Allow working on a flow even when the initial task is done

[semanser]

It should be possible to do a continuous prompting after the initial task is done. This would be useful when the user isn't satisfied with the results or wants to make some improvements.

This code probably needs to be modified:

codel/backend/executor/queue.go

Lines 231 to 248 in 13909b8

	func processDoneTask(db *database.Queries, task database.Task) error {
	flow, err := db.UpdateFlowStatus(context.Background(), database.UpdateFlowStatusParams{
	ID: task.FlowID.Int64,
	Status: database.StringToPgText("finished"),
	})
	if err != nil {
	return fmt.Errorf("failed to update task status: %w", err)
	}
	subscriptions.BroadcastFlowUpdated(task.FlowID.Int64, &gmodel.Flow{
	ID: uint(flow.ID),
	Status: gmodel.FlowStatus("finished"),
	Terminal: &gmodel.Terminal{},
	})
	return nil
	}

[borthdor]

Please add that, would change a lot!