fix: change config string variable limit (#837)

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

web/app/components/app/configuration/config-var/config-string/index.tsx

 'use client'
-import React, { FC, } from 'react'
+import type { FC } from 'react'
+import React from 'react'
 
-export interface IConfigStringProps {
+export type IConfigStringProps = {
   value: number | undefined
   onChange: (value: number | undefined) => void
 }
 
-const MAX_LENGTH = 64
+const MAX_LENGTH = 256
 
 const ConfigString: FC<IConfigStringProps> = ({
   value,
   onChange,
 }) => {
-
   return (
     <div>
       <input
@@ -20,13 +20,8 @@ const ConfigString: FC<IConfigStringProps> = ({
         max={MAX_LENGTH}
         min={1}
         value={value || ''}
-        onChange={e => {
-          let value = parseInt(e.target.value, 10)
-          if (value > MAX_LENGTH) {
-            value = MAX_LENGTH
-          } else if (value < 1) {
-            value = 1
-          }
+        onChange={(e) => {
+          const value = Math.max(1, Math.min(MAX_LENGTH, parseInt(e.target.value))) || 1
           onChange(value)
         }}
         className="w-full px-3 text-sm leading-9 text-gray-900 border-0 rounded-lg grow h-9 bg-gray-50 focus:outline-none focus:ring-1 focus:ring-inset focus:ring-gray-200"