feat(ui): wire avalonia desktop ui to data and worker

App: build a ServiceProvider in Program.cs (AppSettings, SqliteConnectionFactory,
all repositories, GitService, WorkerClient, all view-models), apply schema, then
hand control to Avalonia. App.OnFrameworkInitializationCompleted resolves
MainWindowViewModel from the container.

Ui:
- AppSettings POCO loaded from ~/.todo-app/ui.config.json (db path, hub url).
- WorkerClient wraps HubConnection with auto-reconnect, exposes IsConnected and
  ActiveTasks plus C# events for TaskStarted/Finished/Message/Updated and
  WorktreeUpdated; all inbound events are marshalled to the UI thread.
- ViewModels: MainWindow (lists CRUD via ListEditor dialog), TaskList (load by
  list, add/edit/delete, auto WakeQueue on agent+queued create), TaskItem
  (RunNow gated on connection + status), TaskDetail (description, result, live
  ndjson rolling buffer of 500 lines, worktree branch/diff with merge/keep/
  discard via GitService), StatusBar, ListEditor, TaskEditor.
- Views: 3-pane MainWindow (lists | tasks | detail) with GridSplitters, status
  bar, dialog windows for the editors. Status badges via StatusColorConverter.
- Markdown rendering, folder picker, delete-confirmation, settings dialog and
  scroll-to-bottom on the live log are intentionally TODO -- functional
  scaffold only.

Tests: also debounce the FIFO queue test (poll instead of Task.Delay(200)) so
the assertion isn't racy when the suite runs alongside the slower git tests.
38 tests pass.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/ClaudeDo.Ui/Views/TaskDetailView.axaml

@@ -0,0 +1,93 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:ClaudeDo.Ui.ViewModels"
+             xmlns:conv="using:ClaudeDo.Ui.Converters"
+             x:Class="ClaudeDo.Ui.Views.TaskDetailView"
+             x:DataType="vm:TaskDetailViewModel">
+    <ScrollViewer>
+        <StackPanel Margin="8" Spacing="8"
+                    IsVisible="{Binding Title, Converter={x:Static StringConverters.IsNotNullOrEmpty}}">
+
+            <!-- Header -->
+            <TextBlock Text="{Binding Title}" FontWeight="Bold" FontSize="16"/>
+            <Border CornerRadius="3" Padding="6,2" HorizontalAlignment="Left"
+                    Background="{Binding StatusText, Converter={x:Static conv:StatusColorConverter.Instance}}">
+                <TextBlock Text="{Binding StatusText}" Foreground="White" FontSize="11"/>
+            </Border>
+
+            <!-- Description -->
+            <TextBlock Text="Description" FontWeight="SemiBold" Margin="0,8,0,2"/>
+            <!-- TODO: Markdown rendering -->
+            <TextBox Text="{Binding Description, Mode=OneWay}" IsReadOnly="True"
+                     AcceptsReturn="True" TextWrapping="Wrap" MinHeight="60"
+                     IsVisible="{Binding Description, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
+            <TextBlock Text="(no description)" Foreground="Gray" FontStyle="Italic"
+                       IsVisible="{Binding Description, Converter={x:Static StringConverters.IsNullOrEmpty}}"/>
+
+            <!-- Result -->
+            <TextBlock Text="Result" FontWeight="SemiBold" Margin="0,8,0,2"/>
+            <!-- TODO: Markdown rendering -->
+            <TextBox Text="{Binding Result, Mode=OneWay}" IsReadOnly="True"
+                     AcceptsReturn="True" TextWrapping="Wrap" MinHeight="80"
+                     IsVisible="{Binding Result, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
+            <TextBlock Text="(no result yet)" Foreground="Gray" FontStyle="Italic"
+                       IsVisible="{Binding Result, Converter={x:Static StringConverters.IsNullOrEmpty}}"/>
+
+            <!-- Log path -->
+            <StackPanel Orientation="Horizontal" Spacing="4"
+                        IsVisible="{Binding LogPath, Converter={x:Static StringConverters.IsNotNullOrEmpty}}">
+                <TextBlock Text="Log:" FontWeight="SemiBold" VerticalAlignment="Center"/>
+                <TextBlock Text="{Binding LogPath}" FontSize="11" Foreground="Gray" VerticalAlignment="Center"/>
+            </StackPanel>
+
+            <!-- Live stream -->
+            <TextBlock Text="Live Output" FontWeight="SemiBold" Margin="0,8,0,2"/>
+            <Border BorderBrush="Gray" BorderThickness="1" CornerRadius="3" Padding="4"
+                    MaxHeight="200">
+                <ScrollViewer>
+                    <ItemsControl ItemsSource="{Binding LiveLines}">
+                        <ItemsControl.ItemTemplate>
+                            <DataTemplate>
+                                <TextBlock Text="{Binding}" FontFamily="Consolas,Courier New,monospace"
+                                           FontSize="11" TextWrapping="NoWrap"/>
+                            </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                    </ItemsControl>
+                </ScrollViewer>
+            </Border>
+
+            <!-- Worktree section -->
+            <Border IsVisible="{Binding HasWorktree}" BorderBrush="CornflowerBlue"
+                    BorderThickness="1" CornerRadius="5" Padding="8" Margin="0,8,0,0">
+                <StackPanel Spacing="6">
+                    <TextBlock Text="Worktree" FontWeight="Bold" FontSize="14"/>
+                    <StackPanel Orientation="Horizontal" Spacing="8">
+                        <TextBlock Text="Branch:" FontWeight="SemiBold"/>
+                        <TextBlock Text="{Binding BranchName}" FontFamily="Consolas,Courier New,monospace"/>
+                    </StackPanel>
+                    <StackPanel Orientation="Horizontal" Spacing="8">
+                        <TextBlock Text="State:" FontWeight="SemiBold"/>
+                        <TextBlock Text="{Binding WorktreeState}"/>
+                    </StackPanel>
+                    <TextBlock Text="Diff Stat:" FontWeight="SemiBold"
+                               IsVisible="{Binding DiffStat, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
+                    <TextBox Text="{Binding DiffStat, Mode=OneWay}" IsReadOnly="True"
+                             AcceptsReturn="True" FontFamily="Consolas,Courier New,monospace" FontSize="11"
+                             IsVisible="{Binding DiffStat, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
+
+                    <!-- Worktree actions -->
+                    <WrapPanel Orientation="Horizontal" Margin="0,4,0,0">
+                        <Button Content="Open Worktree" Command="{Binding OpenWorktreeCommand}" Margin="0,0,4,4"/>
+                        <Button Content="Show Diff" Command="{Binding ShowDiffCommand}" Margin="0,0,4,4"/>
+                        <Button Content="Merge into main" Command="{Binding MergeIntoMainCommand}"
+                                IsEnabled="{Binding CanWorktreeAction}" Margin="0,0,4,4"/>
+                        <Button Content="Keep as branch" Command="{Binding KeepAsBranchCommand}"
+                                IsEnabled="{Binding CanWorktreeAction}" Margin="0,0,4,4"/>
+                        <Button Content="Discard" Command="{Binding DiscardCommand}"
+                                IsEnabled="{Binding CanWorktreeAction}" Margin="0,0,4,4"/>
+                    </WrapPanel>
+                </StackPanel>
+            </Border>
+        </StackPanel>
+    </ScrollViewer>
+</UserControl>