feat(ui): surface agent roadblocks and run outcome in the detail pane

- Parse CLAUDEDO_BLOCKED roadblocks out of the run result and show them in a
  colored card between Details and Output (ApplyOutcome / ShowRoadblockCard).
- Show the run outcome summary as an OUTCOME card in the Output tab, loaded from
  the task result (falls back to the run's ErrorMarkdown) and refreshed on finish.
- Guard the Session tab so it only appears when there are child outcomes.
- Make console resize per-task and proportional (description capped at 2/3,
  console floored at ~1/3) so a long description no longer spills over the footer.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/ClaudeDo.Ui/ViewModels/Islands/DetailsIslandViewModel.cs

@@ -62,14 +62,6 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase
     partial void OnIsNotesModeChanged(bool value) => OnPropertyChanged(nameof(IsTaskDetailVisible));
     partial void OnIsPrepModeChanged(bool value) => OnPropertyChanged(nameof(IsTaskDetailVisible));
 
-    // Console maximize: green dot shrinks the description row to its MinHeight so
-    // the WorkConsole fills the rest. The row stays draggable and never overlaps.
-    // Applied in DetailsIslandView code-behind (RowDefinitions can't bind).
-    [ObservableProperty] private bool _isConsoleMaximized;
-
-    [RelayCommand]
-    private void ToggleConsoleMaximized() => IsConsoleMaximized = !IsConsoleMaximized;
-
     public NotesEditorViewModel Notes { get; private set; } = null!;
 
     // Current task row (set by IslandsShellViewModel via Bind)
@@ -161,14 +153,15 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase
     public bool ShowMergeSection =>
         WorktreePath != null || Task?.IsPlanningParent == true || HasChildOutcomes;
 
-    // Nothing to manage yet (idle/queued/running standalone): show a hint.
-    public bool ShowSessionEmpty =>
-        !IsWaitingForReview && !ShowMergeSection && !HasChildOutcomes;
-
     private void NotifySessionSections()
     {
+        OnPropertyChanged(nameof(HasChildOutcomes));
         OnPropertyChanged(nameof(ShowMergeSection));
-        OnPropertyChanged(nameof(ShowSessionEmpty));
+
+        // The Session tab is only visible when it has outcomes; if it just
+        // emptied while selected, fall back to Output so the body isn't blank.
+        if (!HasChildOutcomes && SelectedTab == "session")
+            SelectedTab = "output";
     }
 
     public string TurnsText   => $"{Turns}/{EffectiveMaxTurns}";
@@ -184,6 +177,53 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase
         IsFailed ? "The session ended with an error." :
         IsCancelled ? "The session was cancelled." : "";
 
+    // The session's outcome summary — the task's Result minus any roadblock
+    // section (those get their own card), falling back to the run's
+    // ErrorMarkdown for hard failures. Shown once a run has finished.
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(ShowSessionOutcome))]
+    private string? _sessionOutcome;
+
+    public bool ShowSessionOutcome =>
+        !string.IsNullOrWhiteSpace(SessionOutcome)
+        && (IsWaitingForReview || IsDone || IsFailed || IsCancelled);
+
+    // The roadblocks the agent emitted (CLAUDEDO_BLOCKED), parsed out of the
+    // run result so they can surface as a distinct colored card.
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(ShowRoadblockCard))]
+    private string? _roadblocks;
+
+    public bool ShowRoadblockCard =>
+        !string.IsNullOrWhiteSpace(Roadblocks)
+        && (IsWaitingForReview || IsDone || IsFailed || IsCancelled);
+
+    // Worker writes roadblocks into the result under this header
+    // (TaskRunner.ComposeReviewResult). Split it back out for display.
+    private const string RoadblockMarker = "Roadblocks reported during the run:";
+
+    private void ApplyOutcome(string? result, string? errorFallback)
+    {
+        if (string.IsNullOrWhiteSpace(result))
+        {
+            SessionOutcome = errorFallback;
+            Roadblocks = null;
+            return;
+        }
+
+        var idx = result.IndexOf(RoadblockMarker, StringComparison.Ordinal);
+        if (idx < 0)
+        {
+            SessionOutcome = result;
+            Roadblocks = null;
+            return;
+        }
+
+        var summary = result[..idx].TrimEnd().TrimEnd('⚠').TrimEnd();
+        SessionOutcome = string.IsNullOrWhiteSpace(summary) ? null : summary;
+        Roadblocks = result[(idx + RoadblockMarker.Length)..].Trim();
+    }
+
     public string SessionLabel => "claude-session";
 
