fix(ui): Worktrees-Uebersicht zeigt Task-Nummern, DIFF-Spalte trimmt statt abzuschneiden

Befund F7 aus der Sichtpruefung 2026-09-16. TaskNumber war bereits im
WorktreeMaintenanceService-Join und in WorktreeOverviewRow vorhanden, fehlte
aber im Wire-DTO und in der UI-Kette; jetzt bis zur Row-/Conflict-Anzeige
durchgereicht (#<number> dimmed vor dem Titel, ausgeblendet bei 0). DIFF-Spalte
bekommt CharacterEllipsis-Trimming + Tooltip statt hartem Cut, Spalte von 80
auf 110px verbreitert (Header und Row synchron).

src/ClaudeDo.Data/Wire.cs

@@ -72,7 +72,8 @@ public record WorktreeOverviewDto(
     WorktreeState State,
     string? DiffStat,
     DateTime CreatedAt,
-    bool PathExistsOnDisk);
+    bool PathExistsOnDisk,
+    int TaskNumber = 0);
 
 public record ForceRemoveResultDto(bool Removed, string? Reason);
 

src/ClaudeDo.Ui/ViewModels/Modals/WorktreesOverviewModalViewModel.cs

@@ -16,6 +16,7 @@ public enum BatchMergeOutcome { None, Merging, Merged, Conflict, Blocked, Verify
 public sealed partial class WorktreeOverviewRowViewModel : ViewModelBase
 {
     [ObservableProperty] private string _taskId = "";
+    [ObservableProperty] private int _taskNumber;
     [ObservableProperty] private string _taskTitle = "";
     [ObservableProperty][NotifyPropertyChangedFor(nameof(IsRunning))] private TaskStatus _taskStatus;
     [ObservableProperty] private string _listId = "";
@@ -49,6 +50,9 @@ public sealed partial class WorktreeOverviewRowViewModel : ViewModelBase
     public bool IsKept => State == WorktreeState.Kept;
     public bool IsRunning => TaskStatus == TaskStatus.Running;
 
+    // 0 = row without an allocated number (test seeds); a bare "#0" would be meaningless.
+    public bool ShowNumberBadge => TaskNumber > 0;
+
     private static string FormatAge(TimeSpan ts)
     {
         if (ts.TotalDays >= 1) return $"{(int)ts.TotalDays}d ago";
@@ -366,7 +370,7 @@ public sealed partial class WorktreesOverviewModalViewModel : ViewModelBase
 
     private static WorktreeOverviewRowViewModel Map(WorktreeOverviewDto d) => new()
     {
-        TaskId = d.TaskId, TaskTitle = d.TaskTitle, TaskStatus = d.TaskStatus,
+        TaskId = d.TaskId, TaskNumber = d.TaskNumber, TaskTitle = d.TaskTitle, TaskStatus = d.TaskStatus,
         ListId = d.ListId, ListName = d.ListName,
         Path = d.Path, BranchName = d.BranchName, BaseCommit = d.BaseCommit, State = d.State,
         DiffStat = d.DiffStat, CreatedAt = d.CreatedAt, PathExistsOnDisk = d.PathExistsOnDisk,

