fix bug

sentence_api/static/admin.js

@@ -188,7 +188,7 @@ async function openSentences(video) {
     for (const sentence of sentences) {
       elements.sentenceRows.append(sentenceRow(video, sentence));
     }
-    elements.dialog.showModal();
+    if (!elements.dialog.open) elements.dialog.showModal();
   } catch (error) {
     elements.serviceState.textContent = `句子加载失败: ${error.message}`;
   }
@@ -232,6 +232,7 @@ function sentenceRow(video, sentence) {
         save.textContent = "已保存";
       }
     } catch (error) {
+      elements.serviceState.textContent = `句子保存失败: ${error.message}`;
       save.textContent = error.message;
     } finally {
       window.setTimeout(() => { save.disabled = false; save.textContent = "保存"; }, 1600);