feat: complete legacy parity and modernize operator UI

tests/MBN_STOCK_WEBVIEW.LegacyApplication.Tests/LegacyOperatorPlayoutRequestTests.cs

@@ -152,11 +152,11 @@ public sealed class LegacyOperatorPlayoutRequestTests
     [InlineData("1/21")]
     [InlineData("2/1")]
     [InlineData("1 /2")]
-    public void CanonicalPagedGraphicRejectsInvalidOperatorPageText(string pageText)
+    public void CanonicalPagedGraphicDefersHistoricalInvalidPageText(string pageText)
     {
-        var row = OperatorRow("5단 표그래프", pageText);
+        var entry = OperatorRow("5단 표그래프", pageText).ToPlayoutEntry();
 
-        Assert.Throws<InvalidOperationException>(row.ToPlayoutEntry);
+        Assert.Null(entry.PageNavigation);
     }
 
     [Fact]