     // Short task-id badge, e.g. "#T1A"
@@ -230,6 +270,8 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase
         OnPropertyChanged(nameof(IsAgentSectionEnabled));
         OnPropertyChanged(nameof(ShowRoadblock));
         OnPropertyChanged(nameof(RoadblockMessage));
+        OnPropertyChanged(nameof(ShowSessionOutcome));
+        OnPropertyChanged(nameof(ShowRoadblockCard));
         NotifySessionSections();
     }
     [ObservableProperty] private string? _model;
@@ -364,9 +406,6 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase
     public bool ShowMergePreviewMuted =>
         !MergeIsClean && !MergeIsConflict && !string.IsNullOrEmpty(MergePreviewText);
 
-    public bool ShowSingleMerge =>
-        WorktreePath != null && Task?.IsPlanningParent != true;
-
     // Claude CLI stream-json parser + buffer for partial text deltas
     private readonly StreamLineFormatter _formatter = new();
     private readonly StringBuilder _claudeBuf = new();
@@ -439,6 +478,21 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase
         catch { }
     }
 
+    // Reload the session outcome (task Result incl. roadblocks, or the run's
+    // error) so it appears as soon as a run finishes.
+    private async System.Threading.Tasks.Task RefreshOutcomeAsync(string taskId)
+    {
+        try
+        {
+            await using var ctx = await _dbFactory.CreateDbContextAsync();
+            var entity = await ctx.Tasks.AsNoTracking().FirstOrDefaultAsync(t => t.Id == taskId);
+            var latestRun = await new TaskRunRepository(ctx).GetLatestByTaskIdAsync(taskId);
+            if (Task?.Id != taskId) return;
+            ApplyOutcome(entity?.Result, latestRun?.ErrorMarkdown);
+        }
+        catch { }
+    }
+
     public DetailsIslandViewModel(IDbContextFactory<ClaudeDoDbContext> dbFactory, IWorkerClient worker, IServiceProvider services, INotesApi notesApi)
     {
         _dbFactory = dbFactory;
@@ -492,6 +546,7 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase
             // Re-query to pick up worktree created during the run.
             _ = RefreshWorktreeAsync(taskId);
             _ = RefreshChildOutcomeAsync(taskId);
+            _ = RefreshOutcomeAsync(taskId);
         };
 
         _worker.WorktreeUpdatedEvent += taskId =>
@@ -755,6 +810,8 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase
         CanMergeAll = false;
         MergeAllDisabledReason = null;
         MergeAllError = null;
+        SessionOutcome = null;
+        Roadblocks = null;
         _claudeBuf.Clear();
 
         if (row == null)
@@ -824,6 +881,7 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase
             var latestRun = await runRepo.GetLatestByTaskIdAsync(row.Id, ct);
             ct.ThrowIfCancellationRequested();
             LatestRunSessionId = latestRun?.SessionId;
+            ApplyOutcome(entity.Result, latestRun?.ErrorMarkdown);
 
             // Subscribe only after DB load confirms the task exists
             _subscribedTaskId = row.Id;
@@ -1170,34 +1228,6 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase
         MergePreviewText = text; MergeIsClean = clean; MergeIsConflict = conflict;
     }
 
-    [RelayCommand]
-    private async System.Threading.Tasks.Task MergeAsync()
-    {
-        if (Task is null || WorktreePath is null || !_worker.IsConnected) return;
-        try
-        {
-            var result = await _worker.MergeTaskAsync(Task.Id, SelectedMergeTarget ?? "", false, "Merge task");
-            if (result.Status == "conflict")
-            {
-                if (RequestConflictResolution is not null)
-                {
-                    await RequestConflictResolution(Task.Id, SelectedMergeTarget ?? "");
-                }
-                else
-                {
-                    var (text, _, _) = MergePreviewPresenter.Describe(
-                        new MergePreviewDto("conflict", result.ConflictFiles, 0));
-                    MergePreviewText = text; MergeIsClean = false; MergeIsConflict = true;
-                }
-            }
-            else
-            {
-                await RefreshMergePreviewAsync();
-            }
-        }
-        catch { /* broadcast reconciles */ }
-    }
-
     [RelayCommand(CanExecute = nameof(CanOpenDiff))]
     private async System.Threading.Tasks.Task OpenDiffAsync()
     {
@@ -1244,7 +1274,6 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase
         OpenDiffCommand.NotifyCanExecuteChanged();
         OpenWorktreeCommand.NotifyCanExecuteChanged();
         NotifySessionSections();
-        OnPropertyChanged(nameof(ShowSingleMerge));
     }
 
