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/DownloadFolderOpenE2ERedScenarioTests.cs

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+using System;
+using System.IO;
+using System.Threading.Tasks;
+using Paca.App.Utils;
+using Paca.Core.QuickActions;
+using Xunit;
+
+namespace Paca.Tests.App;
+
+public class DownloadFolderOpenE2ERedScenarioTests
+{
+    private static readonly string SolutionRoot = Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, "..", "..", "..", "..", ".."));
+
+    [Fact]
+    public void Test01_ExplorerLauncher_CreatesMissingFolder_And_LaunchesExplorerWithFolderPath()
+    {
+        string uniqueFolder = Path.Combine(Path.GetTempPath(), $"paca_e2e_folder_{Guid.NewGuid():N}");
+        try
+        {
+            Assert.False(Directory.Exists(uniqueFolder), "Test directory should not exist prior to test");
+
+            // Build start info for folder opening
+            var psi = ExplorerLauncher.BuildProcessStartInfo(null, uniqueFolder);
+
+            // 1. Directory must be created automatically on disk!
+            Assert.True(Directory.Exists(uniqueFolder), "ExplorerLauncher should auto-create destination folder if missing");
+
+            // 2. Must launch explorer.exe directly with quoted path argument
+            Assert.Equal("explorer.exe", psi.FileName);
+            Assert.Contains(uniqueFolder, psi.Arguments);
+            Assert.True(psi.UseShellExecute);
+        }
+        finally
+        {
+            if (Directory.Exists(uniqueFolder)) Directory.Delete(uniqueFolder);
+        }
+    }
+
+    [Fact]
+    public void Test02_ExplorerLauncher_SelectedFile_LaunchesSelectArgument()
+    {
+        string uniqueFolder = Path.Combine(Path.GetTempPath(), $"paca_e2e_select_{Guid.NewGuid():N}");
+        Directory.CreateDirectory(uniqueFolder);
+        string testFile = Path.Combine(uniqueFolder, "test_video.mp4");
+        File.WriteAllText(testFile, "dummy");
+
+        try
+        {
+            var psi = ExplorerLauncher.BuildProcessStartInfo(testFile, uniqueFolder);
+            Assert.Equal("explorer.exe", psi.FileName);
+            Assert.Contains("/select,", psi.Arguments);
+            Assert.Contains(testFile, psi.Arguments);
+            Assert.True(psi.UseShellExecute);
+        }
+        finally
+        {
+            if (Directory.Exists(uniqueFolder)) Directory.Delete(uniqueFolder, true);
+        }
+    }
+
+    [Fact]
+    public async Task Test03_QuickAction_MediaOpenOutputFolder_ActuallyInvokesFolderOpener()
+    {
+        var catalog = new QuickActionCatalog();
+        var action = catalog.GetAction("media.open_output_folder");
+        Assert.NotNull(action);
+
+        string? openedFolder = "NOT_CALLED";
+        var ctx = new QuickActionContext(
+            OutputFolder: @"C:\Downloads\Paca",
+            FolderOpener: path => openedFolder = path
+        );
+
+        Assert.NotNull(action.Handler);
+        var result = await action.Handler.Invoke(ctx);
+
+        Assert.True(result.Success);
+        // It must NOT just display a toast, it must invoke FolderOpener!
+        Assert.Null(openedFolder); // FolderOpener(null) opens the output folder
+    }
+
+    [Fact]
+    public void Test04_NewTabPage_OpenDownloadsMessage_CallsOpenInExplorer()
+    {
+        string mainCs = File.ReadAllText(Path.Combine(SolutionRoot, "src", "Paca.App", "MainWindow.xaml.cs"));
+        Assert.Contains("case \"ntp:opendownloads\":", mainCs);
+        
+        // ntp:opendownloads must call OpenInExplorer(null) to open the real Windows Explorer folder
+        int idx = mainCs.IndexOf("case \"ntp:opendownloads\":", StringComparison.OrdinalIgnoreCase);
+        Assert.True(idx >= 0);
+        string block = mainCs.Substring(idx, 200);
+        Assert.Contains("OpenInExplorer(null)", block);
+    }
+}