refactor(validators): Add support for injection components

Injection components (like theme-settings) are special components that:
- Don't render visual HTML (inject code into wp_head/wp_footer)
- Don't need visibility group (always enabled)
- Don't need CSSGeneratorInterface (output user-provided CSS)
- Don't need getVisibilityClasses (not responsive visual elements)

- Update Phase01Validator to skip visibility check for injection components
- Update Phase03Validator to skip CSS/visibility validations for injection components

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

shared/Infrastructure/Validators/Phase01Validator.php

@@ -21,6 +21,16 @@ final class Phase01Validator implements PhaseValidatorInterface
         'visual_effects', 'behavior', 'layout', 'links', 'icons', 'media', 'forms'
     ];
 
+    /**
+     * Componentes especiales que NO requieren grupo visibility
+     *
+     * Estos son componentes de inyeccion (no visuales) que:
+     * - NO renderizan HTML visual
+     * - Inyectan codigo en hooks (wp_head, wp_footer)
+     * - Siempre estan activos (controlados por campos vacios/llenos)
+     */
+    private const INJECTION_COMPONENTS = ['theme-settings'];
+
     public function validate(string $componentName, string $themePath): ValidationResult
     {
         $result = new ValidationResult();
@@ -53,8 +63,8 @@ final class Phase01Validator implements PhaseValidatorInterface
             $this->validateGroups($schema['groups'], $result);
         }
 
-        // 5. Validar campos obligatorios de visibilidad
-        $this->validateVisibilityFields($schema, $result);
+        // 5. Validar campos obligatorios de visibilidad (excepto componentes de inyeccion)
+        $this->validateVisibilityFields($schema, $componentName, $result);
 
         // Estadísticas
         $totalFields = $this->countTotalFields($schema);
@@ -184,8 +194,14 @@ final class Phase01Validator implements PhaseValidatorInterface
         }
     }
 
-    private function validateVisibilityFields(array $schema, ValidationResult $result): void
+    private function validateVisibilityFields(array $schema, string $componentName, ValidationResult $result): void
     {
+        // Componentes de inyeccion no requieren grupo visibility
+        if (in_array($componentName, self::INJECTION_COMPONENTS, true)) {
+            $result->addInfo("✓ Componente de inyección '{$componentName}' - grupo visibility no requerido");
+            return;
+        }
+
         if (!isset($schema['groups']['visibility'])) {
             $result->addError("Grupo 'visibility' es obligatorio y no está presente");
             return;