     partial void OnTaskChanged(TaskRowViewModel? value) => NotifySessionSections();

src/ClaudeDo.Ui/Views/Islands/Detail/DescriptionStepsCard.axaml

@@ -2,6 +2,7 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:vm="using:ClaudeDo.Ui.ViewModels.Islands"
              xmlns:ctl="using:ClaudeDo.Ui.Views.Controls"
+             xmlns:loc="using:ClaudeDo.Ui.Localization"
              x:Class="ClaudeDo.Ui.Views.Islands.Detail.DescriptionStepsCard"
              x:DataType="vm:DetailsIslandViewModel">
 
@@ -21,7 +22,7 @@
           <Button Grid.Column="2"
                   Classes="icon-btn"
                   Margin="0,0,4,0"
-                  ToolTip.Tip="Copy formatted (title + description + open steps)"
+                  ToolTip.Tip="{loc:Tr details.copyFormattedTip}"
                   Click="OnCopyClick">
             <PathIcon Data="{StaticResource Icon.Copy}" Width="11" Height="11"/>
           </Button>
@@ -30,6 +31,7 @@
           <Button Grid.Column="3"
                   Classes="btn"
                   Padding="8,3"
+                  ToolTip.Tip="{loc:Tr details.toggleEditPreviewTip}"
                   Command="{Binding ToggleEditDescriptionCommand}">
             <Panel>
               <TextBlock Text="Preview" IsVisible="{Binding IsEditingDescription}"/>
@@ -40,7 +42,8 @@
         </Grid>
       </Border>
 
-      <!-- Body -->
+      <!-- Body (scrolls inside the card so the card fills its row to the divider) -->
+      <ScrollViewer VerticalScrollBarVisibility="Auto">
       <StackPanel Margin="14" Spacing="10">
 
         <!-- Description (always visible) -->
@@ -159,6 +162,7 @@
         </Border>
 
       </StackPanel>
+      </ScrollViewer>
     </DockPanel>
   </Border>
 

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

@@ -72,22 +72,12 @@
       <Grid DockPanel.Dock="Top" ColumnDefinitions="Auto,*,Auto"
             Background="{DynamicResource Surface2Brush}" Height="28">
 
-        <!-- Traffic-light dots; green toggles console maximize -->
+        <!-- Traffic-light dots (decorative) -->
         <StackPanel Grid.Column="0" Orientation="Horizontal" Spacing="6"
                     Margin="12,0" VerticalAlignment="Center">
           <Ellipse Classes="dot-red" />
           <Ellipse Classes="dot-yellow" />
-          <Button Classes="dot-btn"
-                  Command="{Binding ToggleConsoleMaximizedCommand}"
-                  ToolTip.Tip="{loc:Tr console.maximizeTip}">
-            <Panel>
-              <Ellipse Classes="dot-green" />
-              <PathIcon Data="{StaticResource Icon.ArrowOut}"
-                        Width="6" Height="6"
-                        Foreground="{DynamicResource MossBrightBrush}"
-                        HorizontalAlignment="Center" VerticalAlignment="Center" />
-            </Panel>
-          </Button>
+          <Ellipse Classes="dot-green" />
         </StackPanel>
 
         <!-- Right cluster: info header (model · turns · diff) + status chip -->
@@ -183,6 +173,7 @@
           <Button Classes="tab-btn"
                   Classes.active="{Binding IsSessionTab}"
                   Content="Session"
+                  IsVisible="{Binding HasChildOutcomes}"
                   Command="{Binding SelectTabCommand}"
                   CommandParameter="session" />
         </StackPanel>
@@ -194,6 +185,26 @@
         <!-- Output: log + review footer, both gated on IsOutputTab -->
         <DockPanel IsVisible="{Binding IsOutputTab}" LastChildFill="True">
 
