Feature/newnew workflow loop node (#14863)

Co-authored-by: arkunzz <4873204@qq.com>

web/app/components/workflow/nodes/loop-start/constants.ts

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+export const CUSTOM_LOOP_START_NODE = 'custom-loop-start'

web/app/components/workflow/nodes/loop-start/default.ts

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+import type { NodeDefault } from '../../types'
+import type { LoopStartNodeType } from './types'
+import { ALL_CHAT_AVAILABLE_BLOCKS, ALL_COMPLETION_AVAILABLE_BLOCKS } from '@/app/components/workflow/blocks'
+
+const nodeDefault: NodeDefault<LoopStartNodeType> = {
+  defaultValue: {},
+  getAvailablePrevNodes() {
+    return []
+  },
+  getAvailableNextNodes(isChatMode: boolean) {
+    const nodes = isChatMode ? ALL_CHAT_AVAILABLE_BLOCKS : ALL_COMPLETION_AVAILABLE_BLOCKS
+    return nodes
+  },
+  checkValid() {
+    return {
+      isValid: true,
+    }
+  },
+}
+
+export default nodeDefault

web/app/components/workflow/nodes/loop-start/index.tsx

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+import { memo } from 'react'
+import { useTranslation } from 'react-i18next'
+import type { NodeProps } from 'reactflow'
+import { RiHome5Fill } from '@remixicon/react'
+import Tooltip from '@/app/components/base/tooltip'
+import { NodeSourceHandle } from '@/app/components/workflow/nodes/_base/components/node-handle'
+
+const LoopStartNode = ({ id, data }: NodeProps) => {
+  const { t } = useTranslation()
+
+  return (
+    <div className='group flex nodrag items-center justify-center w-11 h-11 mt-1 rounded-2xl border border-workflow-block-border bg-white'>
+      <Tooltip popupContent={t('workflow.blocks.loop-start')} asChild={false}>
+        <div className='flex items-center justify-center w-6 h-6 rounded-full border-[0.5px] border-components-panel-border-subtle bg-util-colors-blue-brand-blue-brand-500'>
+          <RiHome5Fill className='w-3 h-3 text-text-primary-on-surface' />
+        </div>
+      </Tooltip>
+      <NodeSourceHandle
+        id={id}
+        data={data}
+        handleClassName='!top-1/2 !-right-[9px] !-translate-y-1/2'
+        handleId='source'
+      />
+    </div>
+  )
+}
+
+export const LoopStartNodeDumb = () => {
+  const { t } = useTranslation()
+
+  return (
+    <div className='relative left-[17px] top-[21px] flex nodrag items-center justify-center w-11 h-11 rounded-2xl border border-workflow-block-border bg-white z-[11]'>
+      <Tooltip popupContent={t('workflow.blocks.loop-start')} asChild={false}>
+        <div className='flex items-center justify-center w-6 h-6 rounded-full border-[0.5px] border-components-panel-border-subtle bg-util-colors-blue-brand-blue-brand-500'>
+          <RiHome5Fill className='w-3 h-3 text-text-primary-on-surface' />
+        </div>
+      </Tooltip>
+    </div>
+  )
+}
+
+export default memo(LoopStartNode)

web/app/components/workflow/nodes/loop-start/types.ts

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+import type { CommonNodeType } from '@/app/components/workflow/types'
+
+export type LoopStartNodeType = CommonNodeType