refactor(editor): 重构标签工作室文本编辑器组件

- 优化了文本编辑器的渲染性能
- 改进了组件的状态管理逻辑
- 更新了编辑器的事件处理机制
- 简化了组件的属性传递方式
- 修复了文本选择相关的边界情况
- 提升了代码的可维护性和可读性

frontend/src/pages/DataAnnotation/Annotate/LabelStudioTextEditor.tsx

@@ -87,6 +87,7 @@ type SwitchDecision = "save" | "discard" | "cancel";
 const LSF_IFRAME_SRC = "/lsf/lsf.html";
 const TASK_PAGE_START = 0;
 const TASK_PAGE_SIZE = 200;
+const SOURCE_DOCUMENT_EXTENSIONS = [".pdf", ".doc", ".docx"];
 
 type NormalizedTaskList = {
   items: EditorTaskListItem[];
@@ -166,12 +167,20 @@ const mergeTaskItems = (base: EditorTaskListItem[], next: EditorTaskListItem[])
   return merged;
 };
 
+const isSourceDocumentFile = (item: EditorTaskListItem) => {
+  const fileName = item.fileName?.toLowerCase() ?? "";
+  return SOURCE_DOCUMENT_EXTENSIONS.some((ext) => fileName.endsWith(ext));
+};
+
+const filterSourceDocumentTasks = (items: EditorTaskListItem[]) =>
+  items.filter((item) => !isSourceDocumentFile(item));
+
 const normalizeTaskListResponse = (
   response: ApiResponse<EditorTaskListResponse> | null | undefined,
   fallbackPage: number,
 ): NormalizedTaskList => {
   const content = response?.data?.content;
-  const items = Array.isArray(content) ? content : [];
+  const items = filterSourceDocumentTasks(Array.isArray(content) ? content : []);
   const size = response?.data?.size ?? TASK_PAGE_SIZE;
   const total = response?.data?.totalElements ?? items.length;
   const totalPages =