feat: allow users to use the app icon as the answer icon (#7888)

Co-authored-by: crazywoola <427733928@qq.com>

web/app/components/base/chat/chat/answer/index.tsx

@@ -22,6 +22,7 @@ import Citation from '@/app/components/base/chat/chat/citation'
 import { EditTitle } from '@/app/components/app/annotation/edit-annotation-modal/edit-item'
 import type { Emoji } from '@/app/components/tools/types'
 import type { AppData } from '@/models/share'
+import AnswerIcon from '@/app/components/base/answer-icon'
 
 type AnswerProps = {
   item: ChatItem
@@ -89,11 +90,7 @@ const Answer: FC<AnswerProps> = ({
     <div className='flex mb-2 last:mb-0'>
       <div className='shrink-0 relative w-10 h-10'>
         {
-          answerIcon || (
-            <div className='flex items-center justify-center w-full h-full rounded-full bg-[#d5f5f6] border-[0.5px] border-black/5 text-xl'>
-              🤖
-            </div>
-          )
+          answerIcon || <AnswerIcon />
         }
         {
           responding && (