fix(ui): render Output log directly on the console, not as a nested card

The Output tab embedded SessionTerminalView, which is itself a bordered terminal
card with its own header — a card inside the console card. Render the log lines
directly on the console body instead (the console already provides the terminal
chrome, traffic lights, and status chip), with auto-scroll moved to code-behind.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/ClaudeDo.Ui/Views/Islands/Detail/WorkConsole.axaml.cs

@@ -1,8 +1,40 @@
+using System;
+using System.Collections.Specialized;
 using Avalonia.Controls;
+using ClaudeDo.Ui.ViewModels.Islands;
 
 namespace ClaudeDo.Ui.Views.Islands.Detail;
 
 public partial class WorkConsole : UserControl
 {
-    public WorkConsole() => InitializeComponent();
+    private INotifyCollectionChanged? _log;
+
+    public WorkConsole()
+    {
+        InitializeComponent();
+        DataContextChanged += OnDataContextChanged;
+    }
+
+    private void OnDataContextChanged(object? sender, EventArgs e)
+    {
+        if (_log is not null)
+            _log.CollectionChanged -= OnLogChanged;
+
+        _log = (DataContext as DetailsIslandViewModel)?.Log;
+
+        if (_log is not null)
+            _log.CollectionChanged += OnLogChanged;
+    }
+
+    private void OnLogChanged(object? sender, NotifyCollectionChangedEventArgs e)
+    {
+        if (e.Action != NotifyCollectionChangedAction.Add) return;
+        EventHandler? handler = null;
+        handler = (_, _) =>
+        {
+            LogScroll.LayoutUpdated -= handler;
+            LogScroll.ScrollToEnd();
+        };
+        LogScroll.LayoutUpdated += handler;
+    }
 }