feat(ads/seo/release): v1.2.0 with live Google Ads, isolated ad profile, ads.txt, and SEO/AEO/GEO optimization

tests/Paca.Tests/App/DesktopZenRailAndStatusBarGateTests.cs

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+using System.IO;
+using Paca.Browser.Layouts;
+using Paca.Browser.Panels;
+using Paca.Browser.Theming;
+using Xunit;
+
+namespace Paca.Tests.App;
+
+public class DesktopZenRailAndStatusBarGateTests
+{
+    private readonly string _mainWindowXamlPath;
+
+    public DesktopZenRailAndStatusBarGateTests()
+    {
+        var baseDir = AppContext.BaseDirectory;
+        var solutionDir = Path.GetFullPath(Path.Combine(baseDir, "..", "..", "..", "..", ".."));
+        _mainWindowXamlPath = Path.Combine(solutionDir, "src", "Paca.App", "MainWindow.xaml");
+    }
+
+    [Fact]
+    public void Gate_ZenSideRail_XamlStructure_ContainsExtendedMultitaskingIcons()
+    {
+        Assert.True(File.Exists(_mainWindowXamlPath), "MainWindow.xaml 파일이 존재해야 합니다.");
+        var xaml = File.ReadAllText(_mainWindowXamlPath);
+
+        // ZenSideRail 세로 독 확장 아이콘 검증
+        Assert.Contains("x:Name=\"SideTabWebPanel\"", xaml);
+        Assert.Contains("x:Name=\"SideTabTaskManager\"", xaml);
+
+        // 56px 축소 레일의 퀵 액션 단추 검증
+        Assert.Contains("x:Name=\"CollapsedRailWebPanel\"", xaml);
+        Assert.Contains("x:Name=\"CollapsedRailTaskManager\"", xaml);
+    }
+
+    [Fact]
+    public void Gate_StatusBar_XamlStructure_ContainsZoomAndHostModules()
+    {
+        Assert.True(File.Exists(_mainWindowXamlPath), "MainWindow.xaml 파일이 존재해야 합니다.");
+        var xaml = File.ReadAllText(_mainWindowXamlPath);
+
+        // 하단 상태바 인체공학 모듈 검증
+        Assert.Contains("x:Name=\"StatusHostBadge\"", xaml);
+        Assert.Contains("x:Name=\"StatusZoomSlider\"", xaml);
+    }
+
+    [Theory]
+    [InlineData("tab0", -120, "tab1")]  // 아래로 휠 스크롤 -> 다음 탭 (tab0 -> tab1)
+    [InlineData("tab4", -120, "tab0")]  // 끝에서 아래로 스크롤 -> 첫 탭 래핑 (tab4 -> tab0)
+    [InlineData("tab0", 120, "tab4")]   // 첫 탭에서 위로 스크롤 -> 끝 탭 래핑 (tab0 -> tab4)
+    [InlineData("tab2", 120, "tab1")]   // 위로 휠 스크롤 -> 이전 탭 (tab2 -> tab1)
+    public void Gate_TabStripScrollSwitcher_CyclesThroughTabsOnWheel(string current, int delta, string expected)
+    {
+        var switcher = new TabStripScrollSwitcher
+        {
+            CycleMode = ScrollCycleMode.WrapAround,
+            InvertScrollDirection = true // wheel down (-120) moves forward
+        };
+        switcher.SetTabs(new[] { "tab0", "tab1", "tab2", "tab3", "tab4" }, current);
+        var next = switcher.OnScrollWheel(delta);
+        Assert.Equal(expected, next);
+    }
+
+    [Fact]
+    public void Gate_SidebarPanelManager_RegistersWebPanels()
+    {
+        var manager = new SidebarPanelManager();
+        var panels = manager.GetAllPanels();
+
+        Assert.NotEmpty(panels);
+        Assert.Contains(panels, p => p.Title.Contains("번역") || p.Title.Contains("Translate") || p.Id == "papago");
+    }
+}