Fix workflow knowledge retrieval cache bug

🐛 Fixed issue where deleted datasets appeared as blank options in workflow knowledge retrieval nodes

## Problem
- After deleting a dataset and adding a new one, workflow knowledge retrieval nodes showed both a blank option (ghost data) and the correct new dataset
- Issue was caused by stale SWR cache and improper initialization of SelectDataset component

## Root Causes
1. SelectDataset component created 'ghost' objects with only IDs but no names during initialization
2. SWR cache was not properly invalidated when datasets were deleted

## Solutions
1. **Fixed SelectDataset initialization**: Avoid creating ghost objects, properly initialize selected state after data loads
2. **Added SWR cache invalidation**: Clear all dataset-related cache when a dataset is deleted

## Files Changed
- web/app/components/app/configuration/dataset-config/select-dataset/index.tsx
- web/app/(commonLayout)/datasets/DatasetCard.tsx
- clickzetta/build-local-dify-web.sh (new build script for testing)

## Testing
✅ Verified in Docker environment: ghost options no longer appear after dataset deletion
✅ Page refresh is no longer needed to see correct state

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

web/app/(commonLayout)/datasets/DatasetCard.tsx

@@ -5,6 +5,7 @@ import { useRouter } from 'next/navigation'
 import { useCallback, useEffect, useState } from 'react'
 import { useTranslation } from 'react-i18next'
 import { RiMoreFill } from '@remixicon/react'
+import { mutate } from 'swr'
 import cn from '@/utils/classnames'
 import Confirm from '@/app/components/base/confirm'
 import { ToastContext } from '@/app/components/base/toast'
@@ -57,6 +58,14 @@ const DatasetCard = ({
   const onConfirmDelete = useCallback(async () => {
     try {
       await deleteDataset(dataset.id)
+      
+      // Clear SWR cache to prevent stale data in knowledge retrieval nodes
+      mutate(
+        key => typeof key === 'string' && key.includes('/datasets'),
+        undefined,
+        { revalidate: true }
+      )
+      
       notify({ type: 'success', message: t('dataset.datasetDeleted') })
       if (onSuccess)
         onSuccess()

web/app/components/app/configuration/dataset-config/select-dataset/index.tsx

@@ -30,7 +30,7 @@ const SelectDataSet: FC<ISelectDataSetProps> = ({
   onSelect,
 }) => {
   const { t } = useTranslation()
-  const [selected, setSelected] = React.useState<DataSet[]>(selectedIds.map(id => ({ id }) as any))
+  const [selected, setSelected] = React.useState<DataSet[]>([])
   const [loaded, setLoaded] = React.useState(false)
   const [datasets, setDataSets] = React.useState<DataSet[] | null>(null)
   const hasNoData = !datasets || datasets?.length === 0
@@ -50,19 +50,14 @@ const SelectDataSet: FC<ISelectDataSetProps> = ({
         const newList = [...(datasets || []), ...data.filter(item => item.indexing_technique || item.provider === 'external')]
         setDataSets(newList)
         setLoaded(true)
-        if (!selected.find(item => !item.name))
-          return { list: [] }
         
-        const newSelected = produce(selected, (draft) => {
-          selected.forEach((item, index) => {
-            if (!item.name) { // not fetched database
-              const newItem = newList.find(i => i.id === item.id)
-              if (newItem)
-                draft[index] = newItem
-            }
-          })
-        })
-        setSelected(newSelected)
+        // Initialize selected datasets based on selectedIds and available datasets
+        if (selected.length === 0 && selectedIds.length > 0) {
+          const validSelectedDatasets = selectedIds
+            .map(id => newList.find(item => item.id === id))
+            .filter(Boolean) as DataSet[]
+          setSelected(validSelectedDatasets)
+        }
       }
       return { list: [] }
     },