fix(css-manager): add error logging to debug hook registration

- Wrap CustomCSSManager bootstrap in try-catch
- Log success message when WP_DEBUG is enabled
- Log detailed error with file/line on failure

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

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

functions.php

@@ -307,6 +307,7 @@ add_action('wp_footer', function() use ($container) {
  */
 // Registrar hooks de inyección CSS directamente (sin wrapper)
 if (!is_admin()) {
+    try {
         global $wpdb;
 
         $repository = new \ROITheme\Admin\CustomCSSManager\Infrastructure\Persistence\WordPressSnippetRepository($wpdb);
@@ -319,6 +320,13 @@ if (!is_admin()) {
         );
 
         $injector->register();
+
+        if (defined('WP_DEBUG') && WP_DEBUG) {
+            error_log('ROI Theme: CustomCSSManager hooks registered successfully');
+        }
+    } catch (\Throwable $e) {
+        error_log('ROI Theme: CustomCSSManager FAILED: ' . $e->getMessage() . ' in ' . $e->getFile() . ':' . $e->getLine());
+    }
 }
 
 // =============================================================================