补齐 UI 状态持久化测试偏移字段

让当前 schema 夹具继续验证原有业务约束

apps/ai-game-creator-shell/src-tauri/src/ui_editor/persistence.rs

@@ -1126,8 +1126,10 @@ mod tests {
                             }
                             },
                         "children_display_mode": "Stack",
-                        "children": []
-                    }]
+                        "children": [],
+                        "offset": { "min": [0.0, 0.0], "max": [0.0, 0.0] }
+                    }],
+                    "offset": { "min": [0.0, 0.0], "max": [0.0, 0.0] }
                 }
             }],
             "ui_design_images": {
@@ -1309,7 +1311,8 @@ mod tests {
                     },
                         "component": null,
                     "children_display_mode": "Stack",
-                    "children": []
+                    "children": [],
+                    "offset": { "min": [0.0, 0.0], "max": [0.0, 0.0] }
                 }
             }],
             "ui_design_images": {
@@ -1543,7 +1546,8 @@ mod tests {
                         }
                         },
                     "children_display_mode": "Stack",
-                    "children": []
+                    "children": [],
+                    "offset": { "min": [0.0, 0.0], "max": [0.0, 0.0] }
                 }
             }],
             "ui_design_images": {