feat: restore legacy modal and drag behavior

tests/MBN_STOCK_WEBVIEW.LegacyWeb.Tests/LegacyNamedPlaylistDispatchFailureContractTests.cs

@@ -0,0 +1,100 @@
+namespace MBN_STOCK_WEBVIEW.LegacyWeb.Tests;
+
+public sealed class LegacyNamedPlaylistDispatchFailureContractTests
+{
+    private static readonly string RepositoryRoot = FindRepositoryRoot();
+    private static readonly string MainWindow = File.ReadAllText(Path.Combine(
+        RepositoryRoot,
+        "src",
+        "MBN_STOCK_WEBVIEW.LegacyParityApp",
+        "MainWindow.xaml.cs"));
+
+    [Fact]
+    public void NativeRejectionsAndUnexpectedExceptionsTerminateCorrelatedCommands()
+    {
+        Assert.Contains(
+            "PostState(IsNamedPlaylistModalIntent(intent)",
+            MainWindow,
+            StringComparison.Ordinal);
+        Assert.Contains(
+            "var failureState = ReportIntentFailure(",
+            MainWindow,
+            StringComparison.Ordinal);
+        Assert.Contains(
+            "ObserveOperatorMutationQuarantine(failureState);",
+            MainWindow,
+            StringComparison.Ordinal);
+        Assert.Contains(
+            "writeOutcomeMayBeUnknown: dispatchStarted",
+            MainWindow,
+            StringComparison.Ordinal);
+        Assert.Contains(
+            "_controller.ReportNamedPlaylistWriteOutcomeUnknown(",
+            MainWindow,
+            StringComparison.Ordinal);
+        Assert.Contains("RefreshNamedPlaylistsForDispatchAsync(", MainWindow,
+            StringComparison.Ordinal);
+        Assert.Contains("SelectNamedPlaylistForDispatch(", MainWindow,
+            StringComparison.Ordinal);
+        Assert.Contains("CreateNamedPlaylistForDispatchAsync(", MainWindow,
+            StringComparison.Ordinal);
+        Assert.Contains("DeleteNamedPlaylistForDispatchAsync(", MainWindow,
+            StringComparison.Ordinal);
+        Assert.Contains("_controller.CompleteNamedPlaylistDispatch(", MainWindow,
+            StringComparison.Ordinal);
+        Assert.Contains(
+            "_controller.ReportNamedPlaylistCommandFailure(\n" +
+            "                    \"load-named-playlist-by-id\"",
+            MainWindow.Replace("\r\n", "\n", StringComparison.Ordinal),
+            StringComparison.Ordinal);
+        Assert.Contains(
+            "_controller.ReportNamedPlaylistCommandFailure(\n" +
+            "                    \"save-current-named-playlist-to\"",
+            MainWindow.Replace("\r\n", "\n", StringComparison.Ordinal),
+            StringComparison.Ordinal);
+    }
+
+    [Fact]
+    public void SelectionUsesAnExactReceiptWithoutDisablingTheSecondDoubleClick()
+    {
+        var normalized = MainWindow.Replace("\r\n", "\n", StringComparison.Ordinal);
+
+        Assert.Contains(
+            "LegacySelectNamedPlaylistIntent selection =>\n" +
+            "                SelectNamedPlaylistForDispatch(",
+            normalized,
+            StringComparison.Ordinal);
+        Assert.Contains(
+            "intent is LegacyRefreshNamedPlaylistsIntent or\n" +
+            "            LegacySelectNamedPlaylistIntent or",
+            normalized,
+            StringComparison.Ordinal);
+        Assert.DoesNotContain(
+            "LegacyRefreshNamedPlaylistsIntent or\n" +
+            "                    LegacySelectNamedPlaylistIntent or",
+            normalized,
+            StringComparison.Ordinal);
+        Assert.Contains(
+            "\"select-named-playlist\",\n" +
+            "            requestId,\n" +
+            "            succeeded",
+            normalized,
+            StringComparison.Ordinal);
+    }
+
+    private static string FindRepositoryRoot()
+    {
+        var current = new DirectoryInfo(AppContext.BaseDirectory);
+        while (current is not null)
+        {
+            if (File.Exists(Path.Combine(current.FullName, "MBN_STOCK_WEBVIEW.sln")))
+            {
+                return current.FullName;
+            }
+
+            current = current.Parent;
+        }
+
+        throw new DirectoryNotFoundException("Repository root was not found.");
+    }
+}