feat(ui): live task updates from worker events + planning polish

Wire TasksIslandViewModel to TaskUpdated/WorktreeUpdated/TaskMessage worker
events so rows refresh without a full reload; add ForegroundHelper to permit
wt.exe to take foreground on planning launch; misc UI polish on lists, task
rows and settings modal.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/ClaudeDo.Ui/Services/ForegroundHelper.cs

@@ -0,0 +1,19 @@
+using System.Runtime.InteropServices;
+
+namespace ClaudeDo.Ui.Services;
+
+internal static class ForegroundHelper
+{
+    private const int ASFW_ANY = -1;
+
+    [DllImport("user32.dll", SetLastError = true)]
+    private static extern bool AllowSetForegroundWindow(int dwProcessId);
+
+    // Grants any process the right to take foreground on next SetForegroundWindow call.
+    // Used before RPCs that cause a helper process (e.g. wt.exe) to spawn a new window.
+    public static void AllowAny()
+    {
+        if (!OperatingSystem.IsWindows()) return;
+        try { AllowSetForegroundWindow(ASFW_ANY); } catch { }
+    }
+}

src/ClaudeDo.Ui/Services/IWorkerClient.cs

@@ -2,6 +2,10 @@ namespace ClaudeDo.Ui.Services;
 
 public interface IWorkerClient
 {
+    event Action<string>? TaskUpdatedEvent;
+    event Action<string>? WorktreeUpdatedEvent;
+    event Action<string, string>? TaskMessageEvent;
+
     Task WakeQueueAsync();
     Task StartPlanningSessionAsync(string taskId, CancellationToken ct = default);
     Task ResumePlanningSessionAsync(string taskId, CancellationToken ct = default);