+          <!-- Session outcome: the run's result summary, incl. any roadblocks
+               reported (or the error for a hard failure). -->
+          <Border DockPanel.Dock="Top"
+                  Margin="12,8,12,4" Padding="10,8"
+                  IsVisible="{Binding ShowSessionOutcome}"
+                  Background="{DynamicResource Surface2Brush}"
+                  BorderBrush="{DynamicResource LineBrush}"
+                  BorderThickness="1" CornerRadius="8">
+            <StackPanel Spacing="6">
+              <TextBlock Classes="section-label" Text="OUTCOME" />
+              <ScrollViewer MaxHeight="160" VerticalScrollBarVisibility="Auto">
+                <SelectableTextBlock Text="{Binding SessionOutcome}"
+                                     TextWrapping="Wrap"
+                                     Foreground="{DynamicResource TextDimBrush}"
+                                     FontFamily="{StaticResource MonoFont}"
+                                     FontSize="{StaticResource FontSizeMono}" />
+              </ScrollViewer>
+            </StackPanel>
+          </Border>
+
           <!-- Review prompt — sits directly on the terminal, like a shell input line;
                only while awaiting review. No border/fill so it reads as part of the log. -->
           <Grid DockPanel.Dock="Bottom"
@@ -222,8 +233,10 @@
             <StackPanel Grid.Column="2" Orientation="Horizontal" Spacing="10"
                         VerticalAlignment="Top" Margin="12,2,0,0">
               <Button Classes="prompt-action accent" Content="[Continue]"
+                      ToolTip.Tip="{loc:Tr session.reviewContinueTip}"
                       Command="{Binding RejectReviewCommand}" />
               <Button Classes="prompt-action" Content="[Reset]"
+                      ToolTip.Tip="{loc:Tr session.reviewResetTip}"
                       Command="{Binding ResetReviewCommand}" />
             </StackPanel>
           </Grid>
@@ -275,19 +288,15 @@
                          IsVisible="{Binding ShowMergePreviewMuted}" />
             </StackPanel>
 
-            <!-- Primary action: Approve flows straight into the merge.
-                 Approve is the review-gated path; the plain Merge button covers
-                 already-reviewed / kept worktrees. -->
+            <!-- Primary action: Approve flows straight into the merge. -->
             <WrapPanel Orientation="Horizontal">
               <Button Classes="btn accent" Content="Approve &amp; Merge" Margin="0,0,8,8"
                       Command="{Binding ApproveReviewCommand}"
                       IsVisible="{Binding IsWaitingForReview}" />
-              <Button Classes="btn accent" Content="Merge" Margin="0,0,8,8"
-                      Command="{Binding MergeCommand}"
-                      IsVisible="{Binding ShowSingleMerge}" />
               <Button Classes="btn" Content="Open Diff" Margin="0,0,8,8"
                       Command="{Binding OpenDiffCommand}" />
               <Button Classes="btn" Margin="0,0,8,8"
+                      ToolTip.Tip="{loc:Tr agent.openWorktreeTip}"
                       Command="{Binding OpenWorktreeCommand}">
                 <StackPanel Orientation="Horizontal" Spacing="5">
                   <TextBlock Text="Worktree" />
@@ -336,13 +345,6 @@
               </ItemsControl>
             </StackPanel>
 
-            <!-- Empty state: nothing to manage yet -->
-            <TextBlock IsVisible="{Binding ShowSessionEmpty}"
-                       Classes="meta"
-                       Foreground="{DynamicResource TextMuteBrush}"
-                       TextWrapping="Wrap"
-                       Text="Nothing to manage yet — subtask outcomes appear here once the run finishes. Review in the Output tab, merge in the Git tab." />
-
           </StackPanel>
         </ScrollViewer>
 

