chore(claude-do): merge Bind-Churn: DetailsIsland.BindAsync feuert ~1900x/Tag, 91-96

ClaudeDo-Task: 351cacc4-3e11-4b3e-a89e-4efc4bd0448e

src/ClaudeDo.Ui/Services/OperationTiming.cs

@@ -21,7 +21,12 @@ public sealed class OperationTiming
     public static string DefaultPath =>
         Path.Combine(Paths.AppDataRoot(), "logs", "operation-timing.ndjson");
 
-    public static OperationTiming Shared { get; } = new(DefaultPath);
+    // Settable, not just get-only: xUnit constructs real ViewModels (DetailsIslandViewModel,
+    // TasksIslandViewModel, ...) that call Shared.Record directly, so without a way to redirect
+    // it every test run appended its churn straight into the live app's NDJSON file at the real
+    // AppData path — see Ui.Tests' TestSetup module initializer, which points this at a temp file
+    // for the whole test process before any test runs.
+    public static OperationTiming Shared { get; set; } = new(DefaultPath);
 
     private static readonly int ProcessId = Environment.ProcessId;