feat: last run frontend (#21369)

The frontend of feat: Persist Variables for Enhanced Debugging Workflow (#20699).

Co-authored-by: jZonG <jzongcode@gmail.com>

web/app/components/workflow/variable-inspect/empty.tsx

@@ -0,0 +1,28 @@
+import type { FC } from 'react'
+import { useTranslation } from 'react-i18next'
+import { Variable02 } from '@/app/components/base/icons/src/vender/solid/development'
+
+const Empty: FC = () => {
+  const { t } = useTranslation()
+
+  return (
+    <div className='flex h-full flex-col gap-3 rounded-xl bg-background-section p-8'>
+      <div className='flex h-10 w-10 items-center justify-center rounded-[10px] border-[0.5px] border-components-card-border bg-components-card-bg shadow-lg backdrop-blur-sm'>
+        <Variable02 className='h-5 w-5 text-text-accent' />
+      </div>
+      <div className='flex flex-col gap-1'>
+        <div className='system-sm-semibold text-text-secondary'>{t('workflow.debug.variableInspect.title')}</div>
+        <div className='system-xs-regular text-text-tertiary'>{t('workflow.debug.variableInspect.emptyTip')}</div>
+        <a
+          className='system-xs-regular cursor-pointer text-text-accent'
+          href='https://docs.dify.ai/guides/workflow/debug-and-preview/variable-inspect'
+          target='_blank'
+          rel='noopener noreferrer'>
+            {t('workflow.debug.variableInspect.emptyLink')}
+        </a>
+      </div>
+    </div>
+  )
+}
+
+export default Empty