DS Epic: Docking Nav Menu

### **Description**

A Docking Navigation Menu component is a collapsible or expandable menu that docks to the side or bottom of an application interface, providing streamlined access to key navigation links and actions. It optimizes screen space and enhances user experience by keeping essential navigation readily accessible while minimizing clutter.

The issue names no files, tests, or entry points. Start by clarifying the intended docking behavior, supported navigation states, and acceptance criteria, then locate the relevant design-system component entry point. Done should include an agreed component scope and verified behavior, but the issue does not define how to test it.

Written by the indexing model from the issue text.