedColor: PluriWaveTokens.brand,
+      backgroundColor: PluriWaveTokens.dark.listSurface,
+      side: BorderSide(
+        color:
+            selected
+                ? Colors.transparent
+                : Colors.white.withValues(alpha: 0.09),
+      ),
+      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
+      onSelected: (_) => onTap(),
+    );
+  }
+
   @override
   Widget build(BuildContext context) {
     final l10n = AppLocalizations.of(context);
@@ -278,38 +314,27 @@ class _FilaChipsGrupos extends StatelessWidget {
         children: [
           Padding(
             padding: const EdgeInsets.only(right: 8),
-            child: ChoiceChip(
+            child: _chip(
-              label: Text(
+              label: l10n.favoriteGroupsChipLabel(
-                l10n.favoriteGroupsChipLabel(
+                l10n.favoritesFilterAllLabel,
-                  l10n.favoritesFilterAllLabel,
+                favoritos.length,
-                  favoritos.length,
-                ),
               ),
               selected: seleccionado == null,
-              onSelected: (_) => onSeleccionar(null),
+              onTap: () => onSeleccionar(null),
             ),
           ),
           for (final grupo in grupos)
             Padding(
               padding: const EdgeInsets.only(right: 8),
-              child: ChoiceChip(
+              child: _chip(
-                label: Text(
+                label: l10n.favoriteGroupsChipLabel(
-                  l10n.favoriteGroupsChipLabel(
+                  _nombreVisible(l10n, grupo),
-                    _nombreVisible(l10n, grupo),
+                  favoritos.where((e) => e.grupoFavoritosId == grupo.id).length,
-                    favoritos
-                        .where((e) => e.grupoFavoritosId == grupo.id)
-                        .length,
-                  ),
                 ),
                 selected: seleccionado == grupo.id,
-                onSelected: (_) => onSeleccionar(grupo.id),
+                onTap: () => onSeleccionar(grupo.id),
               ),
             ),
-          ActionChip(
-            avatar: const Icon(Icons.add_rounded, size: 18),
-            label: Text(l10n.favoriteGroupsManage),
-            onPressed: onGestionar,
-          ),
         ],
       ),
     );

test/pantallas/pantalla_favoritos_test.dart

@@ -357,7 +357,12 @@ void main() {
       await tester.pumpWidget(buildScreen(estado));
       await pumpStable(tester);
 
-      await tester.tap(find.text('Manage lists'));
+      // Audit 4.1 (t4:216): the manage-groups action moved into the
+      // header as a create_new_folder icon button, replacing the old
+      // "Manage lists" ActionChip in the chip strip.
+      await tester.tap(
+        find.byKey(const ValueKey('favorites-manage-groups-action')),
+      );
       await pumpStable(tester);
 
       // "Group Management Reachable from Favoritos": the SAME screen
@@ -385,7 +390,10 @@ void main() {
       await tester.pumpAndSettle();
 
       expect(find.byType(PantallaAjustesGruposFavoritos), findsNothing);
-      expect(find.text('Manage lists'), findsOneWidget);
+      expect(
+        find.byKey(const ValueKey('favorites-manage-groups-action')),
+        findsOneWidget,
+      );
 
       await estado.crearGrupoFavoritos('Road trip');
       await pumpStable(tester);
@@ -494,6 +502,32 @@ void main() {
       },
     );
   });
+
+  group('visual fidelity (audit 4.2)', () {
+    testWidgets('the active group chip is solid brand teal with dark text; '
+        'inactive chips use listSurface (t4:219-221)', (tester) async {
+      setLargeSurface(tester);
+      _suppressListTileInkAssertion();
+      final estado = await crearEstadoConFavoritos();
+      addTearDown(estado.dispose);
+
+      await tester.pumpWidget(buildScreen(estado));
+      await pumpStable(tester);
+
+      final activo = tester.widget<ChoiceChip>(
+        find.widgetWithText(ChoiceChip, 'All · 3'),
+      );
+      expect(activo.selected, isTrue);
+      expect(activo.selectedColor, const Color(0xFF21D4D9));
+      expect(activo.labelStyle?.color, const Color(0xFF062126));
+
+      final inactivo = tester.widget<ChoiceChip>(
+        find.widgetWithText(ChoiceChip, 'Rock · 2'),
+      );
+      expect(inactivo.selected, isFalse);
+      expect(inactivo.backgroundColor, const Color(0xFF102532));
+    });
+  });
 }
 
 void setLargeSurface(WidgetTester tester) {