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/Modals/ListSettingsModalViewModel.cs

@@ -28,6 +28,8 @@ public sealed partial class ListSettingsModalViewModel : ViewModelBase
     [ObservableProperty] private string _name = "";
     [ObservableProperty] private string _workingDir = "";
     [ObservableProperty] private string _defaultCommitType = CommitTypeRegistry.DefaultType;
+    // A manual list holds reminders: tasks created here start out manual (TaskEntity.IsManual).
+    [ObservableProperty] private bool _isManual;
 
     public ObservableCollection<string> CommitTypeOptions { get; } = new(CommitTypeRegistry.Types);
 
@@ -49,10 +51,12 @@ public sealed partial class ListSettingsModalViewModel : ViewModelBase
         string name,
         string? workingDir,
         string defaultCommitType,
+        bool isManual = false,
         CancellationToken ct = default)
     {
         ListId = listId;
         Name = name;
+        IsManual = isManual;
         WorkingDir = workingDir ?? "";
         DefaultCommitType = string.IsNullOrWhiteSpace(defaultCommitType) ? CommitTypeRegistry.DefaultType : defaultCommitType;
 
@@ -66,7 +70,8 @@ public sealed partial class ListSettingsModalViewModel : ViewModelBase
             ListId,
             string.IsNullOrWhiteSpace(Name) ? Loc.T("vm.listSettings.untitled") : Name,
             string.IsNullOrWhiteSpace(WorkingDir) ? null : WorkingDir,
-            DefaultCommitType));
+            DefaultCommitType,
+            IsManual));
 
         await Agent.SaveAsync();