fix: preserve search input and add choseong lookup

tests/MBN_STOCK_WEBVIEW.LegacyWeb.Tests/LegacyFixedSectionBatchWebTests.cs

@@ -44,7 +44,9 @@ public sealed class LegacyFixedSectionBatchWebTests
         Assert.Contains("const fixedBatch = state.fixedSectionBatch", manual,
             StringComparison.Ordinal);
         Assert.Contains("아직 편성표에 추가되지 않았습니다", manual, StringComparison.Ordinal);
-        Assert.Contains("button.disabled = busy || fixedBatch != null", manual,
+        Assert.Contains("button.disabled = fixedBatch != null", manual,
+            StringComparison.Ordinal);
+        Assert.Contains("setTransientControlsBusy(manualListDialog, state.isBusy === true)", manual,
             StringComparison.Ordinal);
         Assert.Contains("확인 후 다음", manual, StringComparison.Ordinal);
         Assert.Contains("확인 후 섹션 추가", manual, StringComparison.Ordinal);