## #16846
[Demo](https://drive.google.com/file/d/1xocZDfOUbu29tPpf2J6dngy3pLACIe62/view?usp=drivesdk)
- [x] Changes file added for user-visible changes in `changes/`
- [x] Manual QA for all new/changed functionality
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **New Features**
* Added tooltips to navigation and category menu items for improved
accessibility and clarity.
* Introduced a new optional tooltip position setting, allowing tooltips
to appear on any side of the element.
* Expanded the color palette with a new light shade option.
* **Style**
* Refactored navigation and category menu styles to use centralized,
reusable mixins for a more consistent appearance.
* Updated navigation and category menu layouts for better structure and
maintainability.
* **Chores**
* Added new SCSS mixins for navigation styling, improving code
maintainability and consistency.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Co-authored-by: Jacob Shandling <jacob@fleetdm.com>
