POC: Refactor hds side nav to hds app side nav and header

[lisbet-alvarez]

Description

Screenshots (if appropriate)

How to Test

Checklist

• [ ] I have added before and after screenshots for UI changes
• [ ] I have added JSON response output for API changes
• [ ] I have added steps to reproduce and test for bug fixes in the description
• [ ] I have commented on my code, particularly in hard-to-understand areas
• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added a11y-tests label to run a11y audit tests if needed

PCI review checklist

• [ ] I have documented a clear reason for, and description of, the change I am making.
• [ ] If applicable, I've documented a plan to revert these changes if they require more than reverting the pull request.
• [ ] If applicable, I've documented the impact of any changes to security controls. Examples of changes to security controls include using new access control methods, adding or removing logging pipelines, etc.

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Project	Deployment	Preview	Comments	Updated (UTC)
boundary-ui	Ready	Preview	Comment	Oct 25, 2025 0:03am
boundary-ui-desktop	Ready	Preview	Comment	Oct 25, 2025 0:03am