feat(ui): default to the Git tab for manual and interactive tasks

A hand-driven task produces no streamed agent output, so the Output tab
opened empty. Bind now selects git for manual/interactive rows and resets
to output for autonomous ones.

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

@@ -80,4 +80,37 @@ public class DetailsIslandTabsTests : IDisposable
         Assert.True(vm.IsOutputTab);
         Assert.False(vm.IsGitTab);
     }
+
+    [Fact]
+    public void Bind_manual_task_defaults_to_git_tab()
+    {
+        var vm = NewVm();
+
+        vm.Bind(new TaskRowViewModel { Id = Guid.NewGuid().ToString("N"), IsManual = true });
+
+        Assert.True(vm.IsGitTab);
+        Assert.False(vm.IsOutputTab);
+    }
+
+    [Fact]
+    public void Bind_interactive_task_defaults_to_git_tab()
+    {
+        var vm = NewVm();
+
+        vm.Bind(new TaskRowViewModel { Id = Guid.NewGuid().ToString("N"), HasInteractiveSession = true });
+
+        Assert.True(vm.IsGitTab);
+    }
+
+    [Fact]
+    public void Bind_autonomous_task_defaults_to_output_tab()
+    {
+        var vm = NewVm();
+        vm.SelectTabCommand.Execute("git");
+
+        vm.Bind(new TaskRowViewModel { Id = Guid.NewGuid().ToString("N") });
+
+        Assert.True(vm.IsOutputTab);
+        Assert.False(vm.IsGitTab);
+    }
 }