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/ChromeDownloadManagerParityTests.cs

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+using System;
+using Paca.App.Browser.Features;
+using Xunit;
+
+namespace Paca.Tests.App;
+
+public class ChromeDownloadManagerParityTests
+{
+    private class FakeDownloadOperation : IDownloadOperation
+    {
+        public string Uri { get; set; } = "https://example.com/file.zip";
+        public string FileName { get; set; } = "file.zip";
+        public long TotalBytesToReceive { get; set; } = 100 * 1024 * 1024; // 100MB
+        public long BytesReceived { get; set; } = 0;
+        public string State { get; set; } = "InProgress";
+        public event Action? Changed;
+
+        public void Pause() { State = "Paused"; Changed?.Invoke(); }
+        public void Resume() { State = "InProgress"; Changed?.Invoke(); }
+        public void Cancel() { State = "Cancelled"; Changed?.Invoke(); }
+        public void Notify(long received, string state)
+        {
+            BytesReceived = received;
+            State = state;
+            Changed?.Invoke();
+        }
+    }
+
+    [Fact]
+    public void PageDownloadItem_SizeProgressText_Formats_Correctly()
+    {
+        var fake = new FakeDownloadOperation { TotalBytesToReceive = 100 * 1024 * 1024, BytesReceived = 25 * 1024 * 1024 };
+        var item = new PageDownloadItem(fake, "file.zip");
+
+        Assert.Equal("25.0 MB / 100.0 MB", item.SizeProgressText);
+
+        var unknownTotal = new FakeDownloadOperation { TotalBytesToReceive = 0, BytesReceived = 10 * 1024 * 1024 };
+        var item2 = new PageDownloadItem(unknownTotal, "stream.bin");
+        Assert.Equal("10.0 MB", item2.SizeProgressText);
+    }
+
+    [Fact]
+    public void PageDownloadItem_EtaText_Calculations()
+    {
+        var fake = new FakeDownloadOperation { TotalBytesToReceive = 100 * 1024 * 1024, BytesReceived = 50 * 1024 * 1024 };
+        var item = new PageDownloadItem(fake, "file.zip");
+
+        // When bps is 0
+        Assert.Equal("—", item.EtaText);
+
+        // 50MB remaining. Speed = 5MB/s -> 10 seconds remaining
+        item.UpdateSpeed(50 * 1024 * 1024, TimeSpan.FromSeconds(1));
+        item.UpdateSpeed(55 * 1024 * 1024, TimeSpan.FromSeconds(1)); // 5 MB/s
+        Assert.Contains("초 남음", item.EtaText);
+
+        // When completed
+        fake.Notify(100 * 1024 * 1024, "Completed");
+        Assert.Equal("완료됨", item.EtaText);
+    }
+}