src/ClaudeDo.Ui/Views/Islands/DetailsIslandView.axaml

@@ -43,24 +43,55 @@
             IsVisible="{Binding IsTaskDetailVisible}"
             Margin="14,12,14,12">
         <Grid.RowDefinitions>
-          <!-- MinHeight keeps the description visible: the console can never
-               overlap it, whether maximized (code-behind) or dragged. -->
-          <RowDefinition Height="2*" MinHeight="90"/>
+          <!-- Auto: the description sizes to its content so the console takes
+               every spare pixel when it's short. Row limits are proportional
+               and set in code-behind (UpdateRowLimits): the description row is
+               capped at 2/3 of the island and the console row floored at 1/3,
+               so the console can be dragged down to (but not below) 1/3 and a
+               long description never spills over the footer. -->
+          <RowDefinition Height="Auto" MinHeight="90"/>
           <RowDefinition Height="*"/>
         </Grid.RowDefinitions>
-        <ScrollViewer Grid.Row="0" VerticalScrollBarVisibility="Auto">
-          <detail:DescriptionStepsCard VerticalAlignment="Top"/>
-        </ScrollViewer>
-        <detail:WorkConsole Grid.Row="1" Margin="0,10,0,0"/>
+        <detail:DescriptionStepsCard x:Name="DescriptionCard" Grid.Row="0"/>
+
+        <!-- Console row also hosts the roadblock card (docked above the console)
+             so it surfaces at a glance between Details and Output. Keeping it
+             inside row 1 leaves the desc/console resize model untouched. -->
+        <DockPanel Grid.Row="1" Margin="0,10,0,0">
+          <Border DockPanel.Dock="Top"
+                  IsVisible="{Binding ShowRoadblockCard}"
+                  Margin="0,0,0,10" Padding="12,10"
+                  Background="{DynamicResource ReviewTintBrush}"
+                  BorderBrush="{DynamicResource ReviewTintBorderBrush}"
+                  BorderThickness="1" CornerRadius="10">
+            <StackPanel Spacing="6">
+              <StackPanel Orientation="Horizontal" Spacing="8">
+                <PathIcon Data="{StaticResource Icon.Warning}"
+                          Foreground="{DynamicResource StatusReviewBrush}"
+                          Width="14" Height="14" VerticalAlignment="Center"/>
+                <TextBlock Classes="section-label" Text="ROADBLOCK"
+                           Foreground="{DynamicResource StatusReviewBrush}"
+                           VerticalAlignment="Center"/>
+              </StackPanel>
+              <SelectableTextBlock Text="{Binding Roadblocks}"
+                                   TextWrapping="Wrap"
+                                   Foreground="{DynamicResource TextDimBrush}"/>
+            </StackPanel>
+          </Border>
+          <detail:WorkConsole/>
+        </DockPanel>
+
         <!-- Resize by dragging the console's top edge — a transparent splitter
              over the gap above the console; no standalone separator bar.
              Stays draggable while maximized. -->
-        <GridSplitter Grid.Row="1"
+        <GridSplitter x:Name="DetailSplitter" Grid.Row="1"
                       VerticalAlignment="Top"
                       Height="10"
                       HorizontalAlignment="Stretch"
                       ResizeDirection="Rows"
-                      Background="Transparent"/>
+                      Background="Transparent"
+                      DragStarted="OnSplitterDragStarted"
+                      DragCompleted="OnSplitterDragCompleted"/>
       </Grid>
 
       <!-- Notes mode -->

src/ClaudeDo.Ui/Views/Islands/DetailsIslandView.axaml.cs

@@ -1,8 +1,9 @@
-using System.ComponentModel;
 using Avalonia;
 using Avalonia.Controls;
+using Avalonia.Input;
 using Avalonia.Layout;
 using Avalonia.Media;
+using Avalonia.Reactive;
 using ClaudeDo.Ui.ViewModels.Islands;
 using ClaudeDo.Ui.Views.Modals;
 using ClaudeDo.Ui.Views.Planning;
@@ -11,27 +12,42 @@ namespace ClaudeDo.Ui.Views.Islands;
 
 public partial class DetailsIslandView : UserControl
 {
-    private DetailsIslandViewModel? _subscribedVm;
+    // Per-task description height (pixels) once the user drags the splitter.
+    // Keyed by task id so each task keeps its own resize; tasks that were
+    // never dragged stay dynamic (Auto-sized description).
+    private readonly Dictionary<string, double> _descriptionHeights = new();
+    private DetailsIslandViewModel? _vm;
 
