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/Fixtures/divi/metadata-sample.json

@@ -4345,6 +4345,92 @@
                     }
                 }
             }
+        },
+        {
+            "name": "divi/post-content",
+            "title": "Post Content",
+            "category": "module",
+            "appearance": {
+                "multiple": false,
+                "multipleAliases": [
+                    "divi/fullwidth-post-content"
+                ],
+                "themeBuilderLayouts": [
+                    "body"
+                ]
+            },
+            "attributes": {
+                "module": {
+                    "settings": {
+                        "meta": {
+                            "meta": []
+                        },
+                        "advanced": {
+                            "html": []
+                        },
+                        "decoration": {
+                            "animation": [],
+                            "attributes": [],
+                            "background": [],
+                            "bodyFont": [],
+                            "border": [],
+                            "boxShadow": [],
+                            "conditions": [],
+                            "disabledOn": [],
+                            "filters": [],
+                            "interactions": [],
+                            "headingFont": [],
+                            "overflow": [],
+                            "order": [],
+                            "position": [],
+                            "scroll": [],
+                            "sizing": [],
+                            "spacing": [],
+                            "sticky": [],
+                            "transform": [],
+                            "zIndex": []
+                        }
+                    }
+                },
+                "image": {
+                    "settings": {
+                        "decoration": {
+                            "border": {
+                                "groupType": "group-item",
+                                "item": {
+                                    "groupSlug": "designImage",
+                                    "priority": 10,
+                                    "render": true,
+                                    "component": {
+                                        "type": "group",
+                                        "name": "divi/border",
+                                        "props": {
+                                            "grouped": false,
+                                            "fieldLabel": "Image"
+                                        }
+                                    }
+                                }
+                            },
+                            "boxShadow": {
+                                "groupType": "group-item",
+                                "item": {
+                                    "groupSlug": "designImage",
+                                    "priority": 15,
+                                    "render": true,
+                                    "component": {
+                                        "type": "group",
+                                        "name": "divi/box-shadow",
+                                        "props": {
+                                            "grouped": false,
+                                            "fieldLabel": "Image"
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
         }
     ],
     "defaults": {
@@ -4887,6 +4973,7 @@
                     }
                 }
             }
-        }
+        },
+        "divi/post-content": []
     }
 }