feat(tasks): mark tasks and lists as manual

Reminders written down as todos had no home: every task looked like Claude work.
A manual task now shows a MANUAL badge and hides send-to-queue, refine and the
planning session; the queue picker, daily prep and the list handler all skip it,
with a TaskStateService guard so the MCP surface and hub cannot start one either.
Opening a hand-driven ConPTY session stays available on purpose.

A list can be marked manual in its settings, which makes tasks created there
(UI and MCP add_task) start out manual. Toggle per task from its context menu.

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

@@ -427,6 +427,8 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
         if (string.IsNullOrWhiteSpace(NewTaskTitle) || _currentList?.Kind != ListKind.User) return;
         var listId = _currentList.Id["user:".Length..];
         await using var db = await _dbFactory.CreateDbContextAsync();
+        // A manual list holds reminders, so tasks created in it start out manual.
+        var listIsManual = await db.Lists.Where(l => l.Id == listId).Select(l => l.IsManual).FirstOrDefaultAsync();
         var entity = new TaskEntity
         {
             Id        = Guid.NewGuid().ToString("N"),
@@ -434,6 +436,7 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
             Title     = NewTaskTitle.Trim(),
             Status    = TaskStatus.Idle,
             CreatedAt = DateTime.UtcNow,
+            IsManual  = listIsManual,
         };
         await new TaskRepository(db).AddAsync(entity);
         var row = TaskRowViewModel.FromEntity(entity);
@@ -622,6 +625,23 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
         TasksChanged?.Invoke(this, EventArgs.Empty);
     }
 
+    /// <summary>Flips a task between "Claude can run this" and "manual reminder". A manual task
+    /// hides every hand-off affordance and is skipped by the queue picker and daily prep.</summary>
+    [RelayCommand]
+    private async Task ToggleManualAsync(TaskRowViewModel? row)
+    {
+        if (row is null) return;
+        row.IsManual = !row.IsManual;
+        await using var db = await _dbFactory.CreateDbContextAsync();
+        var entity = await db.Tasks.FirstOrDefaultAsync(t => t.Id == row.Id);
+        if (entity != null)
+        {
+            entity.IsManual = row.IsManual;
+            await db.SaveChangesAsync();
+        }
+        TasksChanged?.Invoke(this, EventArgs.Empty);
+    }
+
     [RelayCommand]
     private async Task AddToMyDayAsync(TaskRowViewModel? row)
     {