feat(annotation): 添加保存快捷键功能

- 实现了 Ctrl+S 保存快捷键检测逻辑
- 添加了 handleSaveShortcut 事件处理函数
- 在窗口上注册键盘事件监听器
- 修改 requestExport 函数支持 autoAdvance 参数
- 更新保存按钮点击事件传递 autoAdvance 参数

frontend/public/lsf/lsf.html

@@ -268,6 +268,17 @@
           return true;
         }
 
+        function isSaveShortcut(event) {
+          if (!event || event.defaultPrevented || event.isComposing) return false;
+          const key = event.key;
+          const code = event.code;
+          const isS = key === "s" || key === "S" || code === "KeyS";
+          if (!isS) return false;
+          if (!(event.ctrlKey || event.metaKey)) return false;
+          if (event.shiftKey || event.altKey) return false;
+          return true;
+        }
+
         function handleSaveAndNextShortcut(event) {
           if (!isSaveAndNextShortcut(event) || event.repeat) return;
           event.preventDefault();
@@ -280,6 +291,18 @@
           }
         }
 
+        function handleSaveShortcut(event) {
+          if (!isSaveShortcut(event) || event.repeat) return;
+          event.preventDefault();
+          event.stopPropagation();
+          try {
+            const raw = exportSelectedAnnotation();
+            postToParent("LS_EXPORT_RESULT", raw);
+          } catch (e) {
+            postToParent("LS_ERROR", { message: e?.message || String(e) });
+          }
+        }
+
         function initLabelStudio(payload) {
           if (!window.LabelStudio) {
             throw new Error("LabelStudio 未加载（请检查静态资源/网络）");
@@ -351,6 +374,7 @@
         }
 
         window.addEventListener("keydown", handleSaveAndNextShortcut);
+        window.addEventListener("keydown", handleSaveShortcut);
 
         window.addEventListener("message", (event) => {
           if (event.origin !== ORIGIN) return;

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

@@ -117,6 +117,17 @@ const resolveSegmentIndex = (value: unknown) => {
   return Number.isFinite(parsed) ? parsed : undefined;
 };
 
+const isSaveShortcut = (event: KeyboardEvent) => {
+  if (event.defaultPrevented || event.isComposing) return false;
+  const key = event.key;
+  const code = event.code;
+  const isS = key === "s" || key === "S" || code === "KeyS";
+  if (!isS) return false;
+  if (!(event.ctrlKey || event.metaKey)) return false;
+  if (event.shiftKey || event.altKey) return false;
+  return true;
+};
+
 const normalizePayload = (payload: unknown): ExportPayload | undefined => {
   if (!payload || typeof payload !== "object") return undefined;
   return payload as ExportPayload;
@@ -851,14 +862,27 @@ export default function LabelStudioTextEditor() {
     });
   }, [modal]);
 
-  const requestExport = () => {
+  const requestExport = useCallback((autoAdvance: boolean) => {
     if (!selectedFileId) {
       message.warning("请先选择文件");
       return;
     }
-    pendingAutoAdvanceRef.current = true;
+    pendingAutoAdvanceRef.current = autoAdvance;
     postToIframe("LS_EXPORT", {});
-  };
+  }, [message, postToIframe, selectedFileId]);
+
+  useEffect(() => {
+    const handleSaveShortcut = (event: KeyboardEvent) => {
+      if (!isSaveShortcut(event) || event.repeat) return;
+      if (saving || loadingTaskDetail || segmentSwitching) return;
+      if (!iframeReady || !lsReady) return;
+      event.preventDefault();
+      event.stopPropagation();
+      requestExport(false);
+    };
+    window.addEventListener("keydown", handleSaveShortcut);
+    return () => window.removeEventListener("keydown", handleSaveShortcut);
+  }, [iframeReady, loadingTaskDetail, lsReady, requestExport, saving, segmentSwitching]);
 
   // 段落切换处理
   const handleSegmentChange = useCallback(async (newIndex: number) => {
@@ -1212,7 +1236,7 @@ export default function LabelStudioTextEditor() {
             icon={<SaveOutlined />}
             loading={saving}
             disabled={!iframeReady || !selectedFileId}
-            onClick={requestExport}
+            onClick={() => requestExport(true)}
           >
             保存
           </Button>