feat(quality): harden lint rules and add quality-gate tests

lib/servicios/servicio_favoritos.dart

@@ -18,9 +18,9 @@ class ServicioFavoritos {
     DatabaseFactory? databaseFactory,
     Future<String> Function()? databasePathProvider,
     String? databaseName,
-  })  : _databaseFactory = databaseFactory,
-        _databasePathProvider = databasePathProvider ?? getDatabasesPath,
-        _databaseName = databaseName ?? _dbName;
+  }) : _databaseFactory = databaseFactory,
+       _databasePathProvider = databasePathProvider ?? getDatabasesPath,
+       _databaseName = databaseName ?? _dbName;
 
   final DatabaseFactory? _databaseFactory;
   final Future<String> Function() _databasePathProvider;
@@ -175,7 +175,8 @@ class ServicioFavoritos {
   Future<GrupoFavoritos> crearGrupo(String nombre) async {
     final db = await _database;
     final normalizado = _normalizarNombreGrupo(nombre);
-    final maxOrden = Sqflite.firstIntValue(
+    final maxOrden =
+        Sqflite.firstIntValue(
           await db.rawQuery('SELECT MAX(orden) FROM grupos_favoritos'),
         ) ??
         0;
@@ -232,7 +233,8 @@ class ServicioFavoritos {
 
   Future<void> asignarGrupo(String uuid, String grupoId) async {
     final db = await _database;
-    final existe = Sqflite.firstIntValue(
+    final existe =
+        Sqflite.firstIntValue(
           await db.rawQuery(
             'SELECT COUNT(*) FROM grupos_favoritos WHERE id = ?',
             [grupoId],
@@ -250,7 +252,8 @@ class ServicioFavoritos {
 
   Future<void> agregar(Emisora emisora) async {
     final db = await _database;
-    final maxOrden = Sqflite.firstIntValue(
+    final maxOrden =
+        Sqflite.firstIntValue(
           await db.rawQuery('SELECT MAX(orden) FROM favoritos'),
         ) ??
         -1;
@@ -273,10 +276,9 @@ class ServicioFavoritos {
   Future<bool> esFavorito(String uuid) async {
     final db = await _database;
     final count = Sqflite.firstIntValue(
-      await db.rawQuery(
-        'SELECT COUNT(*) FROM favoritos WHERE uuid = ?',
-        [uuid],
-      ),
+      await db.rawQuery('SELECT COUNT(*) FROM favoritos WHERE uuid = ?', [
+        uuid,
+      ]),
     );
     return (count ?? 0) > 0;
   }