fix(worker): harden review re-run, timestamps, and queue affordance

- Clear ReviewFeedback only after a successful re-run so a failed/cancelled
  run keeps it for a manual retry.
- Clear stale StartedAt/FinishedAt when rejecting a task back to the queue.
- Only non-planning standalone tasks gate on review (guard PlanningPhase).
- Hide "send to queue" for WaitingForReview tasks so review isn't bypassed.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/ClaudeDo.Worker/State/TaskStateService.cs

@@ -134,7 +134,9 @@ public sealed class TaskStateService : ITaskStateService
             .Where(t => t.Id == taskId && t.Status == TaskStatus.WaitingForReview)
             .ExecuteUpdateAsync(s => s
                 .SetProperty(t => t.Status, TaskStatus.Queued)
-                .SetProperty(t => t.ReviewFeedback, feedback), ct);
+                .SetProperty(t => t.ReviewFeedback, feedback)
+                .SetProperty(t => t.StartedAt, (DateTime?)null)
+                .SetProperty(t => t.FinishedAt, (DateTime?)null), ct);
 
         if (affected == 0)
             return new TransitionResult(false, "Task is not waiting for review; cannot reject.");