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/QuickActionAdvancedUxAndLocalizationGateTests.cs

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+using System;
+using System.IO;
+using System.Linq;
+using Paca.Core.QuickActions;
+using Xunit;
+
+namespace Paca.Tests.App;
+
+public class QuickActionAdvancedUxAndLocalizationGateTests
+{
+    private static readonly string SolutionRoot = Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, "..", "..", "..", "..", ".."));
+    private readonly string _xamlPath;
+    private readonly string _csPath;
+
+    public QuickActionAdvancedUxAndLocalizationGateTests()
+    {
+        _xamlPath = Path.Combine(SolutionRoot, "src", "Paca.App", "QuickActionLauncherWindow.xaml");
+        _csPath = Path.Combine(SolutionRoot, "src", "Paca.App", "QuickActionLauncherWindow.xaml.cs");
+    }
+
+    [Fact]
+    public void Gate_QuickAction_CrossLanguageSearch_SupportsKoreanEnglishJapanese()
+    {
+        var catalog = new QuickActionCatalog();
+        var searchEngine = new QuickActionSearchEngine(catalog);
+
+        // Korean search
+        var koResults = searchEngine.Search("새 탭");
+        Assert.NotEmpty(koResults);
+        Assert.Equal("browser.new_tab", koResults[0].Action.Id);
+
+        // English search
+        var enResults = searchEngine.Search("new tab");
+        Assert.NotEmpty(enResults);
+        Assert.Equal("browser.new_tab", enResults[0].Action.Id);
+
+        // Screenshot
+        var shotKo = searchEngine.Search("스크린샷");
+        var shotEn = searchEngine.Search("screenshot");
+        Assert.NotEmpty(shotKo);
+        Assert.NotEmpty(shotEn);
+    }
+
+    [Fact]
+    public void Gate_QuickAction_CategoryFilter_FiltersAccurately()
+    {
+        var catalog = new QuickActionCatalog();
+        var searchEngine = new QuickActionSearchEngine(catalog);
+
+        var browserOnly = searchEngine.Search(string.Empty, maxResults: 50, categoryFilter: QuickActionCategory.Browser);
+        Assert.NotEmpty(browserOnly);
+        Assert.All(browserOnly, r => Assert.Equal(QuickActionCategory.Browser, r.Action.Category));
+
+        var devOnly = searchEngine.Search(string.Empty, maxResults: 50, categoryFilter: QuickActionCategory.Developer);
+        Assert.NotEmpty(devOnly);
+        Assert.All(devOnly, r => Assert.Equal(QuickActionCategory.Developer, r.Action.Category));
+    }
+
+    [Fact]
+    public void Gate_QuickAction_AutocompleteSuggestion_ReturnsTopTitle()
+    {
+        var catalog = new QuickActionCatalog();
+        var searchEngine = new QuickActionSearchEngine(catalog);
+
+        string? suggestion = searchEngine.GetTopSuggestion("새");
+        Assert.NotNull(suggestion);
+        Assert.StartsWith("새", suggestion);
+    }
+
+    [Fact]
+    public void Gate_QuickAction_DisplayLocalization_ResultsContainLocalizedStringsForCulture()
+    {
+        var catalog = new QuickActionCatalog();
+        var searchEngine = new QuickActionSearchEngine(catalog);
+
+        // English culture
+        var enResults = searchEngine.Search("new tab", cultureCode: "en-US");
+        Assert.NotEmpty(enResults);
+        Assert.Equal("New Tab", enResults[0].Title);
+        Assert.Equal("Browser", enResults[0].CategoryName);
+
+        // Japanese culture
+        var jaResults = searchEngine.Search("new tab", cultureCode: "ja-JP");
+        Assert.NotEmpty(jaResults);
+        Assert.Contains("タブ", jaResults[0].Title);
+        Assert.Equal("ブラウザ", jaResults[0].CategoryName);
+
+        // Korean culture
+        var koResults = searchEngine.Search("new tab", cultureCode: "ko-KR");
+        Assert.NotEmpty(koResults);
+        Assert.Equal("새 탭 열기", koResults[0].Title);
+        Assert.Equal("브라우저", koResults[0].CategoryName);
+    }
+
+    [Fact]
+    public void Gate_QuickAction_Xaml_UsesStrictDesignTokensAndUnclippedShadow()
+    {
+        Assert.True(File.Exists(_xamlPath));
+        var xaml = File.ReadAllText(_xamlPath);
+
+        // Root font inheritance from SSOT
+        Assert.Contains("FontFamily=\"{DynamicResource UiFont}\"", xaml);
+
+        // Correct token check: CardBgHover must be used, NOT CardHoverBg
+        Assert.DoesNotContain("CardHoverBg", xaml);
+        Assert.Contains("CardBgHover", xaml);
+
+        // Selection token check
+        Assert.Contains("SelectionBrush", xaml);
+
+        // Category chips and autocomplete hint
+        Assert.Contains("CategoryChipBar", xaml);
+        Assert.Contains("AutocompleteHintText", xaml);
+
+        // Unclipped shadow margin
+        Assert.Contains("Margin=\"20\"", xaml);
+    }
+
+    [Fact]
+    public void Gate_QuickAction_CodeBehind_SupportsKeyboardNavigationAndShortcuts()
+    {
+        Assert.True(File.Exists(_csPath));
+        var cs = File.ReadAllText(_csPath);
+
+        // Quick numbers Ctrl+1 ~ Ctrl+9
+        Assert.Contains("ExecuteQuickNumberAction", cs);
+
+        // Golden ratio positioning
+        Assert.Contains("0.28", cs);
+
+        // Autocomplete Tab logic & Right arrow
+        Assert.Contains("Key.Tab", cs);
+        Assert.Contains("Key.Right", cs);
+
+        // SetForegroundWindow for input conflict defense
+        Assert.Contains("SetForegroundWindow", cs);
+
+        // Category prefix triggers
+        Assert.Contains("CheckCategoryPrefixTrigger", cs);
+    }
+}