feat(annotation): 添加保存并跳转快捷键功能

- 实现了 Ctrl+Enter 保存并跳转到下一个标注的快捷键逻辑
- 添加了键盘事件监听器来捕获快捷键组合
- 集成了导出选中标注并发送到父窗口的功能
- 处理了快捷键事件的防重复和传播阻止
- 在消息处理器中添加了 LS_SAVE_AND_NEXT 类型的支持
- 实现了自动跳转到下一项标注的功能

frontend/public/lsf/lsf.html

@@ -226,6 +226,29 @@
           };
         }
 
+        function isSaveAndNextShortcut(event) {
+          if (!event || event.defaultPrevented || event.isComposing) return false;
+          const key = event.key;
+          const code = event.code;
+          const isEnter = key === "Enter" || code === "Enter" || code === "NumpadEnter";
+          if (!isEnter) 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();
+          event.stopPropagation();
+          try {
+            const raw = exportSelectedAnnotation();
+            postToParent("LS_SAVE_AND_NEXT", 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）");
@@ -296,6 +319,8 @@
           });
         }
 
+        window.addEventListener("keydown", handleSaveAndNextShortcut);
+
         window.addEventListener("message", (event) => {
           if (event.origin !== ORIGIN) return;
 

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

@@ -865,6 +865,12 @@ export default function LabelStudioTextEditor() {
         return;
       }
 
+      if (msg.type === "LS_SAVE_AND_NEXT") {
+        pendingAutoAdvanceRef.current = false;
+        saveFromExport(payload, { autoAdvance: true });
+        return;
+      }
+
       if (msg.type === "LS_EXPORT_CHECK_RESULT") {
         const pending = exportCheckRef.current;
         if (!pending) return;