     public DetailsIslandView()
     {
         InitializeComponent();
         DataContextChanged += OnDataContextChanged;
+        // Keep the row limits proportional to the island height: description
+        // capped at 2/3, console floored at 1/3. The GridSplitter honours these
+        // row Min/Max during a drag, so the console stops shrinking at 1/3.
+        DetailBodyGrid.GetObservable(BoundsProperty)
+            .Subscribe(new AnonymousObserver<Rect>(_ => UpdateRowLimits()));
+    }
+
+    private void UpdateRowLimits()
+    {
+        var h = DetailBodyGrid.Bounds.Height;
+        if (h <= 0) return;
+        DetailBodyGrid.RowDefinitions[0].MaxHeight = h * 2.0 / 3.0;
+        DetailBodyGrid.RowDefinitions[1].MinHeight = h / 3.0;
     }
 
     private void OnDataContextChanged(object? sender, EventArgs e)
     {
-        if (_subscribedVm is not null)
-            _subscribedVm.PropertyChanged -= OnVmPropertyChanged;
-        _subscribedVm = DataContext as DetailsIslandViewModel;
-        if (_subscribedVm is not null)
-        {
-            _subscribedVm.PropertyChanged += OnVmPropertyChanged;
-            ApplyConsoleMaximized(_subscribedVm.IsConsoleMaximized);
-        }
+        if (_vm != null)
+            _vm.PropertyChanged -= OnViewModelPropertyChanged;
 
         if (DataContext is DetailsIslandViewModel vm)
         {
+            _vm = vm;
+            vm.PropertyChanged += OnViewModelPropertyChanged;
+            ApplyResizeStateForCurrentTask();
+
             vm.ShowDiffModal = async (diffVm) =>
             {
                 var owner = TopLevel.GetTopLevel(this) as Window;
@@ -61,22 +77,39 @@ public partial class DetailsIslandView : UserControl
         }
     }
 
-    private void OnVmPropertyChanged(object? sender, PropertyChangedEventArgs e)
+    // Restores the resize state for the currently-selected task: a task the
+    // user has dragged before gets its pinned pixel height (cap lifted); a task
+    // never dragged falls back to dynamic sizing (Auto row + the bound cap).
+    private void OnViewModelPropertyChanged(object? sender, System.ComponentModel.PropertyChangedEventArgs e)
     {
-        if (e.PropertyName == nameof(DetailsIslandViewModel.IsConsoleMaximized)
-            && sender is DetailsIslandViewModel vm)
-            ApplyConsoleMaximized(vm.IsConsoleMaximized);
+        if (e.PropertyName == nameof(DetailsIslandViewModel.Task))
+            ApplyResizeStateForCurrentTask();
     }
 
-    // Maximized: shrink the description row to its MinHeight (the console fills
-    // the rest). Restored: back to the 2:1 default. The GridSplitter keeps both
-    // states draggable; MinHeight stops the console from ever covering it.
-    private void ApplyConsoleMaximized(bool maximized)
+    private void ApplyResizeStateForCurrentTask()
+    {
+        // A task dragged before keeps its pixel height (clamped by the row's
+        // 2/3 MaxHeight); a task never dragged stays Auto-sized.
+        DetailBodyGrid.RowDefinitions[0].Height = _vm?.Task?.Id is string id && _descriptionHeights.TryGetValue(id, out var h)
+            ? new GridLength(h, GridUnitType.Pixel)
+            : GridLength.Auto;
+    }
+
+    // Pin the (until now Auto-sized) description row to its current pixel
+    // height so the splitter resizes smoothly from there.
+    private void OnSplitterDragStarted(object? sender, VectorEventArgs e)
     {
         var descRow = DetailBodyGrid.RowDefinitions[0];
-        descRow.Height = maximized
-            ? new GridLength(descRow.MinHeight, GridUnitType.Pixel)
-            : new GridLength(2, GridUnitType.Star);
+        if (descRow.Height.IsAuto)
+            descRow.Height = new GridLength(DescriptionCard.Bounds.Height, GridUnitType.Pixel);
+    }
+
+    // Remember the dragged height for this task so switching tasks keeps each
+    // task's resize independent.
+    private void OnSplitterDragCompleted(object? sender, VectorEventArgs e)
+    {
+        if (_vm?.Task?.Id is string id)
+            _descriptionHeights[id] = DetailBodyGrid.RowDefinitions[0].Height.Value;
     }
 
     private async System.Threading.Tasks.Task ShowErrorDialogAsync(string message)