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/Unit/Integrations/Divi/Schema/ModuleCatalogTest.php

@@ -239,4 +239,12 @@ final class ModuleCatalogTest extends TestCase
             }
         }
     }
+
+    public function testThemeBuilderAreasFromDivisAppearance(): void
+    {
+        $catalog = DiviFixtures::catalog();
+
+        self::assertSame(['body'], $catalog->themeBuilderAreas('divi/post-content'));
+        self::assertNull($catalog->themeBuilderAreas('divi/text'));
+    }
 }