feat(templates): add archive-header and post-grid components

- Add ArchiveHeader component (schema, renderer, formbuilder)
- Add PostGrid component (schema, renderer, formbuilder)
- Unify archive templates (home, archive, category, tag,
  author, date, search)
- Add page visibility system with VisibilityDefaults
- Register components in AdminDashboardRenderer
- Fix boolean conversion in functions-addon.php
- All 172 unit tests passed

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Shared/Application/UseCases/EvaluatePageVisibility/EvaluatePageVisibilityUseCase.php

@@ -22,15 +22,15 @@ final class EvaluatePageVisibilityUseCase
     ) {}
 
     /**
-     * Evalúa si el componente debe mostrarse en la página actual
+     * Evalua si el componente debe mostrarse en la pagina actual
      */
     public function execute(string $componentName): bool
     {
         $config = $this->visibilityRepository->getVisibilityConfig($componentName);
 
         if (empty($config)) {
-            // Usar constante compartida (DRY)
-            $config = VisibilityDefaults::DEFAULT_VISIBILITY;
+            // Usar defaults especificos por componente si existen
+            $config = VisibilityDefaults::getForComponent($componentName);
         }
 
         $pageType = $this->pageTypeDetector->detect();