feat: refine branded operator experience

Add the MBN-branded startup intro, semantic sidebar icons, and refined card-based operator visuals. Strengthen packaged UI and input smoke coverage for the updated experience.

tests/MBN_STOCK_WEBVIEW.LegacyWeb.Tests/LegacyPackageInputSmokeContractTests.cs

@@ -834,6 +834,11 @@ public sealed class LegacyPackageInputSmokeContractTests
             "delete-selected-playlist-rows",
             "selections[1].shift !== true",
             "shiftRangeDeletedRowIds = [rangeStartRowId, rangeEndRowId]");
+        Assert.Contains("neutral-pointer guard", request, StringComparison.Ordinal);
+        Assert.Contains("await moveMouse(neutralPoint)", request,
+            StringComparison.Ordinal);
+        Assert.Contains("neutralSignature !== guardSignature", request,
+            StringComparison.Ordinal);
         Assert.DoesNotContain("Input.dispatchMouseEvent", request,
             StringComparison.Ordinal);
 
@@ -934,6 +939,39 @@ public sealed class LegacyPackageInputSmokeContractTests
             StringComparison.Ordinal);
     }
 
+    [Fact]
+    public void StartupIntroMustBeDismissedBeforeThePhysicalInputHarnessStarts()
+    {
+        var wait = Slice(
+            Runner,
+            "function Wait-StartupIntroDismissed",
+            "function Assert-NoExistingContentDialog");
+        Assert.Contains("[datetime]::UtcNow.AddSeconds(4)", wait,
+            StringComparison.Ordinal);
+        Assert.Contains("매일경제TV V-STOCK 시작 화면", wait,
+            StringComparison.Ordinal);
+        Assert.Contains("[Windows.Automation.PropertyCondition]::new(", wait,
+            StringComparison.Ordinal);
+        Assert.Contains("$intro.Current.IsOffscreen", wait,
+            StringComparison.Ordinal);
+        Assert.Contains("Assert-ExactApplicationStillRunning", wait,
+            StringComparison.Ordinal);
+        Assert.Contains("Assert-NoTornadoConnection", wait,
+            StringComparison.Ordinal);
+        Assert.Contains("remained visible beyond its four-second bound", wait,
+            StringComparison.Ordinal);
+
+        var launch = Slice(
+            Runner,
+            "$script:Phase = 'package launch'",
+            "$harnessRun = Invoke-NodeHarnessUnderTcpWatch");
+        AssertInOrder(
+            launch,
+            "Wait-ExactLoopbackListener",
+            "Wait-StartupIntroDismissed",
+            "$script:Phase = 'real input harness'");
+    }
+
     [Fact]
     public void DebugAppXMustMatchTheLatestMsixAndCurrentWebSourceBeforeLaunch()
     {
@@ -946,7 +984,10 @@ public sealed class LegacyPackageInputSmokeContractTests
             StringComparison.Ordinal);
         Assert.Contains("[IO.Compression.ZipFile]::OpenRead($msix)", guard,
             StringComparison.Ordinal);
+        Assert.Contains("'AppxManifest.xml'", guard, StringComparison.Ordinal);
+        Assert.Contains("'Assets/StartupHero.png'", guard, StringComparison.Ordinal);
         Assert.Contains("'Web/app.js'", guard, StringComparison.Ordinal);
+        Assert.Contains("'Web/Brand/logo.png'", guard, StringComparison.Ordinal);
         Assert.Contains("'Web/index.html'", guard, StringComparison.Ordinal);
         Assert.Contains("'Web/playout-ui.js'", guard, StringComparison.Ordinal);
         Assert.Contains("'Web/styles.css'", guard, StringComparison.Ordinal);
@@ -956,7 +997,20 @@ public sealed class LegacyPackageInputSmokeContractTests
             StringComparison.Ordinal);
         Assert.Contains("registered Debug AppX is stale", guard,
             StringComparison.Ordinal);
-        Assert.Contains("Web\\app.js", guard, StringComparison.Ordinal);
+        foreach (var relativeSource in new[]
+                 {
+                     "Web\\app.js",
+                     "Web\\index.html",
+                     "Web\\styles.css",
+                     "Web\\workspace-navigation.js"
+                 })
+        {
+            Assert.Contains(relativeSource, guard, StringComparison.Ordinal);
+        }
+        Assert.Contains("$sourcePath = Join-Path $projectRoot $relativeSource", guard,
+            StringComparison.Ordinal);
+        Assert.Contains("$installedPath = Join-Path $InstallLocation $relativeSource", guard,
+            StringComparison.Ordinal);
         Assert.Contains(
             "Assert-DebugAppXMatchesLatestPackage ([string]$package.InstallLocation)",
             Runner,