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/MainWindow.axaml

@@ -1,20 +1,55 @@
 <Window xmlns="https://github.com/avaloniaui"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:vm="using:ClaudeDo.Ui.ViewModels"
+        xmlns:v="using:ClaudeDo.Ui.Views"
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        mc:Ignorable="d" d:DesignWidth="1200" d:DesignHeight="700"
         x:Class="ClaudeDo.Ui.Views.MainWindow"
         x:DataType="vm:MainWindowViewModel"
-        Icon="/Assets/avalonia-logo.ico"
-        Title="ClaudeDo.App">
+        Title="ClaudeDo" Width="1200" Height="700"
+        MinWidth="800" MinHeight="500">
 
-    <Design.DataContext>
-        <!-- This only sets the DataContext for the previewer in an IDE,
-             to set the actual DataContext for runtime, set the DataContext property in code (look at App.axaml.cs) -->
-        <vm:MainWindowViewModel/>
-    </Design.DataContext>
+    <DockPanel>
+        <!-- Status Bar at bottom -->
+        <v:StatusBarView DockPanel.Dock="Bottom" DataContext="{Binding StatusBar}" />
 
-    <TextBlock Text="{Binding Greeting}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
+        <!-- Main 3-column layout -->
+        <Grid ColumnDefinitions="220,Auto,*,Auto,350">
+            <!-- Lists pane -->
+            <DockPanel Grid.Column="0">
+                <StackPanel DockPanel.Dock="Top" Orientation="Horizontal" Margin="4">
+                    <TextBlock Text="Lists" FontWeight="Bold" FontSize="14" VerticalAlignment="Center" Margin="4,0"/>
+                </StackPanel>
+                <StackPanel DockPanel.Dock="Bottom" Orientation="Horizontal" Spacing="4" Margin="4">
+                    <Button Content="+" Command="{Binding AddListCommand}" ToolTip.Tip="Add List" MinWidth="30"/>
+                    <Button Content="E" Command="{Binding EditListCommand}" ToolTip.Tip="Edit List" MinWidth="30"/>
+                    <Button Content="-" Command="{Binding DeleteListCommand}" ToolTip.Tip="Delete List" MinWidth="30"/>
+                </StackPanel>
+                <ListBox ItemsSource="{Binding Lists}"
+                         SelectedItem="{Binding SelectedList}"
+                         Margin="4">
+                    <ListBox.ItemTemplate>
+                        <DataTemplate x:DataType="vm:ListItemViewModel">
+                            <StackPanel Margin="4,2">
+                                <TextBlock Text="{Binding Name}" FontWeight="SemiBold"/>
+                                <TextBlock Text="{Binding WorkingDir}" FontSize="10" Foreground="Gray"
+                                           IsVisible="{Binding WorkingDir, Converter={x:Static ObjectConverters.IsNotNull}}"/>
+                            </StackPanel>
+                        </DataTemplate>
+                    </ListBox.ItemTemplate>
+                </ListBox>
+            </DockPanel>
 
+            <GridSplitter Grid.Column="1" Width="4" ResizeDirection="Columns"/>
+
+            <!-- Tasks pane -->
+            <v:TaskListView Grid.Column="2" DataContext="{Binding TaskList}" />
+
+            <GridSplitter Grid.Column="3" Width="4" ResizeDirection="Columns"/>
+
+            <!-- Detail pane -->
+            <v:TaskDetailView Grid.Column="4" DataContext="{Binding TaskDetail}" />
+        </Grid>
+    </DockPanel>
 </Window>