chore(deps): update dependency shadcn to v4.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
shadcn (source)	4.20.1 → 4.21.0

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Release Notes

shadcn-ui/ui (shadcn)

v4.21.0

Compare Source

Minor Changes

• #​11758 c257f688cf4de7ec10cc1be84cad29cd4631182c Thanks @​shadcn! - install cn and generate export { cn } from "cn" for lib/utils on init. Registry components now import cn from the cn package.

Patch Changes

• 8720dec73f5aebed9f649ea58636f54599fdedf1 Thanks @​shadcn! - use twMerge from cn instead of tailwind-merge internally.

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