feat(annotation): 添加文本标注编辑器中的段落树导航和自动跳转功能

- 引入 Tree 和 Empty 组件用于段落导航展示
- 实现分段树形结构数据生成和展示功能
- 添加自动跳转到下一个待标注文件或段落的功能
- 优化文件选择逻辑，优先选择未标注的文件
- 实现段落切换时的状态管理和依赖更新
- 添加段落树节点选中和展开状态控制
- 优化界面布局和滚动区域的高度计算

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

@@ -1,5 +1,5 @@
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
-import { App, Button, Card, List, Spin, Typography, Tag, Switch } from "antd";
+import { App, Button, Card, List, Spin, Typography, Tag, Switch, Tree, Empty } from "antd";
 import { LeftOutlined, ReloadOutlined, SaveOutlined, MenuFoldOutlined, MenuUnfoldOutlined, CheckOutlined } from "@ant-design/icons";
 import { useNavigate, useParams } from "react-router";
 
@@ -151,6 +151,7 @@ export default function LabelStudioTextEditor() {
   } | null>(null);
   const exportCheckSeqRef = useRef(0);
   const savedSnapshotsRef = useRef<Record<string, string>>({});
+  const pendingAutoAdvanceRef = useRef(false);
 
   const [loadingProject, setLoadingProject] = useState(true);
   const [loadingTasks, setLoadingTasks] = useState(false);
@@ -208,9 +209,12 @@ export default function LabelStudioTextEditor() {
       const content = resp?.data?.content || [];
       const items = Array.isArray(content) ? content : [];
       setTasks(items);
-      if (items.length > 0) {
+      const defaultFileId =
-        setSelectedFileId((prev) => prev || (items[0]?.fileId ?? ""));
+        items.find((item) => !item.hasAnnotation)?.fileId || items[0]?.fileId || "";
-      }
+      setSelectedFileId((prev) => {
+        if (prev && items.some((item) => item.fileId === prev)) return prev;
+        return defaultFileId;
+      });
     } catch (e) {
       console.error(e);
       if (!silent) message.error("获取文件列表失败");
@@ -318,7 +322,46 @@ export default function LabelStudioTextEditor() {
     }
   }, [iframeReady, message, postToIframe, project, projectId]);
 
-  const saveFromExport = useCallback(async (payload?: ExportPayload | null) => {
+  const advanceAfterSave = useCallback(async (fileId: string, segmentIndex?: number) => {
+    if (!fileId) return;
+    if (segmented && segments.length > 0) {
+      const sortedSegmentIndices = segments
+        .map((seg) => seg.idx)
+        .sort((a, b) => a - b);
+      const baseIndex = segmentIndex ?? currentSegmentIndex;
+      const currentPos = sortedSegmentIndices.indexOf(baseIndex);
+      const nextSegmentIndex =
+        currentPos >= 0 ? sortedSegmentIndices[currentPos + 1] : sortedSegmentIndices[0];
+      if (nextSegmentIndex !== undefined) {
+        await initEditorForFile(fileId, nextSegmentIndex);
+        return;
+      }
+    }
+
+    if (tasks.length === 0) {
+      message.info("暂无可跳转的数据");
+      return;
+    }
+    const currentFileIndex = tasks.findIndex((item) => item.fileId === fileId);
+    const nextTask = currentFileIndex >= 0 ? tasks[currentFileIndex + 1] : tasks[0];
+    if (nextTask?.fileId) {
+      setSelectedFileId(nextTask.fileId);
+      return;
+    }
+    message.info("已是最后一个数据");
+  }, [
+    currentSegmentIndex,
+    initEditorForFile,
+    message,
+    segmented,
+    segments,
+    tasks,
+  ]);
+
+  const saveFromExport = useCallback(async (
+    payload?: ExportPayload | null,
+    options?: { autoAdvance?: boolean }
+  ) => {
     const payloadTaskId = payload?.taskId;
     if (expectedTaskIdRef.current && payloadTaskId) {
       if (Number(payloadTaskId) !== expectedTaskIdRef.current) {
@@ -363,6 +406,9 @@ export default function LabelStudioTextEditor() {
           )
         );
       }
+      if (options?.autoAdvance) {
+        await advanceAfterSave(String(fileId), segmentIndex);
+      }
       return true;
     } catch (e) {
       console.error(e);
@@ -372,6 +418,7 @@ export default function LabelStudioTextEditor() {
       setSaving(false);
     }
   }, [
+    advanceAfterSave,
     currentSegmentIndex,
     loadTasks,
     message,
@@ -442,11 +489,12 @@ export default function LabelStudioTextEditor() {
       message.warning("请先选择文件");
       return;
     }
+    pendingAutoAdvanceRef.current = true;
     postToIframe("LS_EXPORT", {});
   };
 
