Implement CSS theme tokens behind feature flag (#36861)

app/javascript/mastodon/features/ui/components/bundle_column_error.jsx

@@ -98,7 +98,7 @@ class BundleColumnError extends PureComponent {
             <div className='error-column__message__actions'>
               {errorType === 'network' && <Button onClick={this.handleRetry}><FormattedMessage id='bundle_column_error.retry' defaultMessage='Try again' /></Button>}
               {errorType === 'error' && <CopyButton value={stacktrace}><FormattedMessage id='bundle_column_error.copy_stacktrace' defaultMessage='Copy error report' /></CopyButton>}
-              <Link to='/' className={classNames('button', { 'button-tertiary': errorType !== 'routing' })}><FormattedMessage id='bundle_column_error.return' defaultMessage='Go back home' /></Link>
+              <Link to='/' className={classNames('button', { 'button-secondary': errorType !== 'routing' })}><FormattedMessage id='bundle_column_error.return' defaultMessage='Go back home' /></Link>
             </div>
           </div>
         </div>

app/javascript/mastodon/features/ui/components/modal_placeholder.tsx

@@ -46,7 +46,7 @@ export const ModalPlaceholder: React.FC<{
                   defaultMessage='Try again'
                 />
               </Button>
-              <Button onClick={handleClose} className='button button-tertiary'>
+              <Button onClick={handleClose} className='button button-secondary'>
                 <FormattedMessage
                   id='bundle_modal_error.close'
                   defaultMessage='Close'

app/javascript/mastodon/features/ui/components/navigation_bar.tsx

@@ -104,7 +104,7 @@ const LoginOrSignUp: React.FC = () => {
         <a
           href={sso_redirect}
           data-method='post'
-          className='button button--block button-tertiary'
+          className='button button--block button-secondary'
         >
           <FormattedMessage
             id='sign_in_banner.sso_redirect'
@@ -143,7 +143,7 @@ const LoginOrSignUp: React.FC = () => {
     return (
       <div className='ui__navigation-bar__sign-up'>
         {signupButton}
-        <a href='/auth/sign_in' className='button button-tertiary'>
+        <a href='/auth/sign_in' className='button button-secondary'>
           <FormattedMessage
             id='sign_in_banner.sign_in'
             defaultMessage='Login'