feat(ui): editable task status and tags from details panel

Adds a status ComboBox in the Details header (no transition guards)
and a Tags section with chips + AutoCompleteBox. TaskRowViewModel.Tags
becomes an ObservableCollection so chip lists stay live. TasksIsland
caches AllTags for the row context menu and exposes Set/Toggle helpers.
Test fakes updated for the new IWorkerClient methods.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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

@@ -28,6 +28,7 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
     public ObservableCollection<TaskRowViewModel> OverdueItems { get; } = new();
     public ObservableCollection<TaskRowViewModel> OpenItems { get; } = new();
     public ObservableCollection<TaskRowViewModel> CompletedItems { get; } = new();
+    public ObservableCollection<string> AllTags { get; } = new();
 
     [ObservableProperty] private string _newTaskTitle = "";
     [ObservableProperty] private TaskRowViewModel? _selectedTask;
@@ -54,9 +55,22 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
             _worker.TaskUpdatedEvent     += OnWorkerTaskUpdated;
             _worker.WorktreeUpdatedEvent += OnWorkerTaskUpdated;
             _worker.TaskMessageEvent     += OnWorkerTaskMessage;
+            _ = RefreshAllTagsAsync();
         }
     }
 
+    private async Task RefreshAllTagsAsync()
+    {
+        if (_worker is null) return;
+        try
+        {
+            var tags = await _worker.GetAllTagsAsync();
+            AllTags.Clear();
+            foreach (var t in tags) AllTags.Add(t);
+        }
+        catch { /* offline */ }
+    }
+
     private void OnWorkerTaskMessage(string taskId, string line)
     {
         var row = Items.FirstOrDefault(r => r.Id == taskId);
@@ -83,6 +97,7 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
             var entity = await db.Tasks
                 .Include(t => t.List)
                 .Include(t => t.Worktree)
+                .Include(t => t.Tags)
                 .FirstOrDefaultAsync(t => t.Id == taskId);
 
             var existing = Items.FirstOrDefault(r => r.Id == taskId);
@@ -171,6 +186,7 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
             var all = await db.Tasks
                 .Include(t => t.List)
                 .Include(t => t.Worktree)
+                .Include(t => t.Tags)
                 .OrderBy(t => t.SortOrder).ThenBy(t => t.CreatedAt)
                 .ToListAsync(ct);
 
@@ -462,6 +478,30 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
         TasksChanged?.Invoke(this, EventArgs.Empty);
     }
 
+    public async Task SetStatusOnRowAsync(TaskRowViewModel row, TaskStatus status)
+    {
+        if (_worker is null) return;
+        try { await _worker.SetTaskStatusAsync(row.Id, status); }
+        catch { /* offline; broadcast won't fire */ }
+    }
+
+    public async Task ToggleTagOnRowAsync(TaskRowViewModel row, string tagName)
+    {
+        if (_worker is null) return;
+        var name = tagName.Trim().ToLowerInvariant();
+        if (name.Length == 0) return;
+        var current = row.Tags.ToList();
+        var next = current.Contains(name)
+            ? current.Where(t => t != name).ToList()
+            : current.Append(name).ToList();
+        try
+        {
+            await _worker.SetTaskTagsAsync(row.Id, next);
+            await RefreshAllTagsAsync();
+        }
+        catch { }
+    }
+
     [RelayCommand]
     private async Task SendToQueueAsync(TaskRowViewModel? row)
     {