fix: fix color of ai code blocks in light mode (#21795)

packages/ui/src/components/CodeBlock/CodeBlock.tsx

@@ -98,7 +98,7 @@ export const CodeBlock = ({
             // @ts-ignore
             style={monokaiTheme}
             className={cn(
-              'code-block border border-surface p-4 w-full !my-0 bg-surface-100',
+              'code-block border border-surface p-4 w-full !my-0 !bg-surface-100',
               `${!title ? '!rounded-md' : '!rounded-t-none !rounded-b-md'}`,
               `${!showLineNumbers ? 'pl-6' : ''}`,
               className