Add new ESLint rule requiring explicit button types (#36738)

app/javascript/mastodon/features/navigation_panel/components/more_link.tsx

@@ -113,7 +113,7 @@ export const MoreLink: React.FC = () => {
 
   return (
     <Dropdown items={menu} placement='bottom-start'>
-      <button className='column-link column-link--transparent'>
+      <button className='column-link column-link--transparent' type='button'>
         <Icon id='' icon={MoreHorizIcon} className='column-link__icon' />
 
         <FormattedMessage id='navigation_bar.more' defaultMessage='More' />

app/javascript/mastodon/features/navigation_panel/components/sign_in_banner.tsx

@@ -71,6 +71,7 @@ export const SignInBanner: React.FC = () => {
       <button
         className='button button--block'
         onClick={openClosedRegistrationsModal}
+        type='button'
       >
         <FormattedMessage
           id='sign_in_banner.create_account'