fix: polish chat page refactor

src/pages/Chat/ChatInputArea.tsx

@@ -1,42 +0,0 @@
-import React from 'react'
-import { Lock, Search } from 'lucide-react'
-
-export interface ChatInputAreaProps {
-  disabled?: boolean
-  placeholder?: string
-  onFocusSearch?: () => void
-}
-
-function ChatInputArea({
-  disabled = true,
-  placeholder = '聊天记录',
-  onFocusSearch
-}: ChatInputAreaProps) {
-  return (
-    <div className="chat-input-area" aria-hidden={disabled ? undefined : false}>
-      <button
-        type="button"
-        className="chat-input-search-btn"
-        onClick={onFocusSearch}
-        disabled={!onFocusSearch}
-        title="搜索"
-      >
-        <Search size={16} />
-      </button>
-      <div className="chat-input-shell">
-        <Lock size={15} />
-        <span>{placeholder}</span>
-      </div>
-    </div>
-  )
-}
-
-function areEqual(prev: ChatInputAreaProps, next: ChatInputAreaProps) {
-  return (
-    prev.disabled === next.disabled &&
-    prev.placeholder === next.placeholder &&
-    prev.onFocusSearch === next.onFocusSearch
-  )
-}
-
-export default React.memo(ChatInputArea, areEqual)