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

tests/Paca.Tests/Browser/ChromeParityMilestone15Tests.cs

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+using System;
+using System.IO;
+using Paca.App.Browser.Features;
+using Paca.Browser.Tabs;
+using Paca.Tests.Infrastructure;
+using Xunit;
+
+namespace Paca.Tests.Browser;
+
+public class ChromeParityMilestone15Tests
+{
+    [Fact]
+    public void GetAllOrSearch_빈질의일때_모든_열린탭과_최근닫힌탭_즉시_반환()
+    {
+        var m = new TabManager(() => new TabItem());
+        var t1 = m.NewTab("https://github.com");
+        t1.Title = "GitHub";
+        var t2 = m.NewTab("https://google.com");
+        t2.Title = "Google";
+        var t3 = m.NewTab("https://youtube.com");
+        t3.Title = "YouTube";
+
+        // 하나를 닫아 ClosedStack 에 추가
+        m.CloseTab(t3);
+
+        // 빈 질의로 GetAllOrSearch 호출 시 열린 탭 2개 + 닫힌 탭 1개 반환되어야 함 (Chrome Ctrl+Shift+A 기본 동작)
+        var results = TabSearchFilter.GetAllOrSearch(m.Tabs, m.ClosedStack, "");
+        Assert.Equal(3, results.Count);
+
+        Assert.False(results[0].IsClosed);
+        Assert.Equal("GitHub", results[0].Title);
+
+        Assert.False(results[1].IsClosed);
+        Assert.Equal("Google", results[1].Title);
+
+        Assert.True(results[2].IsClosed);
+        Assert.Equal("YouTube", results[2].Title);
+    }
+
+    [Fact]
+    public void GetAllOrSearch_검색어_입력시_부분일치_필터링()
+    {
+        var m = new TabManager(() => new TabItem());
+        var t1 = m.NewTab("https://github.com");
+        t1.Title = "GitHub: Where the world builds";
+        var t2 = m.NewTab("https://google.com");
+        t2.Title = "Google Search";
+
+        var hits = TabSearchFilter.GetAllOrSearch(m.Tabs, m.ClosedStack, "git");
+        Assert.Single(hits);
+        Assert.Equal("GitHub: Where the world builds", hits[0].Title);
+    }
+
+    [Fact]
+    public void MainWindow_ToggleTabSearch_오픈시_즉시_결과_갱신_검증()
+    {
+        var csPath = SourceTree.AppPath("MainWindow.xaml.cs");
+        Assert.True(File.Exists(csPath), "MainWindow.xaml.cs 파일이 존재해야 합니다.");
+        var code = File.ReadAllText(csPath);
+
+        // ToggleTabSearch 및 TextChanged 에서 GetAllOrSearch 가 사용되어야 함
+        Assert.Contains("GetAllOrSearch", code);
+    }
+}