DS Epic: Skeleton Loader

### **Description**

A Skeleton Loader component displays placeholder shapes that mimic the layout of content while it is being loaded. It provides a visual cue to users that data is being fetched, enhancing the perceived performance and user experience.

No files, tests, entry points, or acceptance criteria are named. Start by locating the design system's existing component conventions and decide where a Skeleton Loader belongs; clarify the supported placeholder shapes, layout behavior, and visual states before implementation. Done should be a documented component that provides the described loading cue and has agreed coverage for its supported usage.

Written by the indexing model from the issue text.