feat: 添加选择图层下所有对象的功能，优化图层交互性管理

src/component/Canvas/CanvasEditor/components/LayersPanel/LayersPanel.vue

@@ -590,6 +590,8 @@ function handleLayerClick(layer, event) {
         // 否则直接设置当前图层为活动图层
         setActiveLayer(layer.id);
         layerManager?.updateLayersObjectsInteractivity();
+        // 选中画布中的图层对象
+        layerManager?.selectLayerObjects(layer.id);
       }
     }
     lastSelectedIndex.value = sortableRootLayers.value.findIndex((l) => l.id === layer.id);