fix: complete retail parity stability pass

tests/AcDream.App.Tests/Settings/RuntimeSettingsControllerTests.cs

@@ -11,6 +11,40 @@ namespace AcDream.App.Tests.Settings;
 
 public sealed class RuntimeSettingsControllerTests
 {
+    [Theory]
+    [InlineData(3, 3, 3)]
+    [InlineData(5, 4, 5)]
+    [InlineData(8, 4, 8)]
+    [InlineData(12, 4, 12)]
+    [InlineData(25, 4, 25)]
+    public void LandscapeDrawDistance_IsTheRetailFarRadiusValue(
+        int value,
+        int expectedNear,
+        int expectedFar)
+    {
+        QualitySettings result = RuntimeSettingsController
+            .ApplyLandscapeDrawDistance(
+                QualitySettings.From(QualityPreset.High),
+                value);
+
+        Assert.Equal(expectedNear, result.NearRadius);
+        Assert.Equal(expectedFar, result.FarRadius);
+    }
+
+    [Theory]
+    [InlineData(0)]
+    [InlineData(2)]
+    [InlineData(26)]
+    public void InvalidStoredLandscapeDistance_PreservesThePreset(int value)
+    {
+        QualitySettings original = QualitySettings.From(QualityPreset.High);
+
+        QualitySettings result = RuntimeSettingsController
+            .ApplyLandscapeDrawDistance(original, value);
+
+        Assert.Equal(original, result);
+    }
+
     [Fact]
     public void ConstructionLoadsEachBagOnceAndPublishesOneStartupSnapshot()
     {