[Functionality] Research, design, expand, and unify `:hover` behavior across menus, links, and buttons

## Problem
At current the original source material for the Vocabulary Design system did not have fully covered or consistent `:hover` behaviors defined. As a result many items lack `:hover` behavior changes beyond the standard `cursor` pointer. This is adequate for now, but is not aesthetically ideal.

## Description
A unified approach to the `:hover` behaviors needs to be researched and documented that:
- follows Vocabulary internal cohesion
- adheres to adequate Accessibility
- improves, but does not diminish UX
- accounts for the color system of Vocabulary

This encapsulates work documented in:
- #154
- #179
- #190

## Implementation

- [x] I would be interested in implementing this feature.