refactor: improve loading animation and debug panel styles (#24075)

web/app/components/base/chat/chat/loading-anim/index.tsx

 import type { FC } from 'react'
 import React from 'react'
 import s from './style.module.css'
+import cn from '@/utils/classnames'
 
 export type ILoadingAnimProps = {
   type: 'text' | 'avatar'
   type,
 }) => {
   return (
-    <div className={`${s['dot-flashing']} ${s[type]}`}></div>
+    <div className={cn(s['dot-flashing'], s[type])} />
   )
 }
 export default React.memo(LoadingAnim)

web/app/components/workflow/panel/debug-and-preview/index.tsx

       <div
         ref={containerRef}
         className={cn(
-          'relative flex h-full flex-col rounded-l-2xl border border-r-0 border-components-panel-border bg-components-panel-bg shadow-xl',
+          'relative flex h-full flex-col rounded-l-2xl border border-r-0 border-components-panel-border bg-chatbot-bg shadow-xl',
         )}
         style={{ width: `${panelWidth}px` }}
       >