feat: restore legacy modal and drag behavior

src/MBN_STOCK_WEBVIEW.LegacyApplication/LegacyOperatorController.cs

@@ -3374,18 +3374,19 @@ public sealed class LegacyOperatorController
             Touch();
             return CreateSnapshot();
         }
+        var selectedRevision = selected.NamedPlaylist?.Revision ?? -1;
 
         var saved = await SaveCurrentNamedPlaylistAsync(cancellationToken)
             .ConfigureAwait(false);
         var succeeded =
+            (saved.NamedPlaylist?.Revision ?? -1) > selectedRevision &&
             string.Equals(
                 saved.NamedPlaylist?.SelectedDefinitionId,
                 definitionId,
                 StringComparison.Ordinal) &&
             saved.NamedPlaylist?.LastMutationOutcome is
                 LegacyNamedPlaylistMutationOutcome.CommittedFresh or
-                LegacyNamedPlaylistMutationOutcome.CommittedOptimistic &&
-            saved.StatusKind == LegacyOperatorStatusKind.Information;
+                LegacyNamedPlaylistMutationOutcome.CommittedOptimistic;
         CompleteCommand(command, definitionId, succeeded);
         Touch();
         return CreateSnapshot();
@@ -3441,6 +3442,88 @@ public sealed class LegacyOperatorController
         return CreateSnapshot();
     }
 
+    /// <summary>
+    /// Completes a correlated named-playlist command when the native dispatch
+    /// boundary rejects the request or encounters an unexpected exception.
+    /// The terminal receipt prevents the WebView modal from waiting indefinitely;
+    /// the named-playlist workflow remains the authority for any write quarantine
+    /// that was already latched before the exception escaped.
+    /// </summary>
+    public LegacyOperatorSnapshot ReportNamedPlaylistCommandFailure(
+        string command,
+        string targetId,
+        string message)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(command);
+        ArgumentException.ThrowIfNullOrWhiteSpace(targetId);
+        if (command is not "refresh-named-playlists" and
+            not "select-named-playlist" and
+            not "create-named-playlist" and
+            not "delete-selected-named-playlist" and
+            not "load-named-playlist-by-id" and
+            not "save-current-named-playlist-to")
+        {
+            throw new ArgumentOutOfRangeException(
+                nameof(command),
+                command,
+                "Only correlated named-playlist commands can be completed here.");
+        }
+
+        CompleteCommand(command, targetId, succeeded: false);
+        return ReportError(message);
+    }
+
+    public LegacyOperatorSnapshot CompleteNamedPlaylistDispatch(
+        string command,
+        string requestId,
+        bool succeeded)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(command);
+        ArgumentException.ThrowIfNullOrWhiteSpace(requestId);
+        if (command is not "refresh-named-playlists" and
+            not "select-named-playlist" and
+            not "create-named-playlist" and
+            not "delete-selected-named-playlist")
+        {
+            throw new ArgumentOutOfRangeException(
+                nameof(command),
+                command,
+                "The command does not use a named-playlist dispatch id.");
+        }
+
+        CompleteCommand(command, requestId, succeeded);
+        Touch();
+        return CreateSnapshot();
+    }
+
+    /// <summary>
+    /// Terminates an accepted save command without making its database outcome
+    /// retryable. This is intentionally separate from a known pre-dispatch
+    /// rejection: an escaped post-dispatch exception permanently quarantines every
+    /// later named-playlist write in this process.
+    /// </summary>
+    public LegacyOperatorSnapshot ReportNamedPlaylistWriteOutcomeUnknown(
+        string command,
+        string targetId,
+        string message)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(command);
+        ArgumentException.ThrowIfNullOrWhiteSpace(targetId);
+        if (command is not "create-named-playlist" and
+            not "delete-selected-named-playlist" and
+            not "save-current-named-playlist-to")
+        {
+            throw new ArgumentOutOfRangeException(
+                nameof(command),
+                command,
+                "The command is not a named-playlist write.");
+        }
+
+        _namedPlaylistWorkflow?.QuarantineAmbiguousWriteOutcome();
+        CompleteCommand(command, targetId, succeeded: false);
+        return ReportError(message);
+    }
+
     public LegacyOperatorSnapshot ReportInformation(string message)
     {
         _statusMessage = message ?? string.Empty;