fix: Task 7 review round 1 - copy the raw admin label verbatim on duplicate

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

src/Integrations/Divi/Pages/DiviDuplicateNodeAbility.php

@@ -7,7 +7,6 @@ namespace LIT\MCP\Integrations\Divi\Pages;
 use LIT\MCP\Abilities\Ability;
 use LIT\MCP\Abilities\ToolResult;
 use LIT\MCP\Integrations\Divi\BlockTree\AttrMap;
-use LIT\MCP\Integrations\Divi\BlockTree\NodeSummary;
 use WP_Error;
 
 /**
@@ -86,10 +85,16 @@ final class DiviDuplicateNodeAbility implements Ability
 
         $copy = $this->writer->composition($page)->editor()->duplicate($page->index, $node);
         if ($copy->isDivi() && ! $copy->isOpaque()) {
-            $label = NodeSummary::label($node);
-            $copy->setAttrs(AttrMap::set($copy->attrs(), 'module.meta.adminLabel', [
-                'desktop' => ['value' => ($label === '' ? $node->shortName() : $label) . ' (Kopie)'],
-            ]));
+            // The raw stored desktop value (never NodeSummary::label()'s display-shortened
+            // text): a long or multi-line label must be copied verbatim, only " (Kopie)" added.
+            // Setting only the ".desktop.value" leaf keeps every other breakpoint untouched.
+            $raw = AttrMap::desktop($node->attrs(), 'module.meta.adminLabel');
+            $label = is_string($raw) ? $raw : '';
+            $copy->setAttrs(AttrMap::set(
+                $copy->attrs(),
+                'module.meta.adminLabel.desktop.value',
+                ($label === '' ? $node->shortName() : $label) . ' (Kopie)'
+            ));
         }
 
         $change = (new DiviChange(sprintf('Knoten %s dupliziert', $id)))->changed($copy, 'duplicated');