Method UpdateSubtask

backend/Controllers/TasksController.cs:147–167

(int subtaskId, [FromBody] UpdateSubtaskDto dto)

    }

    [HttpPut("subtasks/{subtaskId}")]
    public async Task<IActionResult> UpdateSubtask(int subtaskId, [FromBody] UpdateSubtaskDto dto)
    {
        try
        {
            int userId = GetUserId();
            var subtask = await _taskService.UpdateSubtaskAsync(subtaskId, dto, userId);
            if (subtask == null) return NotFound();

            // Get Task to notify
            var task = await _taskService.GetTaskByIdAsync(subtask.TaskCardId, userId);
            if (task != null)
            {
                await _hubContext.Clients.Group($"board_{task.BoardId}")
                    .SendAsync("TaskUpdated", task);
            }

            return Ok(subtask);
        }
        catch (UnauthorizedAccessException) { return Forbid(); }
    }

    [HttpDelete("subtasks/{subtaskId}")]
    public async Task<IActionResult> DeleteSubtask(int subtaskId)