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

lib/modelos/emisora.dart

@@ -136,7 +136,11 @@ class Emisora {
   /// Lista de géneros/tags como lista limpia.
   List<String> get generos {
     if (tags == null || tags!.isEmpty) return [];
-    return tags!.split(',').map((t) => t.trim()).where((t) => t.isNotEmpty).toList();
+    return tags!
+        .split(',')
+        .map((t) => t.trim())
+        .where((t) => t.isNotEmpty)
+        .toList();
   }
 
   static String? _nonEmpty(String? s) =>
@@ -148,7 +152,9 @@ class Emisora {
   @override
   bool operator ==(Object other) =>
       identical(this, other) ||
-      other is Emisora && runtimeType == other.runtimeType && uuid == other.uuid;
+      other is Emisora &&
+          runtimeType == other.runtimeType &&
+          uuid == other.uuid;
 
   @override
   int get hashCode => uuid.hashCode;