feat: complete legacy UI and playout parity migration

tests/MBN_STOCK_WEBVIEW.LegacyWeb.Tests/LegacySceneActionClickParityTests.cs

@@ -0,0 +1,78 @@
+using System.Text.RegularExpressions;
+
+namespace MBN_STOCK_WEBVIEW.LegacyWeb.Tests;
+
+public sealed class LegacySceneActionClickParityTests
+{
+    private static readonly string App = File.ReadAllText(Path.Combine(
+        FindRepositoryRoot(),
+        "src",
+        "MBN_STOCK_WEBVIEW.LegacyParityApp",
+        "Web",
+        "app.js"));
+
+    [Fact]
+    public void ThemeExpertAndTradingHaltActions_AreSingleClickOnly()
+    {
+        // Original evidence: UC4.Designer.cs btn1..btn4, UC6.Designer.cs
+        // btlistadd, and UC7.Designer.cs btn1/btn2 are wired to Click.
+        var doubleClickDelegate = ExtractDelegate("dblclick", "click");
+        var clickDelegate = ExtractDelegate("click", "change");
+
+        foreach (var intent in new[]
+                 {
+                     "activate-theme-action",
+                     "activate-expert-action",
+                     "activate-trading-halt-action"
+                 })
+        {
+            Assert.Contains($"send(\"{intent}\"", clickDelegate, StringComparison.Ordinal);
+            Assert.DoesNotContain($"send(\"{intent}\"", doubleClickDelegate,
+                StringComparison.Ordinal);
+            Assert.Single(Regex.Matches(App, Regex.Escape($"send(\"{intent}\"")).Cast<Match>());
+        }
+    }
+
+    [Fact]
+    public void ExistingSelectionAndTrueDoubleClickBehavior_RemainsSeparated()
+    {
+        var doubleClickDelegate = ExtractDelegate("dblclick", "click");
+        var clickDelegate = ExtractDelegate("click", "change");
+
+        Assert.Contains("send(\"double-click-industry\"", doubleClickDelegate,
+            StringComparison.Ordinal);
+        Assert.Contains("send(\"activate-comparison-action\"", doubleClickDelegate,
+            StringComparison.Ordinal);
+        Assert.Contains("send(\"select-theme\"", clickDelegate, StringComparison.Ordinal);
+        Assert.Contains("send(\"select-expert\"", clickDelegate, StringComparison.Ordinal);
+        Assert.Contains("send(\"select-trading-halt\"", clickDelegate,
+            StringComparison.Ordinal);
+    }
+
+    private static string ExtractDelegate(string eventName, string nextEventName)
+    {
+        var startToken = $"categoryTree.addEventListener(\"{eventName}\"";
+        var endToken = $"categoryTree.addEventListener(\"{nextEventName}\"";
+        var start = App.IndexOf(startToken, StringComparison.Ordinal);
+        var end = App.IndexOf(endToken, start + startToken.Length, StringComparison.Ordinal);
+        Assert.True(start >= 0 && end > start);
+        return App[start..end];
+    }
+
+    private static string FindRepositoryRoot()
+    {
+        var current = new DirectoryInfo(AppContext.BaseDirectory);
+        while (current is not null)
+        {
+            if (Directory.Exists(Path.Combine(current.FullName, "src")) &&
+                Directory.Exists(Path.Combine(current.FullName, "tests")))
+            {
+                return current.FullName;
+            }
+
+            current = current.Parent;
+        }
+
+        throw new DirectoryNotFoundException("Repository root was not found.");
+    }
+}