feat: Divi tools edit Theme Builder layouts; visible layouts need confirm

TB layouts load through ThemeBuilderAccess (P12), live layouts (attached +
enabled, Q8) need a dry run and confirm (Q9) and get the shared restore point
of VisibleEdits, extracted from GlobalEdits (Q2: backup when revisions are
off, P9 refusals, P14 naming). divi/post-content only in body layouts (F22),
also for nested stored nodes. SaveScope::ThemeBuilderLayout sets Divi flags
and clears site CSS + TB cache.

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

src/Integrations/Divi/Compose/StructureRules.php

@@ -6,6 +6,7 @@ namespace LIT\MCP\Integrations\Divi\Compose;
 
 use LIT\MCP\Integrations\Divi\BlockTree\AttrMap;
 use LIT\MCP\Integrations\Divi\BlockTree\Block;
+use LIT\MCP\Integrations\Divi\BlockTree\GlobalInstance;
 use LIT\MCP\Integrations\Divi\Schema\ModuleCatalog;
 
 defined('ABSPATH') || exit;
@@ -18,7 +19,8 @@ defined('ABSPATH') || exit;
  * rules limit the depth); parent module → its child modules (catalog). Columns only come with
  * their row; specialty sections, specialty columns (module.advanced.specialtyColumns or
  * row-inner children, ColumnModule.php:306-324) and read-only nodes (opaque, non-Divi) are not
- * rebuilt. Pure PHP.
+ * rebuilt. F22: in Theme Builder layouts only modules Divi renders there (appearance.themeBuilderLayouts,
+ * e.g. divi/post-content only in the body). Pure PHP.
  */
 final class StructureRules
 {
@@ -26,7 +28,8 @@ final class StructureRules
     private const ROWS = ['divi/row', 'divi/row-inner'];
     private const FULLWIDTH = 'fullwidth-module';
 
-    public function __construct(private ModuleCatalog $catalog)
+    /** @param ?string $themeBuilderArea "header", "body" or "footer" when the entry is a Theme Builder layout. */
+    public function __construct(private ModuleCatalog $catalog, private ?string $themeBuilderArea = null)
     {
     }
 
@@ -37,6 +40,11 @@ final class StructureRules
             return sprintf('unbekanntes Modul "%s" (siehe lit-divi-catalog)', $child);
         }
 
+        $area = $this->areaViolation($child);
+        if ($area !== null) {
+            return $area;
+        }
+
         if ($parent === null) {
             return $child === 'divi/section' ? null : 'auf oberster Ebene sind nur Abschnitte (section) erlaubt';
         }
@@ -116,4 +124,41 @@ final class StructureRules
 
         return $child === 'divi/row' ? null : 'ein Abschnitt enthält Zeilen (row)';
     }
+
+    /**
+     * F22 for stored nodes that arrive with their children (copy, library entry, duplicate): the first module
+     * below $block that Divi does not render in this Theme Builder area; null for pages.
+     */
+    public function nestedAreaViolation(Block $block): ?string
+    {
+        if ($this->themeBuilderArea === null) {
+            return null;
+        }
+
+        foreach ($block->children() as $child) {
+            $violation = $this->areaViolation(GlobalInstance::effectiveName($child))
+                ?? $this->nestedAreaViolation($child);
+            if ($violation !== null) {
+                return $violation;
+            }
+        }
+
+        return null;
+    }
+
+    /** F22: in a Theme Builder layout, a module Divi renders only in other areas (Divi's own render rule). */
+    private function areaViolation(string $child): ?string
+    {
+        $areas = $this->catalog->themeBuilderAreas($child);
+        if ($areas === null || $this->themeBuilderArea === null || in_array($this->themeBuilderArea, $areas, true)) {
+            return null;
+        }
+
+        return sprintf(
+            '%s zeigt Divi im Bereich „%s“ nicht (nur %s)',
+            $child,
+            $this->themeBuilderArea,
+            implode(', ', $areas)
+        );
+    }
 }