Feat: add index bar to select tool panel of workflow (#6066)

Co-authored-by: crazywoola <100913391+crazywoola@users.noreply.github.com>

web/app/components/workflow/block-selector/index-bar.tsx

@@ -0,0 +1,54 @@
+import { pinyin } from 'pinyin-pro'
+
+export const groupItems = (items, getFirstChar) => {
+  const groups = items.reduce((acc, item) => {
+    const firstChar = getFirstChar(item)
+    if (!firstChar || firstChar.length === 0)
+      return acc
+
+    let letter
+
+    // transform Chinese to pinyin
+    if (/[\u4E00-\u9FA5]/.test(firstChar))
+      letter = pinyin(firstChar, { pattern: 'first', toneType: 'none' })[0].toUpperCase()
+    else
+      letter = firstChar.toUpperCase()
+
+    if (!/[A-Z]/.test(letter))
+      letter = '#'
+
+    if (!acc[letter])
+      acc[letter] = []
+
+    acc[letter].push(item)
+    return acc
+  }, {})
+
+  const letters = Object.keys(groups).sort()
+  // move '#' to the end
+  const hashIndex = letters.indexOf('#')
+  if (hashIndex !== -1) {
+    letters.splice(hashIndex, 1)
+    letters.push('#')
+  }
+  return { letters, groups }
+}
+
+const IndexBar = ({ letters, itemRefs }) => {
+  const handleIndexClick = (letter) => {
+    const element = itemRefs.current[letter]
+    if (element)
+      element.scrollIntoView({ behavior: 'smooth' })
+  }
+  return (
+    <div className="index-bar fixed right-4 top-36 flex flex-col items-center text-xs font-medium text-gray-500">
+      {letters.map(letter => (
+        <div className="hover:text-gray-900 cursor-pointer" key={letter} onClick={() => handleIndexClick(letter)}>
+          {letter}
+        </div>
+      ))}
+    </div>
+  )
+}
+
+export default IndexBar