fix(php): toc fallback to raw content when filtered has no headings

When plugins like Thrive Visual Editor transform content for
non-logged users, headings may be removed from the filtered content.
This fix uses raw post_content as fallback when filtered content
has no headings but raw content does.

Also removes temporary debug logging added for diagnosis.

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

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

Shared/Infrastructure/Services/PageVisibilityHelper.php

@@ -43,15 +43,7 @@ final class PageVisibilityHelper
         $container = DIContainer::getInstance();
         $useCase = $container->getEvaluateComponentVisibilityUseCase();
 
-        $result = $useCase->execute($componentName);
-
-        // DEBUG: Log visibility evaluation
-        if ($componentName === 'table-of-contents') {
-            $isLoggedIn = is_user_logged_in();
-            error_log("PageVisibilityHelper DEBUG [{$componentName}] [" . ($isLoggedIn ? "LOGGED" : "GUEST") . "]: result=" . ($result ? "true" : "false"));
-        }
-
-        return $result;
+        return $useCase->execute($componentName);
     }
 
     /**