fead.圆角，终于统一

LanMountainDesktop.Tests/CornerRadiusStyleTests.cs

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+using Avalonia;
+using LanMountainDesktop.PluginSdk;
+using LanMountainDesktop.Settings.Core;
+using LanMountainDesktop.Shared.Contracts;
+using Xunit;
+
+namespace LanMountainDesktop.Tests;
+
+public sealed class CornerRadiusStyleTests
+{
+    [Theory]
+    [InlineData("Sharp", "Sharp")]
+    [InlineData("Balanced", "Balanced")]
+    [InlineData("Rounded", "Rounded")]
+    [InlineData("Open", "Open")]
+    [InlineData("Unknown", "Balanced")]
+    [InlineData(null, "Balanced")]
+    public void NormalizeCornerRadiusStyle_ReturnsValidStyleOrDefault(string? input, string expected)
+    {
+        Assert.Equal(expected, GlobalAppearanceSettings.NormalizeCornerRadiusStyle(input));
+    }
+
+    [Fact]
+    public void PluginAppearanceContext_ResolveCornerRadius_ReturnsFixedTokenValues()
+    {
+        var context = new PluginAppearanceContext(new PluginAppearanceSnapshot(
+            CornerRadiusTokens: new PluginCornerRadiusTokens(
+                Micro: 6d,
+                Xs: 12d,
+                Sm: 14d,
+                Md: 20d,
+                Lg: 28d,
+                Xl: 32d,
+                Island: 36d,
+                Component: 24d),
+            ThemeVariant: "Light"));
+
+        // Preset resolution should return fixed values from tokens regardless of any legacy scale
+        Assert.Equal(20d, context.ResolveCornerRadius(PluginCornerRadiusPreset.Md), 3);
+        Assert.Equal(20d, context.ResolveCornerRadius(PluginCornerRadiusPreset.Md, maximum: 15d), 3);
+        Assert.Equal(20d, context.ResolveScaledCornerRadius(18d), 3);
+        Assert.Equal(24d, context.ResolveCornerRadius(PluginCornerRadiusPreset.Component), 3);
+    }
+
+    [Fact]
+    public void PluginDesktopComponentContext_ProvidesDirectTokenAccess()
+    {
+        var appearanceContext = new PluginAppearanceContext(new PluginAppearanceSnapshot(
+            CornerRadiusTokens: new PluginCornerRadiusTokens(6, 12, 14, 20, 28, 32, 36, 24),
+            ThemeVariant: "Dark"));
+
+        var context = new PluginDesktopComponentContext(
+            new PluginManifest("plugin.id", "Plugin Name", "plugin.dll"),
+            "C:\\Plugins\\plugin.id",
+            "C:\\Data\\plugin.id",
+            new NullServiceProvider(),
+            new Dictionary<string, object?>(),
+            "component-1",
+            null,
+            96d,
+            appearanceContext);
+
+        Assert.Equal(24d, context.ResolveScaledCornerRadius(12d), 3);
+        Assert.Equal(24d, context.ResolveScaledCornerRadius(12d, 8d, 18d), 3);
+    }
+
+    private sealed class NullServiceProvider : IServiceProvider
+    {
+        public object? GetService(Type serviceType) => null;
+    }
+}