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

tests/Paca.Tests/Infrastructure/SettingsViewModelTests.cs

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+using Paca.App.ViewModels;
+using Paca.Core.Config;
+using Xunit;
+
+namespace Paca.Tests.Infrastructure;
+
+public sealed class SettingsViewModelTests
+{
+    [Fact]
+    public void LoadFromConfig_MapsAllPropertiesAccurately()
+    {
+        var config = new AppConfig
+        {
+            Theme = "light",
+            AccentColor = "#2563EB",
+            Concurrency = 16,
+            MaxConcurrentDownloads = 5,
+            OutputFolder = @"C:\Downloads\Videos",
+            ToastDurationMs = 4500,
+            ReduceMotion = true
+        };
+
+        var vm = new SettingsViewModel(config);
+
+        Assert.Equal("light", vm.Theme);
+        Assert.Equal("#2563EB", vm.AccentColor);
+        Assert.Equal(16, vm.Concurrency);
+        Assert.Equal(5, vm.MaxConcurrentDownloads);
+        Assert.Equal(@"C:\Downloads\Videos", vm.OutputFolder);
+        Assert.Equal(4500, vm.ToastDurationMs);
+        Assert.True(vm.ReduceMotion);
+        Assert.False(vm.IsDirty);
+        Assert.Equal(0, vm.DirtyCount);
+    }
+
+    [Fact]
+    public void PropertyChanged_TracksDirtyStateAccurately()
+    {
+        var config = new AppConfig();
+        var vm = new SettingsViewModel(config);
+
+        Assert.False(vm.IsDirty);
+
+        vm.Concurrency = 32;
+        Assert.True(vm.IsDirty);
+        Assert.True(vm.DirtyCount >= 1);
+
+        // 원본 값으로 복구하면 IsDirty 해제
+        vm.Concurrency = config.Concurrency;
+        Assert.False(vm.IsDirty);
+        Assert.Equal(0, vm.DirtyCount);
+    }
+
+    [Fact]
+    public void Validate_CatchesInvalidInputs()
+    {
+        var config = new AppConfig();
+        var vm = new SettingsViewModel(config);
+
+        Assert.True(vm.Validate());
+        Assert.False(vm.HasErrors);
+
+        // 1. 유효하지 않은 세그먼트 동시 수
+        vm.Concurrency = 0;
+        Assert.False(vm.Validate());
+        Assert.True(vm.HasErrors);
+        Assert.Contains("세그먼트", vm.ValidationSummary);
+
+        vm.Concurrency = 8;
+        Assert.True(vm.Validate());
+
+        // 2. 유효하지 않은 토스트 지속시간
+        vm.ToastDurationMs = 100;
+        Assert.False(vm.Validate());
+        Assert.True(vm.HasErrors);
+
+        vm.ToastDurationMs = 3000;
+        Assert.True(vm.Validate());
+
+        // 3. 유효하지 않은 강조색 포맷
+        vm.AccentColor = "InvalidHex";
+        Assert.False(vm.Validate());
+        Assert.True(vm.HasErrors);
+
+        vm.AccentColor = "#6366F1";
+        Assert.True(vm.Validate());
+
+        // 4. 유효하지 않은 예약 시간 포맷
+        vm.DownloadScheduleWindow = "25:99-99:00";
+        Assert.False(vm.Validate());
+        Assert.True(vm.HasErrors);
+
+        vm.DownloadScheduleWindow = "02:00-08:00";
+        Assert.True(vm.Validate());
+    }
+
+    [Fact]
+    public void CommitToConfig_UpdatesTargetConfigCompletely()
+    {
+        var sourceConfig = new AppConfig();
+        var vm = new SettingsViewModel(sourceConfig)
+        {
+            Theme = "highcontrast",
+            AccentColor = "#34D399",
+            Concurrency = 12,
+            MaxConcurrentDownloads = 6,
+            OutputFolder = @"D:\Media\Saved",
+            ReduceMotion = true,
+            AutoStart = true
+        };
+
+        var target = new AppConfig();
+        vm.CommitToConfig(target);
+
+        Assert.Equal("highcontrast", target.Theme);
+        Assert.Equal("#34D399", target.AccentColor);
+        Assert.Equal(12, target.Concurrency);
+        Assert.Equal(6, target.MaxConcurrentDownloads);
+        Assert.Equal(@"D:\Media\Saved", target.OutputFolder);
+        Assert.True(target.ReduceMotion);
+        Assert.True(target.AutoStart);
+    }
+
+    [Fact]
+    public void ResetToDefaults_RestoresStandardDefaults()
+    {
+        var config = new AppConfig
+        {
+            Theme = "light",
+            Concurrency = 32,
+            MaxConcurrentDownloads = 10
+        };
+
+        var vm = new SettingsViewModel(config);
+        vm.ResetToDefaults();
+
+        Assert.Equal("dark", vm.Theme);
+        Assert.Equal(8, vm.Concurrency);
+        Assert.Equal(3, vm.MaxConcurrentDownloads);
+    }
+}