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

@@ -58,13 +58,18 @@
                       CommandParameter="{Binding}"/>
           </ContextMenu>
         </Border.ContextMenu>
-        <Grid ColumnDefinitions="Auto,*,90,90,80,80">
+        <Grid ColumnDefinitions="Auto,*,90,90,110,80">
           <CheckBox Grid.Column="0" VerticalAlignment="Center" Margin="0,0,8,0"
                     IsChecked="{Binding IsChecked, Mode=TwoWay}"
                     IsEnabled="{Binding IsActive}"
                     IsVisible="{Binding IsActive}"/>
           <StackPanel Grid.Column="1" Orientation="Vertical" Spacing="2">
-            <TextBlock Classes="title" Text="{Binding TaskTitle}"/>
+            <Grid ColumnDefinitions="Auto,*">
+              <TextBlock Grid.Column="0" Classes="meta" Text="{Binding TaskNumber, StringFormat='#{0}'}"
+                         IsVisible="{Binding ShowNumberBadge}"
+                         VerticalAlignment="Center" Margin="0,0,6,0"/>
+              <TextBlock Grid.Column="1" Classes="title" Text="{Binding TaskTitle}"/>
+            </Grid>
             <StackPanel Orientation="Horizontal" Spacing="4">
               <TextBlock Classes="meta" Text="{Binding TaskStatus}"/>
               <TextBlock Classes="meta" Text="•"
@@ -85,7 +90,8 @@
                   HorizontalAlignment="Left" VerticalAlignment="Center">
             <TextBlock Text="{Binding State}"/>
           </Border>
-          <TextBlock Grid.Column="4" Classes="meta" Text="{Binding DiffStat}" VerticalAlignment="Center"/>
+          <TextBlock Grid.Column="4" Classes="meta" Text="{Binding DiffStat}" VerticalAlignment="Center"
+                     TextTrimming="CharacterEllipsis" ToolTip.Tip="{Binding DiffStat}"/>
           <TextBlock Grid.Column="5" Classes="meta" Text="{Binding AgeText}" VerticalAlignment="Center"/>
         </Grid>
       </Border>
@@ -146,8 +152,11 @@
                 <ItemsControl.ItemTemplate>
                   <DataTemplate x:DataType="vm:WorktreeOverviewRowViewModel">
                     <Grid ColumnDefinitions="*,Auto" Margin="0,2">
-                      <TextBlock Grid.Column="0" Classes="meta" VerticalAlignment="Center"
+                      <StackPanel Grid.Column="0" Orientation="Horizontal" Spacing="4" VerticalAlignment="Center">
-                                 Text="{Binding TaskTitle}"/>
+                        <TextBlock Classes="meta" Text="{Binding TaskNumber, StringFormat='#{0}'}"
+                                   IsVisible="{Binding ShowNumberBadge}"/>
+                        <TextBlock Classes="meta" Text="{Binding TaskTitle}"/>
+                      </StackPanel>
                       <Button Grid.Column="1" Classes="btn"
                               Content="{loc:Tr modals.worktreesOverview.resolve}"
                               Command="{Binding $parent[Window].((vm:WorktreesOverviewModalViewModel)DataContext).ResolveConflictCommand}"
@@ -159,7 +168,7 @@
             </StackPanel>
           </Border>
           <!-- Column headers -->
-          <Grid ColumnDefinitions="Auto,*,90,90,80,80" Margin="12,0,12,4">
+          <Grid ColumnDefinitions="Auto,*,90,90,110,80" Margin="12,0,12,4">
             <TextBlock Grid.Column="1" Classes="eyebrow" Text="{loc:Tr modals.worktreesOverview.columnTask}"/>
             <TextBlock Grid.Column="2" Classes="eyebrow" Text="{loc:Tr modals.worktreesOverview.columnOutcome}"/>
             <TextBlock Grid.Column="3" Classes="eyebrow" Text="{loc:Tr modals.worktreesOverview.columnState}"/>

src/ClaudeDo.Worker/Hub/WorkerHub.cs

@@ -449,7 +449,8 @@ public sealed class WorkerHub : Microsoft.AspNetCore.SignalR.Hub
         var rows = await _wtMaintenance.GetOverviewAsync(listId, Context.ConnectionAborted);
         return rows.Select(r => new WorktreeOverviewDto(
             r.TaskId, r.TaskTitle, r.TaskStatus, r.ListId, r.ListName,
-            r.Path, r.BranchName, r.BaseCommit, r.State, r.DiffStat, r.CreatedAt, r.PathExistsOnDisk)).ToList();
+            r.Path, r.BranchName, r.BaseCommit, r.State, r.DiffStat, r.CreatedAt, r.PathExistsOnDisk,
+            r.TaskNumber)).ToList();
     }
 
     public async Task<bool> SetWorktreeState(string taskId, WorktreeState newState)

tests/ClaudeDo.Ui.Tests/ViewModels/WorktreesOverviewReconcileTickTests.cs

@@ -114,6 +114,32 @@ public class WorktreesOverviewReconcileTickTests
         Assert.Equal(1, vm.SelectedCount);
     }
 
+    [Fact]
+    public async Task Map_carries_the_task_number_and_hides_the_badge_when_zero()
+    {
+        var worker = new FakeWorker
+        {
+            Worktrees =
+            {
+                Wt("a") with { TaskNumber = 42 },
+                Wt("b") with { TaskNumber = 0 },
+            },
+        };
+        var vm = new WorktreesOverviewModalViewModel(
+            worker, () => throw new InvalidOperationException("no diff vm in this test"),
+            new ClaudeDo.Ui.Services.MergeCoordinator());
+        vm.Configure("L1", "Work");
+        await vm.LoadAsync();
+
+        var withNumber = vm.Rows.Single(r => r.TaskId == "a");
+        var withoutNumber = vm.Rows.Single(r => r.TaskId == "b");
+
+        Assert.Equal(42, withNumber.TaskNumber);
+        Assert.True(withNumber.ShowNumberBadge);
+        Assert.Equal(0, withoutNumber.TaskNumber);
+        Assert.False(withoutNumber.ShowNumberBadge);
+    }
+
     [Theory]
     [InlineData("refresh")]
     [InlineData("cleanup")]