shadcn/create turns projects into shareable presets

The real win here is that shadcn is moving presets from a one-time setup artifact into something you can iterate on, share, and reapply across projects without rebuilding the whole design system.

• –Existing projects can now be converted into presets, which lowers the friction of standardizing or remixing a live codebase.
• –The beta create flow is useful for testing theme changes like colors, fonts, and icon libraries against real components before committing.
• –`shadcn apply` closes the loop by pushing preset changes back into an existing project, including theme and component updates.
• –This is especially strong for teams that want a lightweight, shareable design-system handoff instead of a heavyweight theme migration.