refactor(Editor): 移除未使用的addContent2函数和全局暴露

清理不再使用的addContent2函数及其全局暴露，简化代码结构

src/views/Editor/CanvasTool/index2.vue

@@ -366,21 +366,6 @@ interface ContentItem {
   id?: string
 }
 
-const addContent2 = (data: ContentItem, type: number) => {
-  // contentList.value.push(data)
-  if (type === 2) {
-    const elements = currentSlide.value?.elements || []
-    const frameElement = elements.find((el: any) => el.type === 'frame' && (el.toolType === 45 || el.toolType === 15))
-    if (frameElement) {
-      slidesStore.updateElement({
-        id: frameElement.id,
-        props: { url: data.url }
-      })
-    }
-  }
-}
-
-Object.assign(window, { addContent2 })
 
 // 确认对话框状态
 const confirmDialogVisible = ref(false)