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.

lib/pantallas/pantalla_favoritos.dart

@@ -6,13 +6,13 @@ import '../l10n/display_names.dart';
 import '../l10n/gen/app_localizations.dart';
 import '../modelos/emisora.dart';
 import '../modelos/grupo_favoritos.dart';
+import '../widgets/fila_emisora_plana.dart';
 import '../widgets/pluri_icon.dart';
 import '../widgets/pluri_layout.dart';
 import '../widgets/pluri_premium_widgets.dart';
 import '../widgets/pluri_push_scaffold.dart';
 import '../widgets/pluri_root_header.dart';
 import '../widgets/pluri_sleep_timer_sheet.dart';
-import 'package:pluriwave/widgets/tarjeta_emisora.dart';
 import 'ajustes/pantalla_ajustes_emisoras_personalizadas.dart';
 import 'ajustes/pantalla_ajustes_grupos_favoritos.dart';
 
@@ -399,45 +399,65 @@ class _FilaFavorito extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final l10n = AppLocalizations.of(context);
-    return Padding(
-      padding: const EdgeInsets.only(bottom: 8),
-      child: Row(
-        children: [
-          ReorderableDragStartListener(
-            index: index,
-            child: const Padding(
-              padding: EdgeInsets.only(right: 4),
-              child: Icon(Icons.drag_handle_rounded),
-            ),
-          ),
-          Expanded(
-            child: TarjetaEmisora(
-              key: Key(emisora.uuid),
-              emisora: emisora,
-              esCompacta: true,
-              onTap: () => reproducirMinimizado(context, emisora),
-            ),
-          ),
-          const SizedBox(width: 6),
-          Column(
-            mainAxisSize: MainAxisSize.min,
-            children: [
-              IconButton.filledTonal(
-                tooltip: l10n.favoriteGroupsAssignSubtitle(
-                  _nombreVisible(l10n, grupoActual),
-                ),
-                icon: const Icon(Icons.drive_file_move_rounded),
-                onPressed: () => _asignar(context),
-              ),
-              IconButton.filledTonal(
-                tooltip: l10n.favoritesRemoveTooltip,
-                icon: const Icon(Icons.delete_outline_rounded),
-                onPressed: () => _eliminar(context),
-              ),
-            ],
-          ),
-        ],
+    final meta = [
+      emisora.pais,
+      emisora.idioma,
+    ].where((s) => s != null && s.isNotEmpty).join(' · ');
+
+    // Item 23 / audit 4.3 (t4:226-232): a flat, background-less row --
+    // drag handle, square art, name+meta, and a circular play affordance --
+    // replacing the full glass TarjetaEmisora card and its two stacked
+    // filledTonal buttons. "Move to list"/"Remove from favorites" keep their
+    // EXACT prior logic (`_asignar`/`_eliminar`, untouched), now reachable
+    // from an overflow menu instead of two always-visible buttons -- the
+    // prototype's row has no such menu, but dropping either capability
+    // entirely would be a functional regression, not a fidelity fix.
+    return FilaEmisoraPlana(
+      key: Key(emisora.uuid),
+      emisora: emisora,
+      meta: meta,
+      onTap: () => reproducirMinimizado(context, emisora),
+      leading: ReorderableDragStartListener(
+        index: index,
+        child: Icon(
+          // t4:227: drag_indicator, not drag_handle, at 22px/28%.
+          Icons.drag_indicator_rounded,
+          size: 22,
+          color: Theme.of(
+            context,
+          ).colorScheme.onSurface.withValues(alpha: 0.28),
+        ),
       ),
+      trailing: [
+        BotonReproducirCircular(
+          onPressed: () => reproducirMinimizado(context, emisora),
+        ),
+        PopupMenuButton<String>(
+          icon: Icon(
+            Icons.more_vert_rounded,
+            size: 20,
+            color: Theme.of(
+              context,
+            ).colorScheme.onSurface.withValues(alpha: 0.45),
+          ),
+          constraints: const BoxConstraints.tightFor(width: 38, height: 42),
+          onSelected: (accion) {
+            if (accion == 'assign') _asignar(context);
+            if (accion == 'remove') _eliminar(context);
+          },
+          itemBuilder:
+              (context) => [
+                PopupMenuItem(
+                  value: 'assign',
+                  child: Text(l10n.favoriteGroupsAssign),
+                ),
+                PopupMenuItem(
+                  value: 'remove',
+                  child: Text(l10n.favoritesRemoveTooltip),
+                ),
+              ],
+        ),
+      ],
     );
   }
 }