* Move `main#main-content.content.content-alt` into a React component (`ContentLayout`)
* Create the CIAM variant of `RegistrationConfirmEmailForm`
* `bin/run web npm run extract-translations`
* Use `CiamLayout` in the Storybook demo
* Add `SplitTestProvider` in tests
* Fix Storybook: Wrap `RegistrationConfirmEmailForm` Story in `onboarding-confirm-email`
* Refactor SCSS files:
- only imports in all.scss
- split .storybook-layout and .storybook-enabled
- extract ciam-spacing.scss
GitOrigin-RevId: f4a214a0978423a1621dd8f60bf459af7b8f877e