fix: library IDs stay hidden without library access (ruling P13)

Outline, node-get, write outlines, the render summary and replace-text's
opaque-node match name no library ID unless the library group is visible
and the user has divi_library; read-only still names them.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/Integrations/Divi/Pages/DiviPageLoader.php

@@ -41,6 +41,12 @@ final class DiviPageLoader
         return $this->library;
     }
 
+    /** Ruling P13: whether the Divi tools may name library IDs (no library access = never). */
+    public function libraryIdsVisible(): bool
+    {
+        return $this->library?->revealsIds() ?? false;
+    }
+
     /** Readers pass $forWrite = false (trashed entries may be read, like lit-content-get). */
     public function load(mixed $postId, bool $forWrite): DiviPage|WP_Error
     {