Introduce wcn()

[msaktype]

What

export wcn(), like cn() function of shadcn/ui

Why

In short: WindCtrl merges what it generates; wcn() merges what the app/user adds on top.

WindCtrl runs twMerge(clsx(...)) inside windctrl() to resolve conflicts within the styles produced by the config (base / variants / traits / dynamic / scopes).
However, in real apps you almost always need a second merge step at the component boundary:

• Components usually expose a className prop so callers can extend/override styles per usage.
• A naïve concat like ${generated} ${className} can reintroduce conflicts (e.g. p-2 vs p-4), because the external className isn’t merged.

wcn() is a tiny convenience helper (twMerge(clsx(inputs))) for that boundary merge:

• keeps the “last one wins” behavior consistent with WindCtrl’s internal merging
• avoids asking users to copy/paste their own cn() utility (common in shadcn/cva projects)
• makes examples and migration paths clearer (className={wcn(result.className, className)})