feat(ui): expand reusable component foundation

- add Base UI and shadcn primitives for overlays, forms, navigation, feedback, and data display

- add optimized DOM ripple hooks with ref composition and integrate the behavior into interactive controls

- add AnchoredSurface SVG geometry and arrow-aware popover, dropdown, and tooltip rendering

- extend responsive breakpoint and style utilities, declare component dependencies, and remove the redundant package ESLint config

packages/ui/src/lib/utils.ts

@@ -4,3 +4,17 @@ import { twMerge } from "tailwind-merge"
 export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs))
 }
+
+export function separate<T, R>({ items, iterator, separator }: {
+  items: ReadonlyArray<T>,
+  iterator: (item: T, index: number) => R,
+  separator: (index: number) => R,
+}): R[] {
+  return items.reduce<R[]>((acc, item, index) => {
+    if (index > 0) {
+      acc.push(separator(index))
+    }
+    acc.push(iterator(item, index))
+    return acc
+  }, [])
+}