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/DiviWriterFixture.php

@@ -12,6 +12,7 @@ use LIT\MCP\Integrations\Divi\Pages\DiviSaver;
 use LIT\MCP\Integrations\Divi\Pages\DiviWriter;
 use LIT\MCP\Integrations\Divi\Pages\DynamicContentMap;
 use LIT\MCP\Integrations\Divi\Schema\DiviModules;
+use LIT\MCP\Integrations\Divi\ThemeBuilder\ThemeBuilderEdits;
 use Mockery;
 use Throwable;
 use WP_Post;
@@ -100,7 +101,8 @@ final class DiviWriterFixture
         array &$failures = [],
         bool $unfiltered = false,
         ?DiviPageLoader $loader = null,
-        ?GlobalEdits $globals = null
+        ?GlobalEdits $globals = null,
+        ?ThemeBuilderEdits $themeBuilder = null
     ): DiviWriter {
         $design = self::designReader();
 
@@ -110,7 +112,8 @@ final class DiviWriterFixture
             self::log(),
             $design,
             self::composition($design, $unfiltered),
-            $globals
+            $globals,
+            $themeBuilder
         );
     }
 }