Scaffolds `twenty-new-ui`, the next-gen replacement for `twenty-ui`, on
**SCSS** Modules + **Base UI** (no Linaria).
- **Tooling**: Vite lib build, subpaths mirror twenty-ui, typed SCSS
Modules, Storybook + axe a11y, size-limit, Nx targets.
- **Theme**: single token source → nx generateTheme emits the CSS vars +
accessor; parity test asserts token-for-token match with twenty-ui.
Migrated a first `Toggle` component with its stories to allow
@charlesBochet to wire the new pixel-diff system.
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Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>