[Glitch] Implement CSS theme tokens behind feature flag

Port 284b46fee7 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/components/status/boost_button.tsx

@@ -64,6 +64,7 @@ const StandaloneBoostButton: FC<ReblogButtonProps> = ({ status, counters }) => {
       title={intl.formatMessage(meta ?? title)}
       icon='retweet'
       iconComponent={iconComponent}
+      className='status__action-bar__button'
       onClick={!disabled ? handleClick : undefined}
       counter={
         counters
@@ -195,6 +196,7 @@ const BoostOrQuoteMenu: FC<ReblogButtonProps> = ({ status, counters }) => {
           isMenuDisabled ? messages.all_disabled : messages.reblog_or_quote,
         )}
         icon='retweet'
+        className='status__action-bar__button'
         iconComponent={boostIcon}
         counter={
           counters

app/javascript/flavours/glitch/components/status_action_bar/index.jsx

@@ -376,16 +376,21 @@ class StatusActionBar extends ImmutablePureComponent {
               status={status}
               needsStatusRefresh={quickBoosting && status.get('quote_approval') === null}
               items={menu}
-              icon='ellipsis-h'
               size={18}
-              iconComponent={MoreHorizIcon}
               direction='right'
               ariaLabel={intl.formatMessage(messages.more)}
               onOpen={() => {
                 dismissQuoteHint();
                 return true;
               }}
-            />
+            >
+              <IconButton
+                className='status__action-bar__button'
+                icon='ellipsis-h'
+                iconComponent={MoreHorizIcon}
+                title={intl.formatMessage(messages.more)}
+              />
+            </Dropdown>
           )}
         </RemoveQuoteHint>