fix(paises): correct the gap between the language and country lists

Issue 3 (feedback-pruebas): t4:260 draws a 14px gap between "Tus
idiomas" and "Todos", not 16.

lib/pantallas/pantalla_paises.dart

@@ -134,7 +134,12 @@ class _PantallaPaisesState extends State<PantallaPaises> {
                     ),
                   if (query.isEmpty) ...[
                     _seccionTusIdiomas(context, estado.paises, l10n),
-                    const SizedBox(height: 16),
+                    // Issue 3 (feedback-pruebas): t4:260 draws a 14px gap
+                    // between "Tus idiomas" and "Todos", not 16.
+                    const SizedBox(
+                      height: 14,
+                      key: ValueKey('paises-seccion-gap'),
+                    ),
                     _seccionTodos(context, estado.paises, l10n),
                   ] else
                     _seccionTodos(context, paisesFiltrados, l10n),

test/pantallas/pantalla_paises_test.dart

@@ -262,6 +262,27 @@ void main() {
 
       expect(find.byIcon(Icons.search_rounded), findsOneWidget);
     });
+
+    testWidgets('Issue 3 (feedback-pruebas): the gap between "Tus idiomas" and '
+        '"Todos" is 14, matching t4:260 -- not 16', (tester) async {
+      final estado = EstadoBusqueda(
+        radio: FakeServicioRadio(
+          paises: const [
+            PaisRadio(nombre: 'Spain', codigoIso: 'ES', numeroEmisoras: 482),
+          ],
+        ),
+      );
+      addTearDown(estado.dispose);
+
+      await tester.pumpWidget(buildScreen(estado));
+      await pumpEstable(tester);
+
+      expect(
+        tester.getSize(find.byKey(const ValueKey('paises-seccion-gap'))).height,
+        14,
+        reason: 't4:260 draws a 14px gap between the two eyebrow sections',
+      );
+    });
   });
 
   testWidgets(