refactor(claude-do): merge Material icons: delete dead Icon.* geometries + guard test

ClaudeDo-Task: 13b9cdfe-2b78-4764-9edb-8e944ec260ee

tests/ClaudeDo.Ui.Tests/MdiIconNamesTests.cs

@@ -0,0 +1,43 @@
+using System.Text.RegularExpressions;
+using Material.Icons;
+
+namespace ClaudeDo.Ui.Tests;
+
+/// <summary>Guards every <c>mdi:Name</c> literal in the Ui sources: an unknown kind makes IconKeyConverter return null and the icon silently vanishes.</summary>
+public class MdiIconNamesTests
+{
+    /// <summary><c>mdi:Name</c> in XAML/C# plus <c>MdiGeometry("Name")</c> (MarkdownView prefixes the key itself).</summary>
+    private static readonly Regex NamePattern = new(@"mdi:(\w+)|MdiGeometry\(""(\w+)""\)", RegexOptions.Compiled);
+
+    [Fact]
+    public void EveryMdiNameInUiSources_IsAMaterialIconKind()
+    {
+        var uiDir = Path.Combine(FindRepoRoot(), "src", "ClaudeDo.Ui");
+        var files = Directory.EnumerateFiles(uiDir, "*.*", SearchOption.AllDirectories)
+            .Where(f => (f.EndsWith(".axaml") || f.EndsWith(".cs"))
+                        && !f.Contains($"{Path.DirectorySeparatorChar}obj{Path.DirectorySeparatorChar}")
+                        && !f.Contains($"{Path.DirectorySeparatorChar}bin{Path.DirectorySeparatorChar}"));
+
+        var unknown = new List<string>();
+        var seen = 0;
+        foreach (var file in files)
+            foreach (Match m in NamePattern.Matches(File.ReadAllText(file)))
+            {
+                seen++;
+                var name = m.Groups[1].Success ? m.Groups[1].Value : m.Groups[2].Value;
+                if (!Enum.TryParse<MaterialIconKind>(name, out _))
+                    unknown.Add($"{Path.GetRelativePath(uiDir, file)}: {name}");
+            }
+
+        Assert.True(seen > 0, "scan found no mdi: names — the pattern or the repo-root lookup is broken");
+        Assert.True(unknown.Count == 0, "Unknown MaterialIconKind names:\n" + string.Join('\n', unknown));
+    }
+
+    private static string FindRepoRoot()
+    {
+        var dir = new DirectoryInfo(AppContext.BaseDirectory);
+        while (dir is not null && !File.Exists(Path.Combine(dir.FullName, "ClaudeDo.slnx")))
+            dir = dir.Parent;
+        return dir?.FullName ?? throw new InvalidOperationException("ClaudeDo.slnx not found above " + AppContext.BaseDirectory);
+    }
+}