fix: lit/divi-node-copy from a library entry needs the insert rights (I-1, L5)

A library entry as source now requires LibraryAccess::canInsert() (add_library,
writable library group) and follows lit-library-insert's Tools-tab state
(disabled -> unsupported). DiviPageLoader::library() gets its caller.

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

src/Integrations/Divi/DiviIntegration.php

@@ -58,13 +58,16 @@ final class DiviIntegration implements Integration
      *        "Divi-Bibliothek" not disabled, ruling P9); null = always.
      * @param (Closure(): bool)|null $diviWritable Whether lit/divi-insert is enabled – lit/divi-node-copy
      *        follows it (ruling P9, E9); null = always.
+     * @param (Closure(): bool)|null $libraryInsertable Whether lit/library-insert is enabled –
+     *        lit/divi-node-copy follows it for library entries as source (audit L5); null = always.
      */
     public function __construct(
         private ContentSchema $schema,
         private ChangeLog $log,
         ?Closure $libraryWritable = null,
         ?Closure $libraryVisible = null,
-        private ?Closure $diviWritable = null
+        private ?Closure $diviWritable = null,
+        private ?Closure $libraryInsertable = null
     ) {
         $this->modules = new DiviModules();
         $this->design = new DesignSystemReader();
@@ -119,7 +122,7 @@ final class DiviIntegration implements Integration
             new DiviDeleteAbility($writer),
             new DiviDuplicateNodeAbility($writer),
             new DiviReplaceTextAbility($this->schema, $loader, $writer),
-            new DiviNodeCopyAbility($writer, $loader, $this->diviWritable),
+            new DiviNodeCopyAbility($writer, $loader, $this->diviWritable, $this->libraryInsertable),
             new DiviDynamicSourcesAbility($this->schema, new DynamicContentMap(), $this->access->roles()),
         ];
     }