fix: complete retail parity stability pass

src/AcDream.App/Settings/RuntimeSettingsController.cs

@@ -161,11 +161,18 @@ internal sealed class RuntimeSettingsController :
         Func<uint, bool>? characterOptionValue = null)
     {
         _storage = storage ?? throw new ArgumentNullException(nameof(storage));
-        _resolveQuality = resolveQuality ?? ResolveQuality;
+        Display = _storage.LoadDisplay();
+        // Render.LandscapeDrawDistance is one of retail's actual quality
+        // dimensions, not a menu index. Apply it to the production far tier
+        // before environment overrides; ACDREAM_FAR_RADIUS therefore keeps
+        // its documented highest precedence for diagnostic runs.
+        _resolveQuality = resolveQuality
+            ?? (preset => ResolveQuality(
+                preset,
+                Display.LandscapeDrawDistance));
         _log = log ?? Console.WriteLine;
         _characterOptionValue = characterOptionValue;
 
-        Display = _storage.LoadDisplay();
         Audio = _storage.LoadAudio();
         Chat = _storage.LoadChat();
         _defaultCharacter = _storage.LoadCharacter(DefaultToonKey);
@@ -613,6 +620,35 @@ internal sealed class RuntimeSettingsController :
     /// <inheritdoc cref="ServerOptionsSeeded"/>
     public void NotifyServerOptionsSeeded() => ServerOptionsSeeded?.Invoke();
 
-    private static QualitySettings ResolveQuality(QualityPreset preset) =>
-        QualitySettings.WithEnvOverrides(QualitySettings.From(preset));
+    private static QualitySettings ResolveQuality(
+        QualityPreset preset,
+        int landscapeDrawDistance)
+    {
+        QualitySettings quality = ApplyLandscapeDrawDistance(
+            QualitySettings.From(preset),
+            landscapeDrawDistance);
+        return QualitySettings.WithEnvOverrides(quality);
+    }
+
+    internal static QualitySettings ApplyLandscapeDrawDistance(
+        QualitySettings quality,
+        int landscapeDrawDistance)
+    {
+        // Retail's enum contains 3,5,8,11,15,25 and @render accepts every
+        // integer in [5,25]. Values outside the union's structural [3,25]
+        // range can only come from an old/corrupt settings file, so preserve
+        // the preset rather than constructing an invalid streaming window.
+        if (landscapeDrawDistance is >= 3 and <= 25)
+        {
+            quality = quality with
+            {
+                NearRadius = Math.Min(
+                    quality.NearRadius,
+                    landscapeDrawDistance),
+                FarRadius = landscapeDrawDistance,
+            };
+        }
+
+        return quality;
+    }
 }