feat(queue): warn when the base branch has uncommitted changes

Queuing (update_task_status, batch_update_task_status) and run_task_now
now surface a non-blocking baseDirty warning (separate modified/untracked
counts) when the list's working dir has uncommitted changes at enqueue
time, since a new worktree forks from the commit tip and silently misses
them. BaseDirtyChecker caches per working dir for a few seconds so a
batch queue over many tasks in one list only shells out to git once. The
UI surfaces the same warning via the footer error strip on queue actions.

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

@@ -1097,12 +1097,20 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase, IDisposable
         if (Task == null) return;
         try
         {
-            await _worker.SetTaskStatusAsync(Task.Id, ClaudeDo.Data.Models.TaskStatus.Queued);
+            var baseDirty = await _worker.SetTaskStatusAsync(Task.Id, ClaudeDo.Data.Models.TaskStatus.Queued);
             AgentState = "queued";
+            ReportBaseDirty(baseDirty);
         }
         catch { /* offline */ }
     }
 
+    private void ReportBaseDirty(BaseDirtyWarningDto? warning)
+    {
+        if (warning is null) return;
+        ErrorReported?.Invoke(Loc.T(
+            "vm.queue.baseDirtyWarning", warning.ModifiedCount, warning.UntrackedCount));
+    }
+
     private bool CanEnqueue() =>
         Task != null && _worker.IsConnected && IsIdle
         && (!Task.IsChild || Task.ParentFinalized);
@@ -1168,8 +1176,9 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase, IDisposable
 
         try
         {
-            await _worker.SetTaskStatusAsync(Task.Id, ClaudeDo.Data.Models.TaskStatus.Queued);
+            var baseDirty = await _worker.SetTaskStatusAsync(Task.Id, ClaudeDo.Data.Models.TaskStatus.Queued);
             AgentState = "queued";
+            ReportBaseDirty(baseDirty);
         }
         catch { /* offline */ }
     }