fix(ui): UsagePillViewModel loads snapshot on connection restore

The ctor-time LoadAsync races WorkerClient.StartAsync, so the SignalR
call fails silently and the pill only fills on the next worker poll
(up to 900s). Subscribe to ConnectionRestoredEvent, which also fires
on the first successful connect, to retry the cached snapshot.

tests/ClaudeDo.Ui.Tests/ViewModels/UsagePillViewModelTests.cs

@@ -144,4 +144,20 @@ public class UsagePillViewModelTests
 
         Assert.Contains("12", vm.Text);
     }
+
+    // ── ConnectionRestored event ─────────────────────────────────────────────
+
+    [Fact]
+    public void ConnectionRestored_Event_LoadsSnapshot()
+    {
+        var worker = new FakeWorker();
+        var vm = new UsagePillViewModel(worker);
+        Assert.Null(vm.Snapshot);
+
+        worker.InitialSnapshot = Snapshot(fiveHourPercent: 25);
+        worker.RaiseConnectionRestored();
+
+        Assert.NotNull(vm.Snapshot);
+        Assert.Contains("25", vm.Text);
+    }
 }