feat: complete legacy parity and modernize operator UI

tests/MBN_STOCK_WEBVIEW.LegacyBridge.Tests/LegacyRowDoubleClickBridgeTests.cs

@@ -50,6 +50,51 @@ public sealed class LegacyRowDoubleClickBridgeTests
             out _));
     }
 
+    [Theory]
+    [InlineData(true)]
+    [InlineData(false)]
+    public void Named_playlist_save_carries_only_the_success_dialog_choice(bool showSavedAlert)
+    {
+        var json = JsonSerializer.Serialize(new
+        {
+            type = "save-current-named-playlist-to",
+            payload = new
+            {
+                definitionId = "named-definition-AAAAAAAAAAAB",
+                showSavedAlert
+            }
+        });
+
+        Assert.True(LegacyBridgeProtocol.TryParseIntent(json, out var parsed, out _));
+        var save = Assert.IsType<LegacySaveCurrentNamedPlaylistToIntent>(parsed);
+        Assert.Equal(showSavedAlert, save.ShowSavedAlert);
+
+        Assert.False(LegacyBridgeProtocol.TryParseIntent(
+            "{\"type\":\"save-current-named-playlist-to\",\"payload\":{" +
+            "\"definitionId\":\"named-definition-AAAAAAAAAAAB\"," +
+            "\"showSavedAlert\":\"yes\"}}",
+            out _,
+            out _));
+    }
+
+    [Fact]
+    public void Named_playlist_load_rejects_save_dialog_metadata()
+    {
+        Assert.True(LegacyBridgeProtocol.TryParseIntent(
+            "{\"type\":\"load-named-playlist-by-id\",\"payload\":{" +
+            "\"definitionId\":\"named-definition-AAAAAAAAAAEF\"}}",
+            out var parsed,
+            out _));
+        Assert.IsType<LegacyLoadNamedPlaylistByIdIntent>(parsed);
+
+        Assert.False(LegacyBridgeProtocol.TryParseIntent(
+            "{\"type\":\"load-named-playlist-by-id\",\"payload\":{" +
+            "\"definitionId\":\"named-definition-AAAAAAAAAAEF\"," +
+            "\"showSavedAlert\":false}}",
+            out _,
+            out _));
+    }
+
     [Fact]
     public void Projection_exposes_only_closed_command_receipt_and_opaque_target()
     {