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>

tests/Support/ThemeBuilderFixtures.php

@@ -4,6 +4,8 @@ declare(strict_types=1);
 
 namespace LIT\MCP\Tests\Support;
 
+use LIT\MCP\Integrations\Divi\BlockTree\Parser;
+use LIT\MCP\Integrations\Divi\Pages\DiviPageLoader;
 use LIT\MCP\Integrations\Divi\ThemeBuilder\DiviThemeBuilder;
 use LIT\MCP\Integrations\Divi\ThemeBuilder\Template;
 use LIT\MCP\Integrations\Divi\ThemeBuilder\ThemeBuilderAccess;
@@ -146,6 +148,12 @@ final class ThemeBuilderFixtures
         );
     }
 
+    /** A loader with the library access of LibraryFixtures and $access (default: full TB rights, empty live list). */
+    public static function loader(?ThemeBuilderAccess $access = null): DiviPageLoader
+    {
+        return new DiviPageLoader(DiviFixtures::schema(), new Parser(), LibraryFixtures::access(), $access ?? self::access());
+    }
+
     /**
      * An excerpt of et_theme_builder_get_flat_template_settings_options() as the adapter returns it
      * (live DDEV dump 2026-09-27 plus the Pods type lit_person).