feat!: add light and dark theme mixins

src/components/activity/style.scss

src/components/button/options/style.scss

src/components/button/play/style.scss

src/components/button/style.scss

src/components/card/playlist/style.scss

src/components/card/radio/style.scss

src/components/card/style.scss

src/components/input/style.scss

src/components/pagination/style.scss

src/components/pill/style.scss

src/components/popover/style.scss

src/components/textarea/style.scss

src/components/toc/style.scss

src/components/toggle/style.scss

src/styles/base/generic.scss

src/styles/colors.scss

src/styles/inc/theme.scss

vite.config.ts