Schulungs-Vorlage auf neues App-Template umgestellt

frontend-starter/components/ui/button.tsx

@@ -1,6 +1,6 @@
 import { Button as ButtonPrimitive } from "@base-ui/react/button"
 import { cva, type VariantProps } from "class-variance-authority"
-import { cn } from "cn"
+import { cn } from "@/lib/utils"
 
 const buttonVariants = cva(
   "group/button inline-flex shrink-0 items-center justify-center rounded-4xl border border-transparent bg-clip-padding text-sm font-medium whitespace-nowrap transition-all outline-none select-none focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/30 active:not-aria-[haspopup]:translate-y-px disabled:pointer-events-none disabled:opacity-50 aria-invalid:border-destructive aria-invalid:ring-3 aria-invalid:ring-destructive/20 dark:aria-invalid:border-destructive/50 dark:aria-invalid:ring-destructive/40 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",