fix(log-center): ES 时间戳双字段兼容 + AI助手按钮去重清理

frontend/src/components/approval/helpers.tsx

@@ -117,6 +117,16 @@ export function renderStepProgress(instance: JsonData) {
               {isRejected && <XCircle className="h-3 w-3" />}
               {isCurrent && !isRejected && <Loader2 className="h-3 w-3 animate-spin" />}
               <span>{step.name || step.approver_name || `步骤 ${index + 1}`}</span>
+              {step.step_type && step.step_type !== 'submit' && (
+                <span className={cn(
+                  'text-[10px] px-1 py-0 rounded',
+                  step.step_type === 'execute' 
+                    ? 'bg-green-500/15 text-green-400' 
+                    : 'bg-purple-500/15 text-purple-400'
+                )}>
+                  {step.step_type === 'execute' ? '执行' : '审核'}
+                </span>
+              )}
             </div>
             {index < steps.length - 1 && (
               <div className={cn('w-4 h-px', isCompleted ? 'bg-emerald-500/30' : 'bg-[var(--dg-border)]')} />