chore: `UnreadMessages` bubble tweaks (#31971)

...meteor/client/views/room/body/UnreadMessagesIndicator.tsx

apps/meteor/package.json

ee/packages/ui-theming/package.json

packages/fuselage-ui-kit/package.json

packages/gazzodown/package.json

packages/i18n/src/locales/en.i18n.json

packages/ui-avatar/package.json

packages/ui-client/package.json

packages/ui-composer/package.json

packages/ui-video-conf/package.json

packages/uikit-playground/package.json

yarn.lock