feat(ui): separate OperationStatus per worktree action (refresh/cleanup/reset/force-remove/batch-merge)

Replaces the shared IsBusy/IsMerging flags in WorktreesOverviewModalViewModel and the
reset flow in WorktreesSettingsTabViewModel with dedicated OperationStatus instances
shown via OperationIndicator, so a running Refresh no longer blocks the Cleanup
indicator. ForceRemove gains a CanExecute guard against re-entrancy while it's running,
and the reconcile tick's busy guard now checks all four action statuses instead of the
old IsBusy||IsMerging pair.

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

@@ -117,4 +117,29 @@ public class WorktreesOverviewReconcileTickTests
         Assert.False(vm.Rows.Single(r => r.TaskId == "d").IsChecked);
         Assert.Equal(1, vm.SelectedCount);
     }
+
+    [Theory]
+    [InlineData("refresh")]
+    [InlineData("cleanup")]
+    [InlineData("forceRemove")]
+    [InlineData("batchMerge")]
+    public async Task Tick_skips_the_reload_while_any_action_status_is_running(string which)
+    {
+        var (vm, worker) = await BuildLoadedAsync();
+        var status = which switch
+        {
+            "refresh" => vm.RefreshStatus,
+            "cleanup" => vm.CleanupStatus,
+            "forceRemove" => vm.ForceRemoveStatus,
+            "batchMerge" => vm.BatchMergeStatus,
+            _ => throw new ArgumentOutOfRangeException(nameof(which)),
+        };
+
+        using var op = status.Begin("running");
+        worker.Worktrees.Add(Wt("d"));
+
+        await vm.ReconcileTickAsync();
+
+        Assert.DoesNotContain(vm.Rows, r => r.TaskId == "d");
+    }
 }