   // 段落切换处理
-  const handleSegmentChange = async (newIndex: number) => {
+  const handleSegmentChange = useCallback(async (newIndex: number) => {
     if (newIndex === currentSegmentIndex) return;
     if (segmentSwitching || saving || loadingTaskDetail) return;
     if (!iframeReady || !lsReady) {
@@ -504,7 +552,22 @@ export default function LabelStudioTextEditor() {
     } finally {
       setSegmentSwitching(false);
     }
-  };
+  }, [
+    autoSaveOnSwitch,
+    confirmSaveBeforeSwitch,
+    currentSegmentIndex,
+    iframeReady,
+    initEditorForFile,
+    loadingTaskDetail,
+    lsReady,
+    message,
+    requestExportForCheck,
+    saveFromExport,
+    segmented,
+    selectedFileId,
+    segmentSwitching,
+    saving,
+  ]);
 
   useEffect(() => {
     setIframeReady(false);
@@ -537,6 +600,51 @@ export default function LabelStudioTextEditor() {
     initEditorForFile(selectedFileId);
   }, [selectedFileId, iframeReady, initEditorForFile]);
 
+  const segmentTreeData = useMemo(() => {
+    if (!segmented || segments.length === 0) return [];
+    const lineMap = new Map<number, SegmentInfo[]>();
+    segments.forEach((seg) => {
+      const list = lineMap.get(seg.lineIndex) || [];
+      list.push(seg);
+      lineMap.set(seg.lineIndex, list);
+    });
+    return Array.from(lineMap.entries())
+      .sort((a, b) => a[0] - b[0])
+      .map(([lineIndex, lineSegments]) => ({
+        key: `line-${lineIndex}`,
+        title: `第${lineIndex + 1}行`,
+        selectable: false,
+        children: lineSegments
+          .sort((a, b) => a.chunkIndex - b.chunkIndex)
+          .map((seg) => ({
+            key: `seg-${seg.idx}`,
+            title: (
+              <span className="flex items-center gap-1">
+                <span>{`片${seg.chunkIndex + 1}`}</span>
+                {seg.hasAnnotation && (
+                  <CheckOutlined style={{ fontSize: 10, color: "#52c41a" }} />
+                )}
+              </span>
+            ),
+          })),
+      }));
+  }, [segmented, segments]);
+
+  const segmentLineKeys = useMemo(
+    () => segmentTreeData.map((item) => String(item.key)),
+    [segmentTreeData]
+  );
+
+  const handleSegmentSelect = useCallback((keys: Array<string | number>) => {
+    const [first] = keys;
+    if (first === undefined || first === null) return;
+    const key = String(first);
+    if (!key.startsWith("seg-")) return;
+    const nextIndex = Number(key.replace("seg-", ""));
+    if (!Number.isFinite(nextIndex)) return;
+    handleSegmentChange(nextIndex);
+  }, [handleSegmentChange]);
+
   useEffect(() => {
     const handler = (event: MessageEvent<LsfMessage>) => {
       if (event.origin !== origin) return;
@@ -560,7 +668,9 @@ export default function LabelStudioTextEditor() {
       }
 
       if (msg.type === "LS_EXPORT_RESULT") {
-        saveFromExport(payload);
+        const shouldAutoAdvance = pendingAutoAdvanceRef.current;
+        pendingAutoAdvanceRef.current = false;
+        saveFromExport(payload, { autoAdvance: shouldAutoAdvance });
         return;
       }
 
@@ -579,7 +689,7 @@ export default function LabelStudioTextEditor() {
 
       // 兼容 iframe 内部在 submit 时直接上报（若启用）
       if (msg.type === "LS_SUBMIT") {
-        saveFromExport(payload);
+        saveFromExport(payload, { autoAdvance: false });
         return;
       }
 
@@ -587,6 +697,7 @@ export default function LabelStudioTextEditor() {
         const payloadMessage = resolvePayloadMessage(msg.payload);
         message.error(payloadMessage || "编辑器发生错误");
         setLsReady(false);
+        pendingAutoAdvanceRef.current = false;
       }
     };
 
@@ -668,13 +779,13 @@ export default function LabelStudioTextEditor() {
       <div className="flex flex-1 min-h-0">
         {/* 左侧文件列表 - 可折叠 */}
         <div
-          className="border-r border-gray-200 bg-gray-50 flex flex-col transition-all duration-200"
+          className="border-r border-gray-200 bg-gray-50 flex flex-col transition-all duration-200 min-h-0"
           style={{ width: sidebarCollapsed ? 0 : 240, overflow: "hidden" }}
         >
           <div className="px-3 py-2 border-b border-gray-200 bg-white font-medium text-sm">
             文件列表
           </div>
-          <div className="flex-1 overflow-auto">
+          <div className="flex-1 min-h-0 overflow-auto">
             <List
               loading={loadingTasks}
               size="small"
@@ -712,38 +823,39 @@ export default function LabelStudioTextEditor() {
               )}
             />
           </div>
+          {segmented && (
+            <div className="border-t border-gray-200 bg-white flex flex-col min-h-0">
+              <div className="px-3 py-2 border-b border-gray-200 bg-gray-50 font-medium text-sm flex items-center justify-between">
+                <span>段落/分段</span>
+                <Tag color="blue" style={{ margin: 0 }}>
+                  {currentSegmentIndex + 1} / {segments.length}
+                </Tag>
+              </div>
+              <div className="flex-1 min-h-0 overflow-auto px-2 py-2">
+                {segments.length > 0 ? (
+                  <Tree
+                    showLine
+                    blockNode
+                    selectedKeys={
+                      segmented ? [`seg-${currentSegmentIndex}`] : []
+                    }
+                    expandedKeys={segmentLineKeys}
+                    onSelect={handleSegmentSelect}
+                    treeData={segmentTreeData}
+                  />
+                ) : (
+                  <div className="py-6">
+                    <Empty
+                      image={Empty.PRESENTED_IMAGE_SIMPLE}
+                      description="暂无分段"
+                    />
                   </div>
-
-        {/* 右侧编辑器 - Label Studio iframe */}
-        <div className="flex-1 flex flex-col min-h-0">
-          {/* 段落导航栏 */}
-          {segmented && segments.length > 0 && (
-            <div className="flex flex-nowrap items-center gap-2 px-3 py-2 bg-gray-50 border-b border-gray-200">
-              <Typography.Text style={{ fontSize: 12 }} className="shrink-0">
-                段落：
-              </Typography.Text>
-              <div className="flex-1 min-w-0">
-                <div className="flex gap-1 overflow-x-auto whitespace-nowrap">
-                {segments.map((seg) => (
-                  <Button
-                    key={seg.idx}
-                    size="small"
-                    type={seg.idx === currentSegmentIndex ? "primary" : "default"}
-                    onClick={() => handleSegmentChange(seg.idx)}
-                    disabled={segmentSwitching || saving || loadingTaskDetail || !lsReady}
-                    style={{ minWidth: 64, padding: "0 6px" }}
-                  >
-                    {`行${seg.lineIndex + 1}/片${seg.chunkIndex + 1}`}
-                    {seg.hasAnnotation && (
-                      <CheckOutlined style={{ marginLeft: 2, fontSize: 10 }} />
                 )}
-                  </Button>
-                ))}
               </div>
-              </div>
+              <div className="px-3 py-2 border-t border-gray-200 flex items-center justify-between">
-              <div className="flex items-center gap-2 ml-auto shrink-0 whitespace-nowrap">
+                <Typography.Text style={{ fontSize: 12 }}>
-                <Tag color="blue">{currentSegmentIndex + 1} / {segments.length}</Tag>
+                  切段自动保存
-                <Typography.Text style={{ fontSize: 12 }}>切段自动保存</Typography.Text>
+                </Typography.Text>
                 <Switch
                   size="small"
                   checked={autoSaveOnSwitch}
@@ -753,7 +865,10 @@ export default function LabelStudioTextEditor() {
               </div>
             </div>
           )}
+        </div>
 
+        {/* 右侧编辑器 - Label Studio iframe */}
+        <div className="flex-1 flex flex-col min-h-0">
           {/* 编辑器区域 */}
           <div className="flex-1 relative">
             {(!iframeReady || loadingTaskDetail || (selectedFileId && !lsReady)) && (