feat(ui): unfinished planning session dialog

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ClaudeDo.Ui/Views/Modals/UnfinishedPlanningModalView.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="clr-namespace:ClaudeDo.Ui.ViewModels.Modals"
+        x:Class="ClaudeDo.Ui.Views.Modals.UnfinishedPlanningModalView"
+        x:DataType="vm:UnfinishedPlanningModalViewModel"
+        Title="Unfinished planning session"
+        Width="440" Height="200"
+        CanResize="False"
+        SystemDecorations="None"
+        ExtendClientAreaToDecorationsHint="True"
+        WindowStartupLocation="CenterOwner"
+        Background="{DynamicResource SurfaceBrush}">
+
+  <Window.KeyBindings>
+    <KeyBinding Gesture="Escape" Command="{Binding CancelCommand}"/>
+  </Window.KeyBindings>
+
+  <Window.Styles>
+    <Style Selector="Button.primary">
+      <Setter Property="Background" Value="{DynamicResource AccentBrush}"/>
+      <Setter Property="Foreground" Value="{DynamicResource DeepBrush}"/>
+      <Setter Property="FontWeight" Value="SemiBold"/>
+    </Style>
+  </Window.Styles>
+
+  <Border Background="{DynamicResource SurfaceBrush}"
+          BorderBrush="{DynamicResource LineBrush}"
+          BorderThickness="1">
+    <Grid RowDefinitions="36,*,52">
+
+      <!-- Title bar -->
+      <Border Grid.Row="0"
+              x:Name="TitleBar"
+              Background="{DynamicResource DeepBrush}"
+              BorderBrush="{DynamicResource LineBrush}"
+              BorderThickness="0,0,0,1"
+              PointerPressed="TitleBar_PointerPressed">
+        <Grid ColumnDefinitions="*,Auto" Margin="14,0">
+          <TextBlock Text="UNFINISHED PLANNING SESSION"
+                     FontFamily="{DynamicResource MonoFont}"
+                     FontSize="11"
+                     LetterSpacing="1.4"
+                     Foreground="{DynamicResource TextBrush}"
+                     VerticalAlignment="Center"/>
+          <Button Grid.Column="1"
+                  Classes="icon-btn"
+                  Content="✕"
+                  FontSize="12"
+                  Command="{Binding CancelCommand}"
+                  VerticalAlignment="Center"/>
+        </Grid>
+      </Border>
+
+      <!-- Body -->
+      <StackPanel Grid.Row="1" Margin="20,16" Spacing="8">
+        <TextBlock Text="{Binding TaskTitle}"
+                   FontWeight="SemiBold"
+                   Foreground="{DynamicResource TextBrush}"
+                   TextTrimming="CharacterEllipsis"/>
+        <TextBlock Foreground="{DynamicResource TextDimBrush}">
+          <Run Text="{Binding DraftCount}"/>
+          <Run Text=" draft task(s) waiting to be finalized."/>
+        </TextBlock>
+      </StackPanel>
+
+      <!-- Footer -->
+      <Border Grid.Row="2"
+              Background="{DynamicResource DeepBrush}"
+              BorderBrush="{DynamicResource LineBrush}"
+              BorderThickness="0,1,0,0">
+        <StackPanel Orientation="Horizontal" Spacing="8"
+                    HorizontalAlignment="Right" VerticalAlignment="Center"
+                    Margin="16,0">
+          <Button Content="Discard"  Command="{Binding DiscardCommand}"     MinWidth="80"/>
+          <Button Content="Finalize" Command="{Binding FinalizeNowCommand}" MinWidth="80"/>
+          <Button Content="Resume"   Command="{Binding ResumeCommand}"      Classes="primary" MinWidth="80"/>
+        </StackPanel>
+      </Border>
+
+    </Grid>
+  </Border>
+</Window>

src/ClaudeDo.Ui/Views/Modals/UnfinishedPlanningModalView.axaml.cs

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+using Avalonia.Controls;
+using Avalonia.Input;
+
+namespace ClaudeDo.Ui.Views.Modals;
+
+public partial class UnfinishedPlanningModalView : Window
+{
+    public UnfinishedPlanningModalView()
+    {
+        InitializeComponent();
+        DataContextChanged += (_, _) =>
+        {
+            if (DataContext is ViewModels.Modals.UnfinishedPlanningModalViewModel vm)
+                vm.CloseAction = () => Close();
+        };
+    }
+
+    private void TitleBar_PointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+            BeginMoveDrag(e);